This rechargeable lithium-ion battery is specially designed for Reeder S19 Max Pro S smartphones. Made with high-quality Grade A cells, it provides stable output, safe charging, and long-lasting battery life. Built-in multiple safety protections against overcharge, over-discharge, overheating and short circuit. Strictly tested before shipping to ensure reliable performance. Perfect for replacing your old, worn-out battery and restoring your phone to full power.