How is the capacity grading accuracy of VX4 charger?

The VX4 charger uses a 300mA discharge current to test battery capacity. Under the comparison test of the XTAR lab, with the same test condition, a randomly picked XTAR 1.5V AA 1200mWh battery had real capacity 1161mWh by VX4 charger,

I tested XTAR 4150mWh with VX4, the value is only 3500-3750mWh, is this normal ?

XTAR AA 1.5V 4150mWh Li-ion battery, the original cell is 3.6V rated capacity of 1150mAh; the original cell's power is: 3.6V * 1150mAh = 4140mWh; this is also the origin of our labeling 4150mWh.

I tested XTAR 4150mWh with VX4, the value is only 3500-3750mWh, is this normal ?

When converting a 3.6V primary cell battery to a 1.5V constant voltage lithium battery, there is a loss of about 10% due to the influence of the protection board and the bucking circuit; the actual tested capacity is around 3750mWh.

For 3.6/3.7V Li-ion battery, would the set of 2.5V discharge cut-off voltage cause a over-discharging?

No, it won't. According to the international testing standard IEC 61960-3 2017, the discharge cut-off voltage for 3.6/3.7V Li-ion batteries is 2.5V.

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VX4 Visible Mixer 1.5V/3.6V/3.7V Li-Ion 3.2V LiFePO4 1.2V Ni-MH Batteries Charger and Battery Capacity Tester

VX4 Visible Mixer 1.5V/3.6V/3.7V Li-Ion 3.2V LiFePO4 1.2V Ni-MH Batteries Charger and Battery Capacity Tester

Product ID: 644468718

Details

Brand
XTAR
Color
Black
Item Weight
315 Grams
Output Voltage
11 Volts (DC)
Product Dimensions
1.63"D x x

⚡3A max charging current

📊Real-time mWh & mAh capacity display

🔋Supports 1.5V/3.6V/3.7V Li-ion & LiFePO4 & Ni-MH

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€ 84.30

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power up with precision — never settle for less than full capacity!

MIX MATCH POWER - Charge up to 4 batteries simultaneously, any size or type—because your gear deserves versatility.
SAFETY MEETS SPEED - Built-in multi-protection and CVSA tech ensure safe, overheating-free charging from 0-40℃.
CHARGE SMARTER NOT HARDER - 20W PD adapter delivers rapid 3.3-hour charge for high-capacity 26650 batteries.
PRECISION CAPACITY INSIGHTS - Advanced mWh & mAh readouts reveal true battery health—ditch guesswork and avoid dead zones.
UNIVERSAL BATTERY WHISPERER - Seamlessly charges and tests multiple chemistries—Li-ion, LiFePO4, and Ni-MH—in one sleek device.

The XTAR VX4 is a cutting-edge visible mixer charger and capacity tester designed for 1.5V, 3.6V/3.7V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH batteries. Featuring a 20W PD adapter and 3A max current per slot, it rapidly charges batteries while providing real-time mWh and mAh capacity readings on an LCD screen. Its intelligent charging modes and multi-protection systems ensure safe, efficient charging and accurate capacity testing through a full charge-discharge-charge cycle. Ideal for professionals and enthusiasts who demand precise battery health insights and versatile charging for mixed battery types.

Specifications

ASIN	B0D6VS3XLY
Amperage	3 Amps
Battery Charge Time	3.3 Hours
Brand	XTAR
Built-In Media	VX4 Charger, PD2.0 Adapter, C-C cable
Color	Black
Connector Type Used on Cable	USB Type-C
Current Rating	3 Amps
Customer Reviews	4.5 out of 5 stars 112 Reviews
Input Voltage	9 Volts
Item Dimensions D x W x H	1.63"D x 5.11"W x 6.77"H
Item Weight	315 Grams
Manufacturer	ShenZhen XTAR Electronics Co., Ltd
Mfr Part Number	VX4
Model Number	XTAR VX4
Number of Ports	4
Output Voltage	11 Volts (DC)
Product Dimensions	1.63"D x 5.11"W x 6.77"H
Specification Met	CE, FCC
Warranty Description	1

Reviews

I**A

1.02.2026

D**K

19.09.2025

M**Y

30.08.2025

K**T

16.01.2026

M**D

31.07.2025

L**S

12.06.2025

J**D

18.03.2026

M**.

16.06.2025

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