I haven't used my DJI OSMO mobile 1 in a while and it wasn't turning on. Figured I had to charge it. Charged it for hours but the light stayed blinking red. When I use Assistant 2 to upgrade the software, it updates and the light becomes green but it's not doing anything. If I remove the cable it turns off and I can't turn it on. When I connect the cable again the light goes back to blinking red. I also tried cleaning the battery connections with alcohol. Could the batterry be dead?

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