Several variables, including the type of battery, the brand, and the store where you buy it, can affect how much it costs to replace a lawn mower battery. The price range is roughly estimated as follows: Traditional Lead-Acid Batteries. The normal price range for conventional lead-acid batteries, which are frequently used in lawn mowers, is $20 to $80. The price can change based on the quality, brand, and capacity of the battery. Maintenance-Free Batteries. A more sophisticated and long-lasting solution, maintenance-free batteries are often referred to as sealed or absorbed glass mat (AGM) batteries. Depending on the type and capacity, these batteries often have a greater price range, starting at about $50 and increasing up to $150 or more. Lithium-ion batteries. Some lawn mowers might be compatible with lithium-ion batteries because lithium-ion batteries are lighter and have a longer battery life than lead-acid batteries. Lithium-ion batteries, however, are generally more expensive. Depending on the brand, capacity, and compatibility with your particular lawn mower model, prices might range from $100 to $300 or more. It's crucial to keep in mind that these pricing ranges are only estimates, and the real cost can change depending on your region, the particular battery model needed for your mower, and any extra features or guarantees offered with the battery. To find out the exact cost of the battery you require, it is advised to check with nearby merchants, online shops, or accredited dealers.