This is a custom Maxamp 52v replacement pack utilizing Sanyo NCR18650GA cells and a smart bluetooth bms that you can view on your phone. The connectors wll be what comes stock with the D4 (dual XT60 and Dual XT30). This is truely a plug and play for your old worn out D4 battery. This pack is capable of delivering a constant 70a of current. Although your D4 wont pull that much current. These packs are made to order and the turnaround time is roughly 30 days from start to finish.There is $200.00 non refundable deposit if you decide to cancel the build within 48 hours of placing the order. Now you can see whats actually going on with the battery with the included smart BMS. There is a 6 month warranty against manufacturers defects. Exposure to liquid and leaving the battery on idle at a full charge will degrade the pack and isn't covered under waranty. If you plan on leaving the battery on idle you must charge or dicharge it to 60% full capacity for up to a month.