Bosch GSR 12V battery.
by sni256andr, published
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Ok, it's not a problem for me to add more cells to this design.
I used LiPos that otherwise would go to trash, so I didn't care about overcurrent and thus battery life shortening.
The currents also may depend on the rated RPMs and overall condition of the drills.
thats very nice and much nicer than my sorry excuse for a hack job I did, when i replaced the nicd batteries from a bosch I found in the recycle bin.
but 3 x 18650 batteries are not enough for the amperage the drill asks. I measured 4-5A of power and in some occasions even more. Thats more than 3C for the batteries and most 18650 batteries are not designed for this kind of treatment. I would suggest you parallel 2 or 3 18650 in order to strain less the batteries.
to your advantage is the fact that most of the times the drill is used in short bursts but even that can be too much
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The holes for the cap are 3mm, holes in the cap - about 3.5mm, => use self-tapering bolts. Cap is needed to hold main charging port (T-deans) and a bundle of balancing wires.
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