Bosch 24V Makita CXT Battery Adapter
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Replacement for Bosch 24V battery using adapter for 2 x Makita CXT batteries
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- Tools
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- GNU General Public License v3.0
I have an old 24V Bosch SDS Drill with a failed NiCad battery. Rather than rebuilt the existing battery I designed an adapter to hold two 12V Makita CXT batteries.
The pictures show an earlier design, this design brings out all the connections from the battery to allow a 3S BMS to be fitted for each battery.
WARNING: The Makita CXT batteries do not appear to have built in battery protection, hence you will destroy them if you over discharge them. It is recommended that you fit 2 BMS as part of the build, one for each battery.
The terminals are designed to take standard 6.25mm blade crimps, although these are an interference fit they should be glued in place with either a hot glue gun or epoxy.
Wire the connections to the BMS and then wire the BMS outputs in series to give 24V. I wired this in 1.0mm^2 wire. The drill will draw 15-20A so make sure your wiring is suitably rated.
WARNING: The Makita batteries can output a significant amount of power, check your wiring carefully before connecting the batteries.
The connection labelled T appears to be a thermistor for the battery, however this has not been tested and there is little information available on the build of these batteries.
The battery holders are mounted using heat-set inserts.
Other Hardware:
- 4 x M3 x 8mm
- 6 x M3 x 16mm
- 6x M3 Hex nuts