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Nice job! I am thinking of doing the same. Now i have tried an einhel 18v lion battery on a 18v bosch tool and works fine. The bosch connector has 3 contacts, (+),(-) and a third, but the einhell battery only has (+) and (-). I suppose the third contact is some kind of regulator, sensor, protection circuit. If I buy a lion battery with 3 contacts, and solder them respectibely, will this work and also be safe not to decharge too much or overheat? thank you