Review on High Performance Tenergy AA 2000mAh Rechargeable NIMH Battery Pack Pre-Charged for Remote Controller, Toys, Flashlight, Mice - Low Self Discharge - 4 PCS by Linda Diaz

This product description (Tenergy Centura AA Low Self-Discharge (LSD) NiMH Batteries) contains many claims similar to the original SANYO eneloop. The manufacturer even provided some charts showing that the performance of the Tenergy Centura is almost identical to that of the Sanyo eneloop. To be honest I don't really trust Tenergy's products. But you just can't resist the current low price (30% less than eneloop). So here are my test results with my old La Crosse BC-900 charger: - Right out of the box, the average measured charge remaining was only 520mAh, or 26% of the rated "2000mAh" capacity. In comparison, the Sanyo eneloop usually comes with 75% of the rated capacity. After the first charge, the capacity of two batteries reached 1250 mAh, and the other two reached 2100 mAh. I am surprised to see this discrepancy because it has never happened with other LSD elements that I know and have tested. After the second charge, all four cells reached 2100 mAh. Subsequent charge/discharge cycles resulted in an average capacity of 2108 mAh. This is very similar to the Sanyo eneloop capacity. It will be a few more months before I can get long-term self-discharge data. For now, the Tenergy Centura appears to be working exactly as advertised - after at least two full discharge/charge cycles. So I think Tenergy Centura is a good cheap alternative to Sanyo eneloop. But for mission-critical applications, I will continue to trust eneloop to all other brands. [Except] Make sure you choose the best unit price. Currently, a 12xAA pack is even more expensive than three packs of 4 batteries when shipping costs are included. [Updated September 24, 2011] Long Term Self-Discharge Data: A pair of Tenergy Centurs AA batteries survived after 3 months of storage. 1770 mAh or 84.3% of the original capacity. This number itself looks good. But the disturbing discovery is that after two more charge/discharge cycles, the average capacity is now just 2015mAh, or 4% lower than what I measured previously. I've seen this capacity drop in the past with pre-charged cells from other manufacturers (like the Lenmar Ready-2-Go R2GAA) but never with Sanyo eneloop cells. [Updated November 27, 2011 5 months storage. The results are similar: they retained 81.0% of their original capacity, but their new average capacity dropped by 4% to just 2030mAh. 900. To my surprise, their capacity normalized between 2070-2110 mAh. Am I assuming that my previously measured lower performances were affected by a different ambient temperature? Definitely I have to change my rating back to 5 stars as I have nothing bad to say about this product.