Верня работы одного из 3-х комплектов аккумулятора сократилось примерно на треть.

Второго-на четверть(куплены в мае-июне)-по сравнению с относительно новым
третьим и новыми комплектами Маневича.
At a 100% charge level, a typical Lithium Ion that is full most of the time at 25 degrees C(77degrees F), will irreversibly lose approximately 20% permanent total capacity per yearThis capacity begins from the time it was manufactured, and occurs even when the rechargeable lithium ion battery is unused..
This phenomenon is called "aging of lithium ion" rechargeable cells and is an issue that is often ignored entirely. Apparently, the lithium ion cell capacity loss manifests itself in increased lithium ion cell internal resistance caused via internal oxidation "rusting" of the the lithium ion rechargeable cell and is unfortunately unavoidable.
Eventually, this lithium ion rechargeable cell resistance reaches a point where the lithium ion pack can no longer deliver the stored energy although the battery may still have ample charge. Unfortunately there are no remedies to restore a lithium ion rechargeable cell once it is worn out.