[SML] battery packs for practicals

[George Davidson]

I have been buying bases off e-bay that fit the batteries from my cordless
tools for powering props and practical's, They look to be 3d printed and
come with tails, i added a buck/boost transformer to ensure i always get 12v


the advantage this gives me is the batteries are easily charged, swapped
and i already own them and the chargers, it was even an excuse to get some
high amperage ones, and students can figure it out really easy

George
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