[Rclark]

I have an Akers 15,000 mAh external battery with 1 and 2 amp outlets. 2 amp is for tablets, 1 amp for phones.

When I use the 1 amp outlet to charge my phone it is an order of magnitude faster than any wall socket charger I own. I can go from deeply empty to bang out full in very rapid time. Wall outlet is very slow by comparison.

[mikeeastman]

the wall charger is probably only putting out mAhs, so it will take longer. You maybe over charging the battery with the i amp though, you should get the max recommended charging amps for that battery. Based on the charging rates for off the grid batteries the 1 amp is way to much.

[randytsuch]

the wall charger is probably only putting out mAhs, so it will take longer. You maybe over charging the battery with the i amp though, you should get the max recommended charging amps for that battery. Based on the charging rates for off the grid batteries the 1 amp is way to much.

1 amp is the USB spec.  So if a device(phone) is designed to be charged over usb, it should current limit so it doesn't damage the battery.  If this was a "raw" battery, I would agree about the current.

It could be that you wall charger doesn't put out the 1a of current you're getting from the battery, I would suspect this if cheap chargers.