▶ Premium quality battery. 0 cycle brand new battery 【Self-Investigation】The battery needs to be replaced if your phone is▶ suddenly switch off▶ the battery needs to be charged more frequently than before▶ can't charge▶ Phone rebooting on low battery percentage▶ Battery percentage jumps Why after changing the part but the problem still exist? It might be▶ U2 ic, if very rapid battery drain▶ U2 ic, if can't charge on a dead battery, but can charge a partially charged battery▶ U2 ic, if not charging, doesn’t respond to charge or won't go above 1% Friendly Reminder】▶ Special skill and techniques required for proper installation.▶ No installation instructions will be provided. This is not an easy job for someone who has no experience at all▶ Strongly recommend looking for PROFESSIONAL for replacement. We will not hold responsible for any damages to your mobile phone that may cause during the replacement process▶ You might need to calibrate your battery to get accurate battery health/condition. Calibrating the battery is pretty simple, but takes a bit of patience. Just drain the battery until your phone completely dies, and then charge it all the way up to 100% without interruption. ▶ Only use glue/sticker/double tape that specific for the mobile phone spare part only. Do not use UHU glue, super glue, gum gajah and etc. We won't proceed for any warranty / refund if you use the wrong glue