Most helpful critical review
56 of 57 people found the following review helpful
Typical Performance, but it doesn't match the rating
on November 27, 2009
Concise: I purchased 3 packs of these 900 mAh NiMH AAA batteries by Sony. All 12 batteries behave similarly, but none of the 12 come close to 900 mAh. The average is 690 mAh, with the minimum being 634 mAh and the maximum being 732 mAh.
Detail: For my testing, I used two battery analyzers, both Powerex MAHA MHC9000. All batteries weee used on each analyzer in turn. Before any battery usage, all batteries were put through the new battery conditioning routine, using the slowest possible charge and discharge rates (200 mAh charge, 100 mAh discharge) with the analyzer set to the batteries advertised capacity, 900 mAh. This routine took days to complete. After this, each battery was discharged (slow rate). The mAh ratings was recorded for each battery. Following this, each battery was charged (slow rate), allowed to rest for 24 hours and then discharged (slow rate). This cycle was done three times for each battery.
Results: After initial break-in and initial discharge, the batteries averaged 678 mAh, low 534 mAh, high 711 mAh. After the second discharge: average 685 mAh, low 632 mAh, high 734 mAh. After the third discharge: average 686 mAh, low 634 mAh, high 732 mAh.
Conclusion: Typical, but disappointing. These batteries range from actual capacity of 70% of advertised to 81% of advertised. In real-world usage (3 batteries used in my GPS Photo Tracker), the batteries behaved far inferior to Costco Kirkland brand AAA batteries (the really cheap ones). Said another way, my photo tracker turned itself off after less than 8 hours of use, 3 separate times.