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

Data: Brand / model UltraFire 4200 Price 2.40 € Unit price 1.20 € Alternative packagings — Origin China Store Dealextreme Date of manufacture N/A Condition (age) Tested items are brand new Unit weight 33 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 measurement Nov 2012

Notes:

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:

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

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

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