Cordless drill with integrated usb-charger

zelda

Enlightened
Joined
Aug 14, 2005
Messages
277
Location
Zurich, Switzerland
I'm trying to build a cordless drill with a integrated USB Li-Ion charger (TP4056 with 1A charge current)
The Battery is a high-drain Li-Ion with 20A continuous discharge current and 2Ah capacity.

2ax9.jpg

I have everything to start but I'm asking me if its a good idea to let the charger permanent connected to the battery.
When I switch to motor off, some current goes back to the battery charger and may destroy them?

Thanks for help.
 

mvyrmnd

Flashlight Enthusiast
Joined
Sep 4, 2009
Messages
3,391
Location
Australia
I don't know, but you could easily isolate the charger with a toggle switch. Having to switch it to "charge mode" before plugging it in wouldn't be a deal breaker.
 
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