I used Energizer NiMH batts. They can be found very inexpensively at your local WalMart/Sam's Club. They just started pushing some 2300mAh batts, so that should get some more life out them. The ones I built were 1800, I believe.
I charge that pack IN the radio, which I've heard horror stories about, but I keep a watchful eye and check for heat dissipation often. I only built the external charger to have the OEM batt pack ready if I was doing some serious scanning. Other than the pack and the charger that I built, nothing else was modified. Anything that was on the radio is still on there, and no plugs were harmed in the making of the pack. ;-)
As a matter of fact, I decided to run some trial-and-error tests in the next couple days. I'm wondering if the charging circuit is crapping out or if it really is my batt pack getting weak. I charged up MY pack in the external charger and have been running the OEM pack in the radio. I'll swap the 2 around and see what happens. If it dies early, then I was right and it IS the batts (which I'm not complaining about... 1+ year is fine, I got my money's worth... I'll probably play around with the AA/Credit Card configuration)... if I get my old lifetime out of them, then it IS the charging circuit, and the warranty has expired. Not sure if I'll end up sending it out or not, but we'll worry about that when I've concluded what the issue is.
In the meantime, it's 12/25 and I have a 246t to go open up later on this afternoon! YAY!

Speaking of charging and batteries, I put (4) of those Energizer 2300's in the charger last night to pop into the 246 today!
Have a safe Christmas and an even safer New Years everyone!
