Alternative power source for power-tool enhancement design project?
I'm a Design student in London currently researching power-tools.
I've made this really crude prototype of a system that looks at enhancing the vibration of a power-drill by vibrating the user as they pull the trigger on the power-drill.
It consists of a 12v 55AH car battery running through a 300watt 12v to 230v inverter which in turn powers a cheap 135watt 230volt orbital sander. It's all mounted to a British Army paratrooper clansman radio pack frame and has a very crude wooden arm with a temp on/off toggle switch mounted inside a vitamin c bottle :-) and tapped with gaffa tape, very much bricolage....
I used what I had to hand and what was cheap, i know it's not safe (yet) but i'd like some opinions on alternative smaller and lighter power sources?
I know I could just use cordless sanders but there expensive and i need multiple units 2-3 and as this is only a small part of what I'm doing so cost is an issue.
I'm considering looking at cheap 12v battery packs from cordless drills but don't fancy using lithium and blowing myself up?
All suggestions and opinions appreciated!