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You have to use UPS when you replace the battery jar of a car,which reduce unnecessary troubles caused by power turn-off. Potential troubles are as follows:
1)Reset time/date on dashboard
2)Reset audio code
3)Reset throttle valve
4)Reset burglar alarm
avoid malfunctions caused by power turn-off
The task of replacing car battery easy to accompanish if you use UPS.
All car types are applicative.

using Instructions:
Firstly,you can insert 16 pin plug of UPS into car diagnostic connector,which LED light that on the left of 16pin plug will turn green. Secondly, you can clip positive and negative charges of standby battery on another port of UPS,which both of LED lights turn green.At this moment, you can replace the battery. Importantly,you need to ensure if the battery has enough power,or it can influence the task of replacing. The LED light will turn red when the battery is short of power.