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If the recharageable battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% and graduallythe charge reduces until the battery won't charge up at all. OR The batteryshows a 100% charge but when the adapter is disconnected the battery drops offto zero capacity in a very short time. If the battery drops to an unacceptablecharge level then the battery needs to be replaced.
good question. Indeed through a phone jack one an receive the ever-going current that stays on even if our power is turned off. However to remain brief, to charge a laptop battery from that outlets would be a path I've never encountered, and of-course be careful to consider hooking up to multiples if you plan to even great 1 in each hand Yikes!. if you get them out. strip ends of each cord, then I'd stick with a small..