Something to consider:
The voltage of a wall-wart charger (the kind that are usually included with phones today) is set to charge ONE 4.7v Lithium cell providing no more than 1amp for charging purposes - they arent really designed to handle MORE than charging duty, like for instance, to leave the phone on while charging! This 1amp charger should charge that battery fully in 4 to 5 hours, if you start at battery level 5% to 10% power left, which most people try not to do.
-- You CAN leave a phone on while charging, but as MOST phones can only be used through power terminals from the battery (bypassing the battery in order to use the charger as a power supply AS WELL AS letting it charge the battery independantly - which would be a good thing, but no one I know of does it yet) , you are just slowing down the full charge time - and you will actually cause the reverse gain if you are using the device as a WAP or you are watching Hulu via Wifi for too long!
A 2amp or 3amp charger would be needed to charge a 2 or 3 cell (seen in most extended batteries like from NoLemon, Orion(?), Meguh(?), etc the ones that give 3800, 6500, 8500 and 10000mah) in about 4 to 5 hours. Charging larger capacity batteries on a 1amp charger will take 1.5 to 2 times longer to fully charge (from 2% to 5% or 1% to 3% power left - re-calibrated by the phone, of course).
So, if your looking for quicker charge times (WHEN USING EXTENDED batteries), go higher in amperage - a 2-cell Lithium CAN use near 2 amps to charge, .but WILL NEVER get that much from a lesser charger, and a lesser charger WILL NEVER put out more than its stated output ( a LOT of confusion out there in many forums about such!). A 2 or 3amp charger CAN be used to charge a standard battery, that standard single-cell Lithium WILL NEVER require nor ask for more than 1amp to fully charge, nor will a charger put out more than WHAT the battery Requires. However,m batteries DO tell higher amerage chargers what type of battery they are, and how many cells are in a pack, BUT your CHARGER must be AWARE of this - some chargers are NOT automatically senstive to cell count or amperage requirements and must be "programmed", usually through switching mechanisms via software or panel-mounted switches.
One important thing to also remember is that cell/smart phones DO NOT EVER regulate charging, not in any way. CHARGERS do ALL regulating, and BATTERY CIRCUITS either ALLOW or DISALLOW charging, according to safety settings of over-charging or under-performing in output.
BatteryUniveristy.com explains the latter subject in great detail,, if you need that.
It does charge my Nexus 7. Apparently, not all Qi charger work with all Qi enabled phones.
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