Capacity and self-discharge of batteries «UltraFire 4200» - detailed results

Battery photo


Brand / modelUltraFire 4200
Price2.40 €
Unit price1.20 €
Alternative packagings
Date of manufactureN/A
Condition (age)Tested items are brand new
Unit weight33 gr.
Discharge (1-hour rest)7.80 V
810 ±1% mAh (≅3.16 W·h)
Discharge (5-day rest)7.78 V
770 ±1% mAh (≅3.00 W·h)
~5% self-discharge
Date of measurementNov 2012


These cells were purchased and given for testing by rover, thanks!

Coming „from ebay“, they are packaged with a charger, which fills them up for around two hours.

Here's how they stand up against some AA-sized cells:
compared to AA

Despite the size, they are quite light - around 33 grams each - which, it seems, is an almost reliable indicator about the quality and quantity of the chemistry inside. We don't expect much from these; and indeed, the actual capacity is around 800 mAh - more than five times lower than the one stated on the label!

Test results

Test chart

Capacity test immediately after unpackaging (i.e., the factory charge):
Unpacking test

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