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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🔌 Power Up Your Life with Precision!

SAFETY FIRST - Built-in protections ensure safe charging for all battery types.
EFFICIENCY REDEFINED - Maximize battery life with intelligent charging strategies.
REAL TIME MONITORING - Stay informed with an LCD screen displaying charging status.
MIXED BATTERY CHARGING - Seamlessly charge multiple battery types with one device.
SMART CHARGING EXPERIENCE - Rapidly charge your batteries with cutting-edge technology.

The XTAR VX4 is a versatile battery charger and capacity tester designed for various battery types, including 1.5V Li-ion, 3.6/3.7V Li-ion, and 1.2V Ni-MH. It features a user-friendly LCD screen for real-time monitoring, a powerful 20W PD adapter for fast charging, and advanced safety mechanisms to protect your batteries. With its intelligent charging strategies, the VX4 ensures optimal performance and longevity for your batteries.