You can probably get a new battery for cheap, from ebay or from a shop like BTI.
Is there a DIY way to use a Carnetix unit? That sort of is a DIY procedure.
Now, if you want to build your own, it's certainly possible, but you're better off purchasing one to save yourself some money and headaches.
So is checking the output voltage on your AC power brick. You have the power brick. You look at the label on it. You determine the output voltage.
Doesn't get more DIY than that.
Try new battery like G4 15" or G4 12"
You could also manually shut down before you turn your car off. When you get some $$, buy a battery.
the bes think is that you make a sigle connexion direct from the car battery whithe a switche on the - not the + so you can deside whenyour laptop go of
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