Have a look at the battery status while it is charging - see if it says Charging (AC) or Charging (USB). If it says USB then it will have switched to a lower power draw mode and take a lot longer to charge. If it does show USB then this might indicate a problem with the charger or the USB cable. Try pushing the USB cable fully into the charger. Try swapping the USB cable to a different one , otherwise a problem charger.
Therefore a 15amp socket can supply a maximum of 1.8Kw at 120v (wihout going into power factors etc).. The input of a charger is about 0.2A or about 24W at 120v. So you could have about 75 wall chargers plugged into the one socket (barring power loss through the multi sockets) before you might find problems sharing power. This little draw is unlikely to be affected by any regular devices you are sharing the power socket with. You'd already be risking your house burning down before it affected the charger.
As for "don't have it plugged in with other stuff as the power is shared". The Amp rating of a power supply, cable, multi-socket, wall socket etc are just the maximum ratings that these devices can safely supply. If you try to request more power than that then they will usually heat up and possibly burn out.
Therefore a 15amp socket can supply a maximum of 1.8Kw at 120v (wihout going into power factors etc).. The input of a charger is about 0.2A or about 24W at 120v. So you could have about 75 wall chargers plugged into the one socket (barring power loss through the multi sockets) before you might find problems sharing power. This little draw is unlikely to be affected by any regular devices you are sharing the power socket with. You'd already be risking your house burning down before it affected the charger.
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