The BT51 battery is designed for Morotola cell phones also designed by Motorola. This battery can be purchased from the following retailers: Amazon, eBay, Tmart, Best Buy.
The normal battery life for this product is 36 hours. This is based on normal usage and charging and discharging the battery in the iPod in the first few uses.
Every time you run an automobile battery down, you cut the life of the battery. These batteries are not designed to be run down. They are designed to hold a charge continuously. Run the battery down three or four times and you will ruin the battery.
A torch (flashlight) battery is a dry cell, and is not designed to be recharged.
The same way you charge a car battery. The only difference in them is that the marine battery is a deep cycle battery, meaning it is designed to be run completely down without damaging the battery. Ideally you need a charger designed to charge deep cycle batteries but you can charge one with a normal battery charger.
It is called a deep cycle battery
No, a deep cycle battery is designed to be run completely down without doing harm to the battery. A normal automotive battery be it diesel or gasoline is not designed to be run flat and every time it is run flat it's life is shortened.
The primary consumer of this product is typically the target audience or demographic that the product is designed for.
An alternator is designed to keep a fully charged battery at peak level. It is not designed to charge a dead battery. Installing a new alternator on a car with a dead battery can in some cases ruin the new alternator. Fully charge the dead battery before starting the engine.
With a charger specifically designed to charge this battery.
A loose battery cable can cause the battery to not be able to receive a charge from the alternator. This can run the battery down. Will it kill the battery? Yes and no. Draining the battery once will do very little harm but it will do some. Run it down a few times and you can ruin the battery. Auto batteries are designed to be kept charged and are not designed to be run down and recharged like a deep cell marine battery or golf cart battery.
I use Battery Corrosion Guard it is a local product to the Eastern Washington area but can be found at the related links. It is a rare product that really works. Brush it on your battery terminals and the battery will wear out before it corrodes.
It is not designed by humans, it is a natural product having this characteristic.