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This determines how long your laptop lasts on a charge. It is safe to buy a higher capacity battery (e.g., upgrading from 4400mAh to 7200mAh), which acts like a larger fuel tank. Note that higher capacity often means more cells, making the battery heavier or bulkier. Where to Shop Safely

This is the most reliable way to find a match. Look for identifiers like the Dell Part Number (DPN) , HP Spare Part Number , or Lenovo FRU printed directly on your old battery. buy laptop battery

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. This determines how long your laptop lasts on a charge