I got the power bank portable charger and I have problems?

I got the power bank portable charger 2600 Mah & I charge it all night, and I charge my iphone 5 in the morning. It charges, but the portable charger over heats and stops charging my phone and I have to charge the portable charger. Can anyone help me fix this problem?

A power bank is just a fancy name for "battery". It does two basic functions exactly like a battery:
1. Charge up when connected to a power source
2. Discharge when connected to device

If it heats up, it is either poorly made or not compatible with the iPhone 5 battery specs (3.8 V, 5.45 Wh, 1,440 mAh). There's probably nothing you can do to "fix" it, other than try to not trying to fully charge the iPhone using the power bank, disconnecting it when it builds up some heat; then reconnecting it when it cools down. In theory, a 2600 mAh should be able to charge 1440 mAh around 1.5x, but heating will run up resistance (ironically creating even more heat) and reduce this value.

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