Is your original Microsoft Surface Book 1st Gen battery not holding a charge anymore? This is a direct replacement that'll bring your tablet back to life. Specifically designed for the 1st Generation Surface Book (models 1703, 1704, 1705), this brand new battery has a 2387mAh capacity and 7.5V output, matching the OEM specs. It's a 2-cell LiPo battery in the correct silver casing, so it fits perfectly inside the tablet screen section. Important note: this battery is NOT compatible with the Surface Book 2 or later models, so double-check your device before ordering. It comes with a 12-month manufacturer warranty for peace of mind. The part numbers DAK822470K and G3HTA020H are your key identifiers. Replacing the battery yourself requires some technical skill, as you'll need to carefully open the tablet screen. If you're not comfortable, we recommend having a professional handle the installation. But once it's in, you'll enjoy longer usage times and reliable performance, just like when your Surface Book was new. No more being tethered to the charger!