You don't want that 5v thing. For a Dewalt 20v battery search eBay for D20-PD. It's basically the same thing that nanoloop suggested but wrapped up in a nice 3D printed slide-on holder. Be sure to use a fuse with it.
My assumption is that the Dewalt battery has a BMS built into it which will prevent over-discharge. Maybe someone here can confirm. Add an eBay 2 wire 30v LED voltmeter (about a buck) so you can keep an eye on the level of charge.
My assumption is that the Dewalt battery has a BMS built into it which will prevent over-discharge. Maybe someone here can confirm. Add an eBay 2 wire 30v LED voltmeter (about a buck) so you can keep an eye on the level of charge.
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BTW, that the board I mentioned in the previous post is NOT suitable for controlling / limiting the charging of the Dewalt battery as it is designed to simply open the relay once the programmed upper limit is reached. That's ok for a lead-acid battery but not a Li-ion pack.
I only suggested the eBay board as a means to limit the discharge, in this case probably to somewhere around 16v - it's up to you to program that discharge limit to the appropriate and safe value.
You should remove the battery and use a proper Dewalt charger for charging.
I only suggested the eBay board as a means to limit the discharge, in this case probably to somewhere around 16v - it's up to you to program that discharge limit to the appropriate and safe value.
You should remove the battery and use a proper Dewalt charger for charging.
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