Hi guys! On the first week of charging, it would take me about 4-4.5 hours to fully charge (which is its normal charge time). Not sure why some of you are taking way much more than that. 5-7 hours or more would just be ridiculous. What I've done basically is the following which have helped the battery charge a whole lot faster. It only takes me about 2.5 - 3 hours now which is pretty siginificant.
1. I turn off the WI-FI, Data, GPS and location settings and make sure there are no heavy processes running. It is common knowledge that it is best not to use a device while it is charging as using it would only eat up more power than it is actually absorbing so at least turn off the running apps that you know are extreme "battery hoggers" e.g. WIFI connectivity and GPS/Location Services). This is especially true for mobile phones.
2. Alternatively, you can also turn off the phone while you are charging it as this will definitely make sure that nothing is running while the charging is in effect.
3. I charge the phone doing "full cycle charge" (phone should be below 20% before I charge it and let it go all the way up to 100%. (It is consistently advised that full cycle charges be done at least once a month.)
Regarding the idea of leaving the phone charging overnight, The safety and reliability (as to whether it will not damage your battery and/pr charger) of that would still remain questionable.
I basically followed these practices after the first 2 times I charged the phone since buying it. Since then, I've noticed that the charging time has improved. Like I said, it now takes me about 2.5 - 3 hours to fully charge which is pretty acceptable. The time for the phone to get to 80% is fast. Once it reaches 80%, the charging slows down known as "trickle charge"
Trickle charging
From Wikipedia, the free encyclopedia
Trickle charging means charging a fully charged battery under no-load at a rate equal to its self-discharge rate, thus enabling the battery to remain at its fully charged level. A battery under continuous float voltage charging is said to be under float-charging.
For lead-acid batteries under no-load float charging (such as in SLI batteries), trickle charging is achieved naturally at the end-of-charge, when the lead-acid battery takes in a trickle charge to keep itself fully charged. The trickle charging then equals the energy expended by the lead-acid battery in splitting the water in the electrolyte into hydrogen and oxygen gases. Other battery technologies, such as the lithium-ion technology, are highly intolerant to over-charging, and cannot be float-charged without an external battery management system.
Also, on the HTC website, they advised to charge the phone at least 8 hours on the initial charge. I wasn't able to do this the first time I bought the phone but I did it on my second charge.
P.S. I hated the fact that the HTC One took way too long to charge. I almost traded my phone in for the GS4 but I took the chance of hanging on to it. I tried doing some sensible charging practices as I stated above and they worked. Nonetheless, hopefully, HTC will release software and firmware updates for the phone that will address this important issue.
HTC One running on stock T-Mobile ROM. No roots.... YET
