This HTC BM23100 Internal Battery 35H00199-12M is an internal battery specially made for your HTC Windows Phone 8X. The 1800 Li-Ion Polymer battery will deliver the best performance for your HTC Windows Phone 8X. Enjoy talk times and stand by times just like when you got your phone. This internal battery is a great replacement, incase your HTC Windows Phone 8X is having trouble powering up or keeping a good charge. Important Note: We recommend an authorized repair center completes the installation, the battery is an internal type. We do not provide any installation assistance, warranty, or accept returns on this item. Before installation, please consult with your device's manufacturer in regards to any issues related to the warranty of the device. OEM HTC Part Numbers: BM23100 / 35H00199-12M / 35H0019912MCompatible with the HTC Windows Phone 8X phone model. Cables & Etc, LLC is the owner of the trademark C&E. This UPC is trademarked under C&E. Any violation will be reported to Amazon without any prior warning.