"---MIKE---" wrote in message
...
I have three "power-off" lights that are dead because the batteries have
died. They take two AA batteries which I want to replace. Which type
would be the best - Lithium, Nickel-Cadmium, or Nickel Metal Hydride?
They would be plugged in and constantly charging until the power goes
off.

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The type of battery depends on what the charger is designed to charge. You
cannot just stick any battery into it and expect it to work -- especially
lithium, as they can catch fire if charged wrongly. Each type of battery has
a different working and charging voltage requirement. Replace the batteries
with the same type the lights came with.