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Batteries Plus Bulbs is your source for quality laptop batteries. Each of our laptop battery packs are made with the highest quality battery cells, from leading manufacturers. They are engineered to meet or surpass OEM specifications and keep your laptop powered while you are on-the-go. How to care for your laptop’s battery and extend its life: All notebook batteries are built to handle a certain number of charge cycles, usually somewhere around 500 full cycles — and sometimes even more. Essentially, a charge cycle equals one full discharge down to zero percent and then a recharge back up to 100 percent. A discharge down to 50 percent and then back to 100 percent would equal half a cycle. Over time, each charge cycle decreases a battery’s capacity from its design specifications, meaning that the fewer times you drain it, the longer the battery last — all other things being equal.