Like all batteries, lithium-ion cells are consumables that age and lose capacity over time and with usage. Keeping your device current with the latest driver and firmware updates is the best way to help preserve battery reliability and longevity. Surface devices have features to reduce battery aging. This will help minimize aging of the battery cells. When using your device, make sure the battery drains below 50 percent regularly. This will result in shorter intervals between charging and lower battery capacity. It is common for the capacity of lithium-ion cells to diminish after a certain number of charge/discharge cycles. By understanding a little about lithium-ion batteries you’ll be able to help maximize the life and longevity of the battery in your Surface device: Surface devices are engineered to maximize battery life and longevity. This makes them ideal for Surface devices where we design for the longest possible battery life in the smallest possible form factor. These batteries charge quickly, discharge deeply at a steady rate, and have high energy density that allows for small cell sizes. Lithium-ion batteries are the most common type of battery used in today’s portable devices. Surface features to optimize battery longevity

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