Laptop batteries provide power to laptops and their internal components, including disk drives, speakers, and fans. They may be used as a primary power sources or as backups when AC power is not available. Most laptop batteries are rechargeable and designed for specific laptop models. Batteries last from two to five hours on desktop replacement laptops, but because newer models are optimized for power efficiency, some batteries can last up to 16 hours.
Power meter: Choose a laptop battery with a power meter that allows you to monitor battery life. Look for one with an on-screen indicator and low-power alerts. Make sure the readings are accurate – some batteries are off by as much as 30 minutes.
Weight: Choose a lightweight laptop battery if you do a lot of mobile computing. This is usually indicated by energy density, which simply means the power output in relation to the battery size and weight. Lithium-ion batteries are usually the lightest and slimmest.
Recharge: Choose a laptop battery that reaches full recharge in minimum time. NiCd and NiMH batteries automatically recharge when connected to fixed, while Li-Ion batteries recharge only at low voltages. Look for one with an auto-shutoff feature that turns off the charger when the battery is full to prevent overcharging.
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