Bring Your Surface Pro 1/2 Back to Life: P21GU9 Premium Replacement Battery Is your Microsoft Surface Pro 1 (model 1514) or Surface Pro 2 (model 1601) plagued by sudden power-offs during meetings, fast battery drain while taking notes with the stylus, or failure to hold a charge through a full workday? This 100% brand-new P21GU9 Li-Polymer replacement battery is tailor-made to match the original power specs of your 10.6-inch 2-in-1 tablet. It perfectly revives your devices performance, whether youre editing documents, attending online classes, or streaming videos. Every battery undergoes strict pre-shipment charge-discharge testing to ensure stable performance.