An external battery pack can replace a laptop's internal battery, or extend the running time when used together with the internal battery. Popular brands include APC, Maplin, Lenmar and Tekkeon (myPower).

Notebook batteries are specific to each model. Even different models from the same brand can't share batteries. As batteries for old laptops become more scarce, users will have to start looking for alternative solutions to power their PCs.

How External Batteries Work

External batteries plug into the notebook's DC input socket, just like the notebook's own AC power supply. The notebook thinks it is getting power from its normal AC power supply unit, not realizing that it is actually a battery.

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