Charge car battery using laptop charger

Preamble

Well, not quite. However, by building a little black box you can use a 12 V mains adapter to charge a car battery

Links

From this answer to Can I use my 19.5V laptop charger to charge a dead 12V car battery?

To charge a lead-acid battery with a laptop power adapter you will need a DC-DC converter with the proper programming to do a 3 stage (constant current-constant voltage-constant float voltage) charge.

From DIY Lead Acid Battery Charger

Where

R1 = (Vout/2.77 – 1) * R2

R3 = 0.45 / I

Note: Vin ≥ Vout + 2

The circuit above is taken from the L200C datasheet:

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