ORIGINAL: Stick Jammer
How does the nicad not throw too many volts into the plug and burn it out like mine does?
A single Ni-Cad or NiMH cell is only 1.2 volts no matter what the mah rating is. A single alkaline cell is 1.5 volts which is still OK.
I was screwing around in the shop, waiting for paint to dry, and I wired a glow plug to a fully charged AA sized 1000 mAh NiCd and started a timer. 28 minutes later, the plug still glowed enough to see it, and the battery was at 1.22V. They'll probably keep a plug hot longer than we'd trust them to.