I agree this is unlikely a charging problem, but is either a battery problem or a slow draw on the battery. To find out if it is a slow draw, I would charge the battery until fully charged, then measure the voltage daily over 3-5 days and record your readings. Then recharge the battery and TAKE IT OUT OF THE POLARIS or at least disconnect the (+) and (-) leads. Continue to measure the voltage daily and record your results. If it holds a charge when disconnected, but drains when connected, you are definitely looking at a slow draw from a system somewhere on the ATV.

You could make a list of all electrical systems, then start pulling fuses or disconnecting one by one until the drain stops, that should isolate your system for you.

LET US KNOW!!

Tom
Bryson City, NC