Rechargeable Li Ion 3.7V 800mAh Lithium Polymer Drone Battery - China Lipo Battery, Li-ion Battery | Made-in-China.com
This bubbled-out/bad top battery (3.7V 800mAh) goes to a rechargeable drone power supply. Is it possible to replace it with two (3.7V) batteries? Series or parallel? Does different mAh matter? : r/batteries