I bought the lead gel battery in an electronic shop for 10 euro or 12 dollar. The specs are: Nominal voltage: 12V, Rated capacity (10h rate): 1.2Ah, Size (L x W x H): 97 x 43 x 52mm, Total height: 58mm, Weight: 0.61kg (approx.).
I tested this Bosch power tool battery also with higher voltage drills and it functioned surprisingly well. Beside that you can put this battery in most battery boxes from the old pack. The charger of the 12V cordless you can continue to use. For higher voltage drills you have to change the charge adaptor by a 12 till 14V 400mA DC unstabilized one. Don't use the old network adaptor.
Step 1 — Battery
This battery operation concerns 12Volt, 14.4V and 16,8V cordless drills. First open the pack. Take out the battery cells. and disconnect the connector on the top.
Next step is to take a 15cm long speaker cable. To one side you press 2 slide connectors. The other side you solder the top connector of the old Dewalt tool battery pack. take care with the polarity. You can see the plus and the minus on top.
When the cable is done we can push the top connector back. To hold this in place we have to make a spacer from wood.
Now we have to find a way to connect the power tool battery for Makita to the old box. The best condition is when the battery fits exact in the old battery box and that this can be closed. When not there is a possibility to use tie wraps to hold all in place. An other way is to saw the box open. On the last photo's you see how a Black and Decker is hacked.
Last but not least the question; how to charge the lead gel battery? For a 12Volt drill you can use the usual charger. For drills with a higher voltage you have to use an adaptor with a 12V till 14 V unstabilized DC output. Its easy to connect the adaptor cable to the charger because there is no electronics build in.
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