If I need battery packs fixed, I look for NiCad battery packs on Amazon, I look for the highest Milli Amp Hour rating, I make the mods to the new battery pack, use a little solder flux and solder the new batteries into place. I have 3 complete battery packs ready to go, I rebuilt 2 packs in November, plus I have the backup battery case that uses double A batteries. All battery packs are ready to go, now all I have to do is wait for nice weather.