Thingiverse
SONY Discman battery BP-2 adapter
by David_Liao
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It battery adapter can let you use Li-ion battery(10440) to replace old 4V lead acid battery
You also need order material as below:
Copper foil
Conductive gasket
You can use 2 of 10440 battery (3.7~4.2v in parallel)
You also need order material as below:
Copper foil
Conductive gasket
You can use 2 of 10440 battery (3.7~4.2v in parallel)
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