Purchase notes 1 before purchasing, please confirm whether the picture and battery back port are correct. If you are not sure whether the battery is compatible, please click here to contact customer service for purchase guidance. Don't buy wrong wrong purchase and cannot be used 2 the port on the back of the battery is different, so it is not compatible and the battery base cannot be replaced. 4 Pins dp-5c : there are 4 pins on the insert port on the back of the battery and no white screws next to it. 4 Pins hl085 : there are 4 pins on the insert port on the back of the battery and 2 white screws next to it. 3 Free shipping on all orders.This bike battery are shipped from united states & china warehouse, delivery time is 7-25 working days. 4 Batteries are special items and cannot be returned. No refunds or exchanges if you buy the wrong battery 5 please check the primary battery specification before purchasing. The battery is only suitable for 500w m026sh electric bike applicable bike model style bike model bike style bikes 4 pins dp-5c m026shul amak00019 seat tube without controller box 500w 48v 4 pins hl085 m026sh spa000045 seat tube with controller box 500w 48v product details battery type e-bike lithium battery pack applicable scope m026sh battery cell composition lithium color black rated voltage 48v rated capacity 7.8Ah 10.4Ah 12.8Ah battery power 374wh 499wh 614wh max charge voltage 54.6V discharge cut-off voltage 35.75V charge current 3a max charge current 5a stan...