In answer to the initial thread - it would be far simpler to change the battery connection lead for a new one with longer wires (easily obtained) than to do the mod you desire!

Add to that the potential need to swap the battery on occasions when you forgot to plug the charge lead in overnight...

I prefer to have two sets of cells for my digicam, each set labelled so the cells don't get mixed up, and a similar system with my MP3 players - one is 'solid state', the other a CD based unit.

I've never found any of my guitars being so 'hungry' as to warrant using rechargeables... but then, I'm fortunate that I can salvage batteries from the radio mics at work - they frequently come back from hire having only been used for a few minutes, but our policy is to supply a fresh set each time they go out. We end up with boxes full of 'old' batteries that haven't been used!