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Hi i am new to the utv world (i am an automotive thech in off-road performance on jeep and Dodge for 13 years that have decided to retire from the 4x4 world and play whit something smaller ) The big problems i see whit the hisun is a cooling fan issue that eat so much amp that the generator cant keep the batteries charge (i have the dual cooling system and whit 2 fans on it goes under 10 volts if you run at low speed that cause after few hours to run out of batteries. Batteries not have the amp to hold enough charge to push the fan at the best performance and generator cannot hold the OEM fan when the batteries is not enough charged (overheat issue was caused by that) an other problem that is a batteries issue was the starter itself it need more amp than the batteries have so the slow crancking is caused by that. When i worked on cf moto and odess utv i noticed that cf moto add the same starting issues due to the same problem too small batteries but odess use a honda civic batteries to make it work just fine (fans runs no more than 2 minutes instead of cf moto and hisun that the fans runs mostly all of the time) so i know that the batteries is a 12 volt u1 or u11 batteries so if i want to put a 1095cca batteries or a yellow top optima batteries on a custom case does the elictrical system will be able to handle a batteries that have 300-400% more ca than the small batteries or not (i know that the light will be more brighter i already replace the flasher/stop bulb factory instaled for a full l.e.d. bulb and socket hehe ). I know some people have done that on old 6 volt system atv whit no problem at all but i just want to make sure i will not frie the whole electrical system whit a bigger batteries hehe i will place some maxi fuse on the main relais and fuse system but not on the starter