People usually use jumper cable or jump starter, only the latter of which worked for our car, whose battery is already very bad.
To use the jump starter:
1. park you car, open the front cover
2. put the cables onto the battery, making sure you match the red and blue electrodes
3. after charging for a while, you ignite your car.
More details:
https://www.pepboys.com/parts/batteries/diy_jumpstarting/
To use cables, you need another car to connect the red-red and black-black of the two batteries. The idea is to let the two batteries redistribute the energy they stored. The good battery will always charge the low one to move forward to equilibrium of the two.
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