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These machines always suffer with neglect and failing internal batteries. Try charging it up.
Now people use capacitive smart boosters that have no batteries, just a capacitor. The voltage in the battery is stored up in the unit over the space of about 5 minutes and then boosted back to the battery when you turn the key.
It is supposed to have a Lithium battery and they aren't supposed to drain, but my guess is that the control circuit monitors the battery and depletes it very slowly. When was it last charged? I trickle charge my boat batteries for 24 hours once a month. The same should apply for the booster.
If booster is fully charged and the vehicle battery is almost discharged it is inevitable some battery charging will take place but it is likely to be a slow and incomplete process and could shorten the life of the booster which isn't built for such work.
It is also worth noting the car alternator is also not built for charging the battery and is often incapable of doing so. The purpose of the car alternator is to keep a fully charged battery fully charged and a discharged battery can even cause damage to an alternator.
Remove all the screws in the handle and any more that hold the front and back case halves together. Gently separate enough to expose the wires going to the battery. Disconnect the negative wire first to stop any chance of tools touching the positive connection.The battery can be lifted out and replaced.
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