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.
- 18V Cordless Drill Battery
- 18V Cordless Drill Slow Charger
- Car Cigarette Socket
- USB Car Power Adaptor
- Torx Screwdriver
- Soldering Iron
- Handy helper (to hold the board)
This guide shows you how i did it.
Step 1: Dis Assembly
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.
Step 2: Swapping IN and Out
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.
Step 3: Attach Car Cigarette Socket
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.