Yes, its maintenence free. i havent had to charge it once even thought im overloading it with those truck horns that i got

And, i've had it for a good 7 or 8 months... srry, i dont k now anything about size but i do know they had 5,7,9 sizes. Not sure which one R15 needs..Oops, thnx


. 5 or more min with just the pilots on drains the battery


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