Quote:
Originally Posted by burnafterreading
I guess the question would be: why would the battery be removed when on AC power??? And would the user need to insert the battery before removing from AC power? Seems needlessly convoluted...
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A lot of people recommend removing the battery if running a laptop on AC power for a while. The reasons given are to prevent overcharging and to keep the battery cool. The first is invalid but the latter has some sense. Heat makes Li-Ion batteries age faster which means the available capacity reduces faster. And if you store the battery correctly, the ageing is slowed and the overall life of the battery is extended. Personally, I don't see the point as I think the advantage of having the battery in the laptop far outweighs any extension to the life of the battery.
The same would apply to the other devices such as tablets, ereaders and phones. But, from what I have seen, most are designed in a way that removing the battery is difficult making this impractical. Plus, for most users, being able to disconnect without thinking about it is a big plus.
As to a use, I have seen a few business with a tablet of some sort used as a display or customer interface. In each case, a battery isn't needed as they are plugged in all the time. Yes, the battery is a UPS, but none of the systems they talked to were protected, so keeping the tablet running isn't needed. Removing the battery might make some sense for these installations.
But, the OP isn't interested in this or removing the battery. I think he is really wanting to know if there are devices that if plugged in for a longer time won't cause wear on the battery. Personally, I think the answer is all devices do this, but maybe some are designed differently.