When a battery made of several cells connected in series is deeply discharged.

A battery can make an electric field inside a conductor.

You gently overcharge the batteries to make sure that the weakest cells are brought up to full charge.

Their tidy batteries make them safe to bring into the house without having to worry about gasoline odors.

There's really nothing that moves, no batteries to make it go.

Lighter batteries make the ecar system far more efficient and lower overall costs.

The batteries in the picture probably made that fairly obvious.

The battery made its first move from under the seat to under the hood, where it stayed warmer and was more accessible.

Here are a couple of things to try: If you use more batteries make sure they are connected in series, not in parallel.

The type of speaker is the main differentiator, with mains or battery also making a significant difference.