Electric Drill Battery Charger

I was looking for a way to charge my Smartphone while on the go, I had looked at many battery packs, but none i had found gave me the mAh rating that i was after.

One day when charging my cordless drill batteries, i thought can i modify this to charge my phone instead of charging the drill battery.

I have two chargers for my drill, one large quick charge, and one slow trickle charge.

Parts :

• 18V Cordless Drill Battery
• 18V Cordless Drill Slow Charger
• Car Cigarette Socket
• USB Car Power Adaptor

Tools

• Torx Screwdriver
• Soldering Iron
• Solder
• Handy helper (to hold the board)

This guide shows you how i did it.

Remove the 4 Torx screws.

Remember which terminal that connects to the battery is in which channel.

carefully remove the circuit board from the housing.

Due to the nature of this charger there is a protection diode preventing reverse voltage.

swap over the wire from in to out and vice verse.

Attach to the lead out of the board to a Car Cigarette Socket, The USB charger shown is a 12-24 V type and the battery is an 18V battery.

I haven't determined what the capacity of the battery is, but i have charged my phone (Moto-G) several times from flat while using it, without charging the Drill Battery.