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I had all those parts sitting around so it would have been a cheap upgrade. It looks like bigger cells go on the wish list. I may still try an inside/outside cartridge with 18650's to get the voltage, capacity and extra weight that I wanted. Thanks for pointing that out and saving me the trouble.

Thanks for the warning. Is it likely to damage the detector if I try it out?

Hello all. I'm new to prospecting and first forum post. I've been lurking here for a while though. My plan is to 3D print a battery cartridge for my tdi which will allow a cordless drill 18v Li-ion battery to clip on below the control box. Inside the battery compartment will be a cheapo buck...