If the battery is old, say three years, it may be worn out. Fully discharging batteries or using them beyond where they have noticeable loss of power results in reverse charging the weakest cell which then often shorts rendering the battery un-rechargeable.
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If the battery is old, say three years, it may be worn out. Fully discharging batteries or using them beyond where they have noticeable loss of power results in reverse charging the weakest cell which then often shorts rendering the battery un-rechargeable.