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just want to ask is there any benefit to use 75 size battery in my car .... if you want to ask why .... then please have a look here
and if i use the optional choice
will it going to fry my car wires ...
and if its not ... what will happen to my car expensive parts like hid ballasts for example
Both are 12volts. That is the key. It will not fry anything.
The bigger one has more amp/hours. It will produce those 12V longer (assuming the same load).
Is there a benefit?
1. If you left the lights on and then realize it, you have a better chance of the larger battery still having enough charge remaining to start the car...
2. You will not 'deep cycle' a bigger battery (deep drain reduces battery life due to chemical changes) as easily as a smaller one.
3. If you upgrade the stereo system (and you should ) the larger battery will help power the sound system amplifiers through a big draw better than a smaller battery.
If you need more reasons - let us know. Suffice to say, "Just buy the bigger battery", eh?