If you don't plan to use your iPad for a long time (say, a few months), store it with about a 50% charge for best performance. Storing it at 100% isn't ideal, and storing it completely dead is even worse. The best advice is to charge it to 50%, then turn the iPad completely off and store it in a cool area.
Usually, it means that your phone is detecting a cable plugged in but no power is being sent to the phone battery. Or, perhaps the phone battery is rejecting the battery charge. The reasons could range anywhere from a charger problem, to a charging port problem or even a bad phone.
No matter what type of battery it is or what material it is made of, it will drain the charge even when not in use. Similarly, when not in use, Lithium-Ion batteries will drain. If you charge the battery when it is completely discharged, you will reduce its capacity.
The battery is fully charged once the current stabilizes at a low level for a few hours. There are two criteria for determining when a battery is fully charged: (1) the final current level and (2) the peak charging voltage while this current flows.
If you turn on iCloud Backups it only backs up once a day, and only when the phone is plugged in, connected to Wi-Fi and the screen is locked. So it does not put any load on the battery; it actually backs up while the phone is charging and otherwise idle, and will have no effect on battery life.
Lithium-Ion batteries suffer in extremely cold temperatures: According to Battery University, cold temperature “increases the internal resistance and diminishes the capacity” of a Li-ion battery. Specifically, they estimate that at -18 degrees Celcius a Li-ion may only deliver 50% of its capacity.
Turn Off Your iPad At Least Once Per Week If you've been experiencing iPad battery problems, it's possible a hidden software issue is the main cause of the drain. Turning your iPad off allows all of its programs to shut down naturally.
iPad with the Home button: Hold down the "Home" and "Power" buttons at the same time until the Apple logo appears on the screen. iPad without the Home button: Quickly press and release the "Volume Up" button and then repeat the operation with the "Volume Down" button.
The Meaning of iPad Showing Battery with Red Line. An iPad's red battery icon indicates that it has been a while since it was charged. Seeing this message means that your iPad's battery has run low and needs to be recharged.
A fully charged 12 volt battery should read at 12.6 volts on the multimeter. If the reading is lower than this, you'll want to charge your battery with either a battery charger or by taking your car for a drive.
The bubbling or gurgling sound is entirely normal during the charging process, especially when the battery is new because it is essential for the golf cart batteries to solidify the new lead within the batteries, commonly called curing the lead.
To charge your iPad battery, do one of the following: Connect iPad to a power outlet using the included cable and power adapter. See Accessories included with iPad. Note: Connecting iPad to a power outlet can start an iCloud backup or wireless computer syncing.