I purchased a set of four UltraLast AA Green High-Power Rechargeable Batteries more than one year ago. On the package it proudly advertises "HIGH POWER" and "Lasts Up To 3 Years", so I assumed that those are pre-charged (or Low-Self-Discharge) batteries similar to Sanyo Eneloop, but with higher capacity. Well, you know what they say about 'AssUMe'...First surprise: those UltraLast Green batteries were completely discharged upon arrival. It turns out that the actual claim from UltaLast Green web site is:"Can be charged as many as 500 times, or up to three years".In other words, it means that those cells have a service life of up to three years (which sounds ridiculously short to me). It does NOT mean that they can retain charge up to three years like Sanyo eneloop.Also note that the Amazon product description says: "Rechargeable Up To 1000X". But the actual claim from UltraLast Green web site is:"One rechargeable battery can keep up to 1,000 disposable alkaline batteries out of landfills".It does NOT imply that UltraLast Green batteries can be recharged up to 1000 times like Sanyo eneloop.Another nasty surprise: those so-called 'High Power' batteries are rated for capacity of 2400mAh, lower than that of ordinary NiMH AA cells (which are typically rated between 2500-2900mAh). Worse yet, the actual measured capacity, using my old La Crosse BC-900 Battery Charger/Analyzer, is even lower. After 4-5 complete recharge/discharge cycles, only one out of four cells reached 2400mAh. Two were around 2200-2300mAh, while the last one just 2100mAh.Long-term self-discharge data were equally disappointing. After 3 months in storage, the remaining charge was just 49%. After 6 months they were completely dead. Even more disturbing news is that: after recharging those cells fully, their measured capacities have now deteriorated to around 1900-2100mAh!In contrast, the UltraLast Green 'Everyday' Precharged series is a much better product because:- It is pre-charged and ready to use right out of the package- Its capacity is rated for 2100mAh, but actual measured capacity is higher at around 2200mAh- It is able to retain at least 80% of charge after 12 months of storage- It is priced much lower than the so-called 'High-Power' seriesConclusion:The UltraLast Green 'High-Power' series is a mediocre product with below-average performance. Yet it is being sold at a premium price under deceptive marketing claims. Don't waste your time and money on it.