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?

  • \$\begingroup\$ Is it just one cell before and after or is it a pack of cells? \$\endgroup\$ – winny Jul 9 '16 at 21:27
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    \$\begingroup\$ There is no 18650 cell in existence with a capacity of 4500 mAh. You're being lied to. \$\endgroup\$ – pericynthion Jul 9 '16 at 23:28
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    \$\begingroup\$ It'll work just fine, because there's no such thing as a 4500mAh 18650 li-ion cell and what you're seeing is a lie on the label. That cell is in all likelihood somewhere in the 2200-2600mAh range \$\endgroup\$ – brhans Jul 10 '16 at 1:54
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    \$\begingroup\$ Don't buy that battery. Best case scenario it is a decent quality 2.5-3 Ah Li/ion battery. Worst case scenario, it is around 1 Ah and fails or catches on fire after a few uses. Can you provide a link to the powerbank? \$\endgroup\$ – mkeith Jul 10 '16 at 7:08
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    \$\begingroup\$ +1 on that other people said about capacity but safety-wise, you can increase the capacity of the battery by replacing it without problems. \$\endgroup\$ – winny Jul 10 '16 at 11:23

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.

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    \$\begingroup\$ This may not work if the charging controller integrates current over time (so-called "coulomb counting") \$\endgroup\$ – nanofarad Jul 9 '16 at 21:56

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