Review on 🔋 NinjaBatt Pro Battery for Asus A41-X550A A41-X550 R510C X550C X550L X550J R510L X550CA X552E X550V K550L F550V X550A P550C X550EA X550D R510 X550VX F550C - High-Performance [4 Cells/2600mAh/38Wh] by Ryan Brady

Works perfectly. Apparently when the batteries die, there I some kind of sensor in the battery pack that prevents charging. This new Ninja battery fits perfectly and charges immediately. It was at about 70% charge when I first installed it. I used it for an hour after charging to 100% and it still has over 2 hours remaining.Thank Ninja too for their link to professional tips for Lithium batteries. It is important to know that you should never let them go below 20% charge! Thanks Ninja!Also, delivery was very fast. Expected delivery was almost one month, I received the battery in 4 days!