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1. Battery capacity: Laptop battery capacity is measured in watt-hours (Wh). The higher the watt-hour value, the longer the battery will last.

2. Battery Chemistry: Most laptop batteries use lithium-ion (Li-ion) or lithium-polymer (Li-Po) technology. Li-ion batteries provide high energy density and are quite durable, while Li-Po batteries are thinner, lighter, and more flexible than Li-ion batteries.

3. Battery Life: Battery life of laptop batteries can vary depending on usage, laptop model, and battery capacity. On average, most laptop batteries last anywhere from 3 to 7 hours.

4. Battery Cells: Laptop batteries are made up of one or more cells. The number of cells in a battery can affect its capacity and overall longevity.

5. Battery Maintenance: Proper maintenance of laptop batteries can help extend their life. Some tips for maintaining your laptop battery include not overcharging your battery, calibrating your battery, keeping your laptop battery at room temperature, and using the original charger.

6. Power Saving Features: Most laptops have built-in power-saving options that can help extend battery life. These features can include reducing screen brightness, turning off Wi-Fi when not in use, and enabling power-saving mode.

7. Replacement Laptop Batteries: When the laptop battery no longer holds a charge, it may need to be replaced. It's important to ensure that you purchase a replacement battery that is exactly the same model and voltage as the original battery to avoid damage to the laptop.

8. External Laptop Battery Chargers: External laptop battery chargers are available and can be used to charge the battery outside of the laptop. These chargers can be helpful if you need to charge your laptop battery quickly or if your laptop is not charging the battery correctly.

9. Recycling Laptop Batteries: Laptop batteries are considered hazardous waste and should not be disposed of with regular trash. Instead, they should be recycled properly. Many electronic stores or various recycling centers accept laptop batteries for recycling.

10. Battery Warranty: Most laptop batteries come with a warranty. Be sure to check the warranty terms and conditions before purchasing a replacement battery, as some warranties may become void if the battery is not used, stored or charged properly.