BTI L16L4P91 BatteryPower your notebook and tablet with confidence using the BTI L16L4P91 Battery. This rechargeable, proprietarysize battery is engineered for portable devices where every watt and every gram matters. With a capacity of 5440 mAh (42 Wh) at 7. 72 V, it delivers robust, dependable energy to support work, study, and entertainment on the go. The proprietary battery size is smaller and lighter than many standard packs, preserving the devices balance and form