How do you recharge the key for the 745i?

To recharge the key for the BMW 745i, insert the key fob into the ignition slot and turn it to the "On" position without starting the engine. This will allow the key's battery to recharge while the car is running. If the battery is completely drained, you may need to replace it with a new one, following the manufacturer's instructions for your specific key model. Always consult your owner's manual for detailed guidance.