dynamite needs to redesign their glow drivers to accept other sub c-cells. i bought (2) 5000mAh NiMH and (2) 4500mAh NiMH on line and they are a little too wide. the sad thing is you can't buy a replacement battery that fits. you have to buy another glow driver.
the 1st time i charged this and went to the track, something rubbed or shorted and it melted the rear right off, luckily my shop sold the same one, so they replaced it, they went to put my charged battery in it, then they broke the back off (there are only threads half way around!! and they are plastic) so the replaced yet ANOTHER one..My recommendation is to never take the back off or tighten it or anything, or BUY A BETTER PLUG STARTER!