Links to any other similar queries anyone knows of would also be helpful. I am aware that once I pull the 220V circuitry I will lose the ability to charge from mains, but I plan to get a second charger so that one is for mains and the other for charging as I've described above. Pictures of the charger (linked above) show clearly that it has 4 connections to the battery it charges. My question is this: will it be a simple matter of removing the contents (designed to handle the mains 220 volt AC input here in South Africa and convert it down to 18 volts) of the charger and connecting the positive and negative wires to the tiny inverter unit? I'm assuming that Bosch has arcane circuity in the charger to detect when the battery is fully charged and that I will destroy the charger's ability to display when the battery is fully charged if I just connect two wires where I think they need to be connected (just like with my laptop situation - I can run the laptop from DC, but cannot charge the laptop, because of Dell's specific wiring).

The charger is labelled ' al 1820 cv' and charges 12 volt to 18 volt Bosch batteries. I am thinking of using the same unit to power the charger for a Bosch cordless drill (and soon to be added, cordless jigsaw and circ saw). I have a connector between the 'inverter unit' and the laptop connection so I can change to the appropriate connections for other devices running between 12 and 24V. For the laptop connection to the unit, I cut a laptop charger connection off of an old power supply I sourced from an appliance recycling place. No big inverter (nor do I want one), just a tiny car-battery-plug-in unit that ups the volts from 12 to 18 (the unit can convert the volts to anything between 13 and 24).

I have a small solar setup at a cabin running lights and occasionally a laptop.

Dewalt 18 volt battery adapter 220 volt