EB-BS931ABY 4000mAh 3.90V Li-ion Replacement Battery for Samsung Galaxy S25 SM-931 Series 25W Charging

Description

Battery model: EB-BS931ABY
Capacity: 4000mAh (typical) / 3885mAh (rated) — 15.2Wh
Rated voltage: 3.90V
Charge limit voltage: 4.45V (standard for 3.90V lithium-ion cells)
Battery type: Li-ion (Grade A cells)
Compatible with: Samsung Galaxy S25 (SM-931U, SM-931B, SM-931N)
Package include: 1 x battery
Restore the all-day power of your Samsung Galaxy S25 with this EB-BS931ABY 4000mAh replacement battery. The Galaxy S25 is Samsung’s 2025 base flagship, featuring a 6.2-inch Dynamic AMOLED 2X display with 120Hz adaptive refresh rate, Snapdragon 8 Gen 4 processor, and an improved cooling system. This Li-ion battery is engineered to match the original power specifications, delivering 4000mAh typical capacity for seamless 5G connectivity, mobile gaming, and daily productivity. Built with multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified for global shipping safety.
Technical Deep Dive for Galaxy S25 Owners: The EB-BS931ABY battery operates at a nominal 3.90V with a 4.45V charge termination voltage — this higher charge voltage (compared to older 4.2V or 4.35V cells) allows for greater energy density within the same physical footprint. It uses low-resistance cells (typically under 50mΩ) to support the phone’s peak power draw during intensive tasks like 4K video recording or 120Hz gaming. The built-in protection circuit module (PCM) provides over‑current protection and short‑circuit cutoff. While the battery itself is not user-replaceable, this replacement unit is intended for professional installation or experienced DIY repair using appropriate tools and adhesive seals to maintain IP68 water resistance. Unlike some third-party batteries that use lower‑grade cells, this replacement maintains the original capacity and voltage curve for consistent performance.
Professional Installation & Water Resistance Note: The Galaxy S25 has a sealed IP68 water‑resistant design. Battery replacement requires heating the back glass to soften adhesive, careful prying to avoid damaging the display or rear glass, and installing new waterproof adhesive after battery replacement to restore water resistance. If not resealed properly, the device will lose its dust and water protection. We strongly recommend having this EB-BS931ABY battery installed by a professional repair service. DIY repair carries a risk of damaging the display or compromising IP68 rating. After replacement, perform a full charge cycle (drain to auto-shutoff, then charge uninterrupted to 100%) to help calibrate the battery management system.
Compatibility Note: Fits Samsung Galaxy S25 (SM-931U, SM-931B, SM-931N) only. Please note: The Galaxy S25+ uses model EB-BS936ABY, and the Galaxy S25 Ultra uses a different battery entirely. Check your current battery model in Settings > About Phone or by examining the original battery’s label before ordering. This EB-BS931ABY battery is not compatible with the S25+ or S25 Ultra, nor with any earlier Galaxy S series (S24, S23, S22, etc.).
Battery Care & Longevity Tips: For maximum lifespan, keep battery level between 20% and 80% for daily use. Avoid full discharges below 10% regularly. Do not expose the device to high temperatures (above 45°C / 113°F) — leaving the phone in a hot car will permanently degrade the battery. For best performance, use the original Samsung 25W charger (or any certified PD charger that correctly negotiates 9V/1.67A or 5V/3A). The battery supports 25W wired fast charging, 15W wireless charging, and 4.5W reverse wireless charging. If storing the device for more than 2 months, keep the battery at approximately 60% charge. Stop using immediately if the battery shows any swelling.