Acer Aspire 3820T / 4820T / 5820T Laptop Battery Replacement (11.1V 4400mAh / 48Wh 6-Cell Li-ion)

This Acer 3820T / 4820T / 5820T battery is a replacement laptop battery designed for Acer Timeline series laptops, delivering a stable 11.1V output with approximately 4400mAh (48Wh) capacity for reliable everyday use such as office work, browsing, and general computing. It is commonly compatible with Acer Aspire TimelineX models including 3820T, 4820T, and 5820T series variants, as well as related part numbers such as AS10D31, AS10D41, AS10D51, and compatible equivalents depending on the exact configuration. The 6-cell lithium-ion design ensures consistent energy delivery, long cycle life, and stable performance, making it a dependable replacement for worn-out or faulty original batteries while ensuring safe operation through built-in protection against overcharging, overheating, and short circuits.