battery, charger, powerIs it dangerous or harmful to leave a PDA on recharging unit (connected to AC power) for a long time?
I'm using HTC HD2.
No, it's not dangerous or harmful.
It is best to let the battery go empty at least once a month.
Just like people, batteries live longer if they are exercised regularly. Keeping a battery at full charge all the time actually reduces its capacity.
Response to comments: I concede that discarging is not significant when dealing with Li-Ion batteries, which we may assume a modern device as the HTC HD2 uses. Nevertheless, keeping it on external power all the time is not good. For the curious, here is some background which provides arguments to both sides:
Short discharges with subsequent recharges do not provide the periodic calibration needed to synchronize the fuel gauge with the battery's state-of-charge. A deliberate full discharge and recharge every 30 charges corrects this problem. Letting the battery run down to the cut-off point in the equipment will do this. If ignored, the fuel gauge will become increasingly less accurate. [...] The worst condition is keeping a fully charged battery at elevated temperatures, which is the case with running laptop batteries. If used on main power, the battery inside a laptop will only last for 12-18 months. [...] Removing the battery from the laptop when running on fixed power protects the battery from heat. [...] Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause by heat rather than charge / discharge patterns. [...] Consider removing the battery from a laptop when running on fixed power. ( http://www.batteryuniversity.com/parttwo-34.htm )
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