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XTAR VC4SL

XTAR VC4SL four-slot battery charger and analyzer, front view on a white background

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VC4SL four-slot charger/analyzer, USB-C input, no adapter included

Low-voltage activation:
Revives most over-discharged batteries (XTAR's 0V activation)
Charging current:
User-selectable 3A / 2A / 1A / 0.5A / 0.25A; max 3A for a single slot
Slots:
4 independent bays for cylindrical batteries

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Package details

Model: VC4SL

The charger itself, charged via its USB-C port; add a USB-C power adapter of your own.

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing
Included essentials:
The charger itself, charged via its USB-C port; add a USB-C power adapter of your own.

Important limit: Cylindrical cells only: no 1.5V Li-ion, LiFePO4 or flat packs (those need XTAR's VX4 or other models)

Confirm condition, quantity and included accessories on the retailer’s listing.

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Specifications checked November 5, 2026. Full product details

Size and placement

Size and placement

Dimensions (L x W x H)
156 x 115.5 x 35 mm
Manufacturer specifications

Understand the whole path

See the power.
Keep the connection.

An inline meter becomes part of your USB connection. Choose the question it needs to answer.

Actual products · maker photographs

Klein Tools ET920 USB Digital Meter (USB-A and USB-C)
Klein ET920ET920
Plugable USB-C Voltage and Amperage Meter (USBC-VAMETER3, 240W EPR)
Plugable USBC-VAMETER3Maker lifestyle photograph
ChargerLAB POWER-Z KM003C USB-C Tester and PD Analyzer
POWER-Z KM003CKM003C
What needs to work through the meter?

Power ≠ data ≠ protocol analysis

Specification diagram: source to inline USB meter to device. Power, data and protocol analysis are independent capabilities.SOURCEINLINE METERDEVICEUSB-CUSB-C

⎓ Power readings: match the voltage range

↔ Data and video: separate capabilities

≋ PD profile readout: check the model

Specification diagram · conceptual paths, with no simulated measurement.

Choose a task to compare the recorded capabilities.

The detail that changes the choice

Choose what it can tell you.

Klein Tools
Klein Tools ET920 USB Digital Meter (USB-A and USB-C)

Choose a measurement

Klein ET920

ET920

An inline USB meter with USB-A and USB-C pass-through that shows voltage, current, charge, energy and calculated resistance, powered by the port it measures.

  • 20 V operating max

Check before buying. Tops out at 20 V: no USB PD EPR (28 V and up), and Klein warns that more than 24 V DC damages it

See the recorded specification
Connectors
USB-A input and output; USB-C input and output (the inputs are on short attached cables, about 4 in / 100 mm)
Voltage
3 to 20 V DC; accuracy ±1% (the manual adds '±2 Bytes')
How it connects
USB-A in to USB-A out, or USB-C in to USB-C out; the two sides can't be used at the same time, and it isn't a USB-C to USB-A adapter

Source record: ET920

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Connectors
USB-A input and output; USB-C input and output (the inputs are on short attached cables, about 4 in / 100 mm)
Voltage
3 to 20 V DC; accuracy ±1% (the manual adds '±2 Bytes')
How it connects
USB-A in to USB-A out, or USB-C in to USB-C out; the two sides can't be used at the same time, and it isn't a USB-C to USB-A adapter

Record checked 2026-11-02.

Check price on Amazon
Full product details ↗
Plugable
Plugable USB-C Voltage and Amperage Meter (USBC-VAMETER3, 240W EPR)

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Plugable USBC-VAMETER3

USBC-VAMETER3

A thumb-size inline USB-C meter that shows volts, amps, watts and the direction of current on an OLED screen while passing data, video and USB PD 3.1 EPR power up to 240 W.

  • 50 V operating max
  • 240 W PD

Check before buying. Shows volts, amps, watts and direction only: Plugable lists no energy totals, PD profile readout or e-marker test

See the recorded specification
Operating range
4.5 to 50 V, 50 mA to 6.5 A
USB PD
Passes USB PD 3.1 Extended Power Range (101 to 240 W); ports rated 48 V, 5 A, 240 W
Data and video
Passes USB data (USB 1.1 through 3.1 Gen 2, 10 Gbps) and USB-C Alternate Mode video
Connectors
USB-C plug and USB-C receptacle; works in either direction

Source record: USBC-VAMETER3

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Operating range
4.5 to 50 V, 50 mA to 6.5 A
USB PD
Passes USB PD 3.1 Extended Power Range (101 to 240 W); ports rated 48 V, 5 A, 240 W
Data and video
Passes USB data (USB 1.1 through 3.1 Gen 2, 10 Gbps) and USB-C Alternate Mode video
Connectors
USB-C plug and USB-C receptacle; works in either direction

Record checked 2026-11-02.

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Full product details ↗
ChargerLAB
ChargerLAB POWER-Z KM003C USB-C Tester and PD Analyzer

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POWER-Z KM003C

KM003C

A USB-C power tester and USB PD protocol analyzer rated to 50 V and 6 A (240 W in PD) that reads cable e-markers, lists a charger's power profiles, detects and triggers fast-charge protocols, and logs to PC software.

  • 50 V operating max
  • 240 W PD

Check before buying. No reverse-voltage protection, per ChargerLAB's manual

See the recorded specification
Voltage and current
0 to 50 V and up to 6 A continuous (240 W in USB PD)
Ports
USB-C plug (input) and USB-C receptacle (output), each supporting USB4 Gen 3 (bidirectional), plus a separate USB-C HID port for a PC or power supply (driver-free per the manual)
USB PD
Supports PD 3.2 (backward compatible), with SPR AVS added in a tester firmware update and PD 3.2 packet capture added in a PC software update; USB PD protocol analyzer with the PC software
Tests
Voltage and current, capacity and energy, e-marker readout, PDO (power profile) list, fast-charge protocol detection and triggering
Protocols (ChargerLAB's list)
PD 3.1 and 3.2, QC4+, QC5, AFC, FCP, SCP, PE, VFCP, SVOOC, UFCS and others

Source record: KM003C

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Voltage and current
0 to 50 V and up to 6 A continuous (240 W in USB PD)
Ports
USB-C plug (input) and USB-C receptacle (output), each supporting USB4 Gen 3 (bidirectional), plus a separate USB-C HID port for a PC or power supply (driver-free per the manual)
USB PD
Supports PD 3.2 (backward compatible), with SPR AVS added in a tester firmware update and PD 3.2 packet capture added in a PC software update; USB PD protocol analyzer with the PC software
Tests
Voltage and current, capacity and energy, e-marker readout, PDO (power profile) list, fast-charge protocol detection and triggering
Protocols (ChargerLAB's list)
PD 3.1 and 3.2, QC4+, QC5, AFC, FCP, SCP, PE, VFCP, SVOOC, UFCS and others

Record checked 2026-11-02.

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Full product details ↗
Compare all 11 published tools · 8 more
AVHzY
AVHzY SM-LD-00 Programmable USB Load Module for CT3

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AVHzY SM-LD-00

SM-LD-00

An optional programmable electronic load module for the AVHzY CT-3 USB meter that draws constant current or constant power from a charger, digitally adjusted from the meter itself or the PC software.

  • 100 W PD

Check before buying. Only works with the CT-3 meter; the maker states it does not support the CT-3A

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: SM-LD-00

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Voltage range
2.5-26 V
Current range
0.05-6.7 A
Power range
0-100 W
Rating conditions
The maker states these figures are tested at 25 C ambient in continuous operation
Load modes
Constant-current and constant-power, with the load value digitally adjusted from the CT-3 meter or the PC software
Compatibility
Works with the AVHzY CT-3 meter and its PC software; does not support the CT-3A
Setup
An installation guide video from the maker covers mounting the module on the CT-3

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
Digilent
Digilent Analog Discovery 3 Multi-Function Test and Measurement Device

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Digilent Analog Discovery 3

Analog Discovery 3

A USB-powered pocket instrument that combines a two-channel 14-bit oscilloscope, 16-channel logic analyzer, two-channel waveform generator and dual variable power supplies, driven by Digilent's free WaveForms software on Windows, Mac and Linux.

Check before buying. Analog bandwidth of 30+ MHz and 12 MHz AWG bandwidth require the optional BNC adapter; the flywire leads alone limit performance

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: Analog Discovery 3

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Oscilloscope
Two differential channels, 14-bit resolution, up to 125 MS/s per channel, +/-25 V input range; 30+ MHz bandwidth with the optional BNC adapter
Arbitrary waveform generator
Two channels, 14-bit resolution, up to 125 MS/s per channel, +/-5 V output range; 12 MHz bandwidth with the BNC adapter
Logic analyzer / pattern generator
16 digital I/O channels at up to 125 MS/s per channel; 3.3 V configurable inputs and outputs, 5 V tolerant inputs; SPI, I2C, UART, CAN, JTAG and more
Programmable power supplies
0.5 V to 5 V and -0.5 V to -5 V; up to 800 mA per channel with an auxiliary power source
Software instruments
Spectrum, network and impedance analyzers, voltmeter, data logger, curve tracer, protocol analyzer, static I/O and script editor in WaveForms
Software
WaveForms (free) for Windows, Mac and Linux; SDK for C, C++, Python and other languages; LabVIEW and MATLAB support
Connection
USB-C to the host computer; USB bus powered
Input filters
User-configurable hardware input filters and optional FIR software filters on oscilloscope channels
In the box
Analog Discovery 3, plastic project box, USB-C to USB-C cable, 2x15 flywire signal cable assembly, 5-pack of 6-pin male headers, 30-pin flywire labels
Part number
410-415

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
Digilent
Digilent Analog Discovery 3 Pro Bundle USB Oscilloscope and Signal Analyzer Kit

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Digilent Analog Discovery 3 Pro Bundle

Analog Discovery 3 Pro Bundle

A bundle pairing the Analog Discovery 3 USB multifunction test instrument with the BNC adapter board, a pair of x1/x10 BNC oscilloscope probes and mini grabber test clips, for higher-bandwidth bench-style measurement.

Check before buying. Digilent notes the BNC adapter board does not have differential analog (scope) inputs

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: Analog Discovery 3 Pro Bundle

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Instrument
Analog Discovery 3: two-channel 14-bit oscilloscope at up to 125 MS/s per channel (+/-25 V input range), two-channel 14-bit arbitrary waveform generator (+/-5 V output range), 16 digital channels at up to 125 MS/s
Bundle contents
Analog Discovery 3, BNC adapter board for the Analog Discovery, pair of BNC oscilloscope x1/x10 probes, mini grabber test clips (6-pack), plastic project box, USB-C to USB-C cable, 2x15 flywire signal cable assembly, 5-pack of 6-pin male headers, 30-pin flywire labels
Bandwidth
30+ MHz oscilloscope and 12 MHz waveform generator bandwidth when used with the BNC adapter (included in this bundle)
Logic analyzer / pattern generator
16 digital I/O channels at up to 125 MS/s per channel; 3.3 V configurable inputs and outputs, 5 V tolerant inputs; SPI, I2C, UART, CAN, JTAG and more
Programmable power supplies
0.5 V to 5 V and -0.5 V to -5 V; up to 800 mA per channel with an auxiliary power source
Software
WaveForms (free) for Windows, Mac and Linux; SDK for C, C++, Python and other languages; LabVIEW and MATLAB support
Part number
471-060

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
FNIRSI
FNIRSI FNB48P USB Fast Charge Tester

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FNIRSI FNB48P

FNB48P

An inline USB power tester with a 1.77-inch colour TFT-LCD and USB-A, Micro-USB and USB-C ports that measures voltage, current, power, capacity and energy and triggers full fast-charge protocols.

Check before buying. The maker publishes no voltage, current or power ranges and no accuracy figures for the FNB48P on its product page, so those key specs are left out

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: FNB48P

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Display
1.77-inch TFT-LCD colour screen with gravity-sensor auto-rotation
Measurement engine
Built-in 16-bit ADC, six-digit readouts for voltage, current, power, capacity and energy
Displayed statistics
Real-time min, max and average values
Fast-charge protocols
Auto-detect and manual trigger for QC, FCP/SCP, AFC, PD, VOOC/WARP, SuperVOOC and MTK-PE
PD debugging
Built-in PD listener captures PD communication packets; QC2.0-to-PD2.0 cross-protocol conversion test
Cable diagnostics
Reads E-Marker and DASH cable chip raw data; simulates DASH signals without the original cable
Cable resistance
Differential-pressure method measures cable internal resistance
Waveform recording
Up to 9 hours of voltage, current and D+/D- curves; high-speed sampling for ripple analysis
Energy statistics
10 groups of independent capacity and energy logging; up to 99-day runtime statistics
Battery capacity tool
On-board utility computes actual battery capacity with customizable voltage and conversion-efficiency parameters
Other functions
Real-time onboard device temperature monitoring
Interfaces
Integrated USB-A, Micro-USB and USB-C ports
Firmware
PC-upgradable firmware, per the maker
Certification
CE compliant, per the maker
Versions
FNB48P Std. and FNB48P BT (Bluetooth), sold as separate options on the maker's page
Operating environment
-5 to 40 °C, relative humidity up to 80%, per the maker
Warranty
2-year warranty and lifetime technical support from FNIRSI (maker's page)

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
FNIRSI
FNIRSI FNB58 USB Fast Charge Tester

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FNIRSI FNB58

FNB58

An inline USB tester with a 2.0-inch colour TFT display and USB-A, Micro-USB and USB-C ports that measures voltage, current, power, capacity and energy and triggers and monitors fast-charge protocols.

  • 140 W PD

Check before buying. Bottom of the voltage range is 4 V, so low-voltage 3.x V ports read below range

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: FNB58

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Display
2.0-inch full-colour TFT LCD, ultra-wide viewing angle, with gravity-sensor rotation
Monitor voltage
4 to 28 V
Monitor current
0 to 7 A
Monitor power
0 to 140 W
D+/D- voltage
0 to 3.3 V
Load equivalent internal resistance
0 to 9999.9 Ω
Capacity
0 to 9999.99 Ah, in 10 switchable groups
Energy used
0 to 9999.99 Wh
Cable resistance
0 to 9999.9 Ω, measured by the differential-pressure method
Running and record time
Up to 99 days 23:59:59
Display resolution
Up to six digits for voltage, current and power
Measurement engine
External 16-bit ADC and a PD protocol physical chip
Sampling
Low-speed waveform drawing at 2 to 100 sps; high-speed ripple drawing at up to 4 M sps
Protocol conversion
Supports QC2.0 to PD2.0 protocol conversion
Cable diagnostics
E-Marker cable chip reading, DASH cable data reading and DASH cable simulation
Other functions
Onboard temperature measurement, PD monitor, record of startup time
Interfaces
Integrated USB-A, Micro-USB and USB-C
Versions
FNB58 Std. and FNB58 BT (Bluetooth), sold as separate options on the maker's page
Operating environment
-5 to 40 °C, relative humidity up to 80%, per the maker
Warranty
2-year warranty and lifetime technical support from FNIRSI (maker's page)

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
POWER-Z (ChargerLAB)
POWER-Z (ChargerLAB) ChargerLAB POWER-Z SINK240 USB PD3.1 Trigger Board

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POWER-Z (ChargerLAB) SINK240

SINK240

A bare-PCB USB-C trigger and breakout board that requests any USB PD3.1 voltage profile (SPR and EPR up to 48 V, 240 W) or PPS mode from a PD source and presents it on Type-C and screw-down VBUS/GND terminals for test loads.

  • 240 W PD

Check before buying. A trigger/breakout board only: no display and no voltage, current or power readout; verification needs a separate meter or electronic load

See the recorded specification
Connectors
USB-C input, USB-C output, plus positive (VBUS) and negative (GND) wire-loop terminals on the output side for connecting a test load

Source record: SINK240

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Connectors
USB-C input, USB-C output, plus positive (VBUS) and negative (GND) wire-loop terminals on the output side for connecting a test load

Record checked 2026-11-05.

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Full product details ↗
SkyRC
SkyRC MC3000 Charger & Analyzer

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SkyRC MC3000

MC3000

A four-slot smart charger and analyzer for cylindrical rechargeable batteries (NiMH through lithium chemistries) that measures real capacity and internal resistance per slot, with Bluetooth app and PC control.

Check before buying. Cylindrical cells only: no flat packs, no 21700 protected cells, and nothing above a 50 W total charge budget

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: MC3000

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Slots
4 independent slots for cylindrical batteries; 44+ battery sizes supported (protected 21700 not supported)
Battery chemistries
NiMH, NiCd, NiZn, RAM, Eneloop, Lithium-Ion, LiIo4.35, LiFePO4, LTO, Na-ion
Charge current
0.05–3.00 A per slot (Li-ion max 3 A x4 slots; discharge-capable chemistries max 2 A x4, 1 A across all four)
Discharge current
0.05–2.00 A
Max charge power
50 W
Max discharge power
15 W
Battery capacity range
100–50000 mAh
Internal accuracy (calibrated with an accurate source)
Voltage within ±2 mV; current within ±2 mA; the charger's accuracy depends on the calibration source when self-calibrating
Display resolution
Voltage 0.01 V; current 0.01 A
Input power
DC 11–18 V / 4 A (AC switching adaptor included)
USB power output
DC 5 V / 2.1 A
Operation modes
Charge, Discharge, Cycle (up to 99), Refresh Analyze, Storage (Li chemistries), Break-in (NiMH/NiCd/Eneloop)
Profiles
30 user-defined operation profiles in Simple and Advanced UI modes
Display
128 x 64 pixel screen with 5 views, including Total Overview
Connectivity
Bluetooth (BLE) for the free smartphone app; PC control and data export via MC3000 Monitor software
Internal resistance
Measures per-slot battery internal resistance, for judging battery health and matching cells
Cooling
Built-in aluminum cooler with fan
Housing
UL94 V0 rated flame-retardant PC+ABS
Operating temperature
0–40 °C
Dimensions (L x W x H)
200 x 124 x 69 mm
Weight (without DC adaptor)
600 g
In the box
MC3000 charger, AC switching adaptor, AC power cord, instruction manual

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
XTAR
XTAR VC4SL 4-Slot LCD Smart Battery Charger and Analyzer

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XTAR VC4SL

VC4SL

A USB-C four-slot LCD battery charger and analyzer that charges 3.6/3.7 V Li-ion and 1.2 V Ni-MH cylindrical cells (including protected 21700), with selectable current up to 3 A, real capacity testing, internal-resistance display and storage mode.

Check before buying. Cylindrical cells only: no 1.5V Li-ion, LiFePO4 or flat packs (those need XTAR's VX4 or other models)

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: VC4SL

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Slots
4 independent bays for cylindrical batteries
Battery compatibility
3.6/3.7 V Li-ion and 1.2 V Ni-MH; 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, 32650, AAA, AA, A, SC, C (per XTAR's comparison table); protected 21700 and 20700 fit
Input
USB Type-C; QC3.0 (5V 3A / 9V 2A) or a 5V 2A USB adapter (XTAR recommends pairing with a QC3.0, PD 65W, PD 45W or PD 20W adapter for maximum speed)
Charging current
User-selectable 3A / 2A / 1A / 0.5A / 0.25A; max 3A for a single slot
Capacity test
Yes, per slot: charges fully, then measures real capacity
Internal resistance
Displayed per slot on the LCD
Storage mode
Yes, adjusts a Li-ion cell to storage voltage
Low-voltage activation
Revives most over-discharged batteries (XTAR's 0V activation)
LCD display shows
Battery type, charged volume, charging current, charging voltage, internal resistance
Protections
Multiple protections for safe charging (per XTAR's product page)
Dimensions (L x W x H)
156 x 115.5 x 35 mm
Net weight
212 g
Certifications
CE, RoHS and FCC certificates published for the VC4SL on XTAR's download page

Record checked 2026-11-05.

Check price on Amazon
Full product details ↗

The trap behind the watts

A live wattage isn’t a PD-profile list.

PDOs describe offered power profiles. E-markers describe declared cable capability. Neither is a file-transfer benchmark. Protocol analysis and long logs may need separate host software.

Maker specifications, not our own measurements. Read the exact model’s manual before use.

XTAR VC4SL 4-Slot LCD Smart Battery Charger and Analyzer

A USB-C four-slot LCD battery charger and analyzer that charges 3.6/3.7 V Li-ion and 1.2 V Ni-MH cylindrical cells (including protected 21700), with selectable current up to 3 A, real capacity testing, internal-resistance display and storage mode.

Which version should you buy?

Selected package: VC4SL four-slot charger/analyzer, USB-C input, no adapter included.

Selected package

  • VC4SL charger (standard)

    This page

    Model: VC4SL

    What differs
    The charger itself, charged via its USB-C port; add a USB-C power adapter of your own.
    Best for
    Charging and analyzing Li-ion and Ni-MH cylindrical cells.
    Check price on Amazon

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • The VC4 PLUS is the same charger sold through XTAR's own retail store; the VC4SL is the version sold through other retailers.
  • VC4S, VC4L and VC4H look similar but differ in slot current, current selection and capacity testing; the VC4SL has all three.
  • Listings bundled with a QC3.0 adapter or batteries are kits; the base listing is the charger alone.

Why people pick it

  • Charges protected 21700 and 20700 cells, which many basic four-bay chargers physically cannot fit
  • Selectable charging current from 0.25A up to 3A per slot, per XTAR's spec, so small cells can be charged gently
  • Real capacity test, per-slot internal-resistance display and storage mode give battery health data most chargers in this class don't show
  • USB-C input with QC3.0 fast charge support: one cable, and no proprietary power brick

Know before you buy

  • Cylindrical cells only: no 1.5V Li-ion, LiFePO4 or flat packs (those need XTAR's VX4 or other models)
  • No PC or app logging: readings live on the LCD only
  • Full 3A speed needs a QC3.0 or PD adapter; a plain 5V 2A adapter limits charging power

Full specifications

Slots4 independent bays for cylindrical batteries
Battery compatibility3.6/3.7 V Li-ion and 1.2 V Ni-MH; 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, 32650, AAA, AA, A, SC, C (per XTAR's comparison table); protected 21700 and 20700 fit
InputUSB Type-C; QC3.0 (5V 3A / 9V 2A) or a 5V 2A USB adapter (XTAR recommends pairing with a QC3.0, PD 65W, PD 45W or PD 20W adapter for maximum speed)
Charging currentUser-selectable 3A / 2A / 1A / 0.5A / 0.25A; max 3A for a single slot
Capacity testYes, per slot: charges fully, then measures real capacity
Internal resistanceDisplayed per slot on the LCD
Storage modeYes, adjusts a Li-ion cell to storage voltage
Low-voltage activationRevives most over-discharged batteries (XTAR's 0V activation)
LCD display showsBattery type, charged volume, charging current, charging voltage, internal resistance
ProtectionsMultiple protections for safe charging (per XTAR's product page)
Dimensions (L x W x H)156 x 115.5 x 35 mm
Net weight212 g
CertificationsCE, RoHS and FCC certificates published for the VC4SL on XTAR's download page

From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.

Alternatives to consider

AVHzY SM-LD-00 Programmable USB Load Module for CT3

AVHzY SM-LD-00

Max voltage
26 V
Max power
100 W
Specifications & conditions
Max current
6.7 A

An optional programmable electronic load module for the AVHzY CT-3 USB meter that draws constant current or constant power from a charger, digitally adjusted from the meter itself or the PC software.

Check package and model options

  • USB-C chargers
  • Electronics
  • Pros
Find on AmazonDetailsCompare
ChargerLAB POWER-Z KM003C USB-C Tester and PD Analyzer

ChargerLAB KM003C

Max voltage
50 V
Max power
240 W
Specifications & conditions
Max current
6 A
Protocols decoded
USB PD 3.2 (EPR, AVS), QC4+, QC5, AFC, FCP, SCP, PE, UFCS and more

A USB-C power tester and USB PD protocol analyzer rated to 50 V and 6 A (240 W in PD) that reads cable e-markers, lists a charger's power profiles, detects and triggers fast-charge protocols, and logs to PC software.

Check package and model options

  • USB-C chargers
  • Electronics
  • Pros
Check price on AmazonDetailsCompare