What Do Quick Charging, Short Runtime, and Hot Batteries Mean?

We had a listener write in and ask us what it means when their Gens Ace 7.2v 3000 mAh NiMh (Nickel-Metal Hydride) R/C buggy battery charges fast, has shortened runtime, and gets really hot when charging. They also asked what were the physics and chemistry behind these issues. So, in this episode of the RC Deep Dive podcast we answer those questions and give them, and should you ever need them, the next steps to solve the problem.