Tenergy Centura AA Low Self-Discharge LSD NiMH Rechargeable Batteries, 1 Card 4xAA Cheap
Best Review: Tenergy Centura AA Low Self-Discharge LSD NiMH Rechargeable Batteries, 1 Card 4xAA - The product description of this item (Tenergy Centura AA Low Self-Discharge (LSD) NiMH Rechargeable Batteries) makes many similar claims as the original SANYO eneloop. The manufacturer even provided several charts, showing performance of Tenergy Centura to be nearly identical to that of Sanyo eneloop.Frankly, I don't have much confidence in Tenergy products. But the present low price (30% less compared to eneloop) is just too hard to resist. So here are my test results, using my old La Crosse BC-900 Battery Charger:- Right out of the package, the average remaining charge measured was only 520mAh, or 26% of the rated capacity of '2000mAh'. In comparison, Sanyo eneloop typically arrives with ~75% of rated capacity.- After the first recharge, two cells reached ~1250mAh, while the other two reached ~2100mAh. I'm surprised to see this discrepancy, because it never happened to other name-brand LSD cells I have tested.- After the second recharge, all four cells reached ~2100mAh. Subsequent charge/discharge cycles gave average capacity of 2108mAh. This is very similar to the capacity of Sanyo eneloop.It will take a few more months before I can have any long-term self-discharge data. As of right now, the Tenergy Centura seems to perform as well as advertised - at least after two full discharge/recharge cycles. So I consider Tenergy Centura to be a good low-cost alternative to Sanyo eneloop. But for mission-critical applications, I will still trust eneloop over all other brands.[Aside]Make sure you shop around for the best unit-price. Presently the 12xAA package is actually more expensive than three 4-pack, after you factor in shipping cost.[Update on Sep 24, 2011]Long term self-discharge data: After 3 months in storage, a pair of Tenergy Centurs AA cells retained 1770mAh, or 84.3% of original capacity. This number by it self looks great. But a disturbing finding is that, after two more charge/discharge cycles, the average capacity is now just 2015mAh, or 4% lower than what I measured before. I have observed this kind of capacity reduction previously in off-brand precharged cells (such as Lenmar Ready-2-Go R2GAA), but never in Sanyo eneloop cells.[Update on Nov 27, 2011]Tested another pair of Centura AA cells after 5 months in storage. The results are similar: They retained 81.0% of original capacity, but their new average capacity dropped by 4% to only 2030mAh.[Update on Nov 19, 2012]I re-tested all four Tenergy Centura AA cells again on the same BC-900. To my surprise, their capacities are back to normal between 2070 and 2110mAh. I assume my previously measured lower capacities were affected by different ambient temperaure? Anyway, I have to restore my rating to 5-star since I can find no faults with this product.
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