Lithium (li) - 4.0 Volts per cell
| The Lithium Battery |
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These may seem exotic, but they are as common as, say, watches. Lithium batteries are both watch batteries and camera batteries. They have long life, but a steep dropoff at the end and no rechargable form (do NOT confuse them with Lithium Ion batteries). They are not used in many PDAs The first commercial cells were prepared in the 1970's, and primary cells can have voltages of nearly 4 V and practical energy densities exceeding 200 W hr / kg. Li cells also have very long shelf-lives, and are extensively used as small cylindrical or button cells in low-rate devices such as watches and calculators, where they can operate for several years. The long shelf-lives also make them the best choice for pacemaker batteries. |
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