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The battery cell may have some unbalance. This i planned obsolescence. Manufacturer omit a proper balance circuit in the battery so over time the unbalance get bigger en the effective useable capacity will be reduced dramatically by the safety circuitry in the battery. This does not mean the cells are bad. You need to balance the cells, but this requires opening the battery, soldering a balance connector to the individual cells and using a balance charger. No manufacturer will tell you this nor will they admit it. I just reconditioned my battery laptop myself and it's still going strong after 3 years.