Robin Sutcliffe wrote in to let us know of a battery mod he completed for the BOSS DR-220A. You can find full details and additional pics for the mod here.
"Last year I bought a DR-220A (A=analogue; the drum set samples, E=electronic) It's a beefy drum machine for it's size, I really enjoy it. With programming the accent and (closed hat cuts off open hat) , you can program some quite swingy beats, even though it's all quantized on the 16th. Also useful (to me) is the trigger in/out functions, where you can step a sequencer, arpeg, or LFO retrigger (anything that accepts a trigger) with the RIM shot in playback mode. (so not just by tapping the RIM shot pad)The battery compartment had been cleaned up after some obvious leakage and corrosion. This meant that the contacts did not hold well against the batteries themselves, and presets were not saved, even with batteries in the device! Obviously this also meant intermittent performance on battery power.
I decided to replace the 6 AA cells with a 3.7v Lipo battery, charge board, and boost circuit. The boost circuit is needed to take the 3.7v up to 6v needed for operation of the 220A."
You can find 3.7v Lipo batteries on Amazon here, and
via this auction. Be sure to get to the right size.
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