If you don't have an iPad or similar device, consider this 5v/2.4A charger for your Osmo Mobile 2.  I am not affilitaed with the seller or Amazon, but have seen many threads with frustrated customers wondering why Osmo won't charge and how to solve the problem. Don't like this model, search for iPad/similar charger. Just get one that has output of 5 volts/2 Amps.

I usually charge OM2 with my phone charger (Samsung Note FE) or using my Aukey PB power bank, you will definitely need a good cable for it.

Hi, thanks for sharing this information. Yes, that is correct. The cable should be on 5V and 2A for you to charge the Osmo Mobile 2. Thank you for the support.