I wouldn't concern yourself with the current rating on car chargers vs AC adapters. These days, the charge circuitry (and most importantly, the charge controller) is located inside the phone - the adapter simply serves as a constant voltage source. They both downconvert to 5V and let the phone do the rest. The reason this is the case is because temperature is an input to the Li-Ion charge algorithm, and this is a safety feature. Each cell phone Li-Ion battery has a temperature sensor on it, which the charge controller uses to regulate the charging process. Basically, if the battery gets too hot, it 'splodes (starts releasing hydrogen gas and then finds an ignition source). While I don't know for a fact, there has to be some sort of limit on discharge as well, because its a safety thing.
The slow charge is no doubt HTC battery engineers being allowed to be battery engineers - they'll always go for slowest charge if they can because it's easier on the battery and extends its life (as in # of charge/discharge cycles over its life, not the life of an individual charge). C/10 is a number I typically hear, although that would mean a 10hr charge. Sounds like this is probably a C/5 or some such. Course, its annoying for the rest of us (but hey, we buy less replacement batteries).
And my understanding (although not 100% sure of this) that he heat-up during nav is the mostly due to the heat from the GPS receiver. Yes it will heat up the battery, being as everything is in close proximity.
The slow charge is no doubt HTC battery engineers being allowed to be battery engineers - they'll always go for slowest charge if they can because it's easier on the battery and extends its life (as in # of charge/discharge cycles over its life, not the life of an individual charge). C/10 is a number I typically hear, although that would mean a 10hr charge. Sounds like this is probably a C/5 or some such. Course, its annoying for the rest of us (but hey, we buy less replacement batteries).
And my understanding (although not 100% sure of this) that he heat-up during nav is the mostly due to the heat from the GPS receiver. Yes it will heat up the battery, being as everything is in close proximity.
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