Your new battery's voltage must match the original exactly (e.g., 11.1V vs. 14.8V). While minor differences like 10.8V and 11.1V are often acceptable, significant mismatches can permanently "fry" your motherboard.
Some things to know when shopping for generic laptop batteries buy laptop battery
Avoid the absolute cheapest generic batteries found on open marketplaces, as they often lack essential safety circuits and provide far less capacity than advertised. Your new battery's voltage must match the original