If the battery is very dead, it can take a while for the dead battery to regain enough charge to start. If you are jump starting from a jump box and not a running vehicle, there may not be enough power available to get the charge to a level that can start the vehicle. Hook up the jumpers cable to a running vehicle and allow 10-20 minutes for the battery to gain some charge. Monitor both batteries carefully during this time and should any unusual amount of heat or if smoke starts to come from either battery, shut everything down and disconnect as quickly (and safely) as possible.
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