I recently bought a mobile phone powerbank without realising that the battery wasn't included on the kit. So now I need to buy a 18650 li-ion battery and I found one that has 4500 mAh. Can I put the 4500 mAh 18650 li-ion battery on a 2600 powerbank without damaging the device?
Yeah, should be alright I think, at least as far as the capacity difference. It'll take longer to charge (and discharge), but the cell voltage is still 3.7V, the powerbank shouldn't notice much difference.