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I think the last I recharged was a small 1.5 amp18v DeWalt, Just identify the + and - terminals and tape insulated wires between another fully charged 18 or 21v battery to form a circuit. I usually would do this outside on a table for 15 minutes keeping an eye on it. Then return the battery to the mains charger and it should resume charging to a reasonable capacity. I also suffer from !,2 NiMh  solar rechargeable failures on outdoor lighting which benefit from an annual mains charge, it is basic battery maintainance.