i had the same exact problem with my 2001 polaris sportsman 400. It is either your voltage regulator or your stator. With your ATV running disconnect the positive terminal on your battery. IF the ATV quits instantly then its probably your stator.
Don't charge it frquently.
something is causing a drain on the battery when switch is turned off
ALTERNATOR OR THE BATTERY GROUND WIRE Have you tried checking your Alternator? I know this is why mine on my vehicle would not stay charged..
Something is on draining the battery or it has a dead cell and needs replacing.
Starter solenoid is sticking. Replace it.
Either the charging system has failed or the battery is bad.
how long do batterys work for a car?
Altenator is not charging battery!!
Dead cell in battery or something is on pulling power from the battery. Disconnect the negative battery cable overnight with the battery fully charged (12.6 volts). If the battery is dead the next morning it has a dead cell and needs replacing. If however the battery is still fully charged then a light is on somewhere or a relay is stuck closed.
Dead cell in battery, loose of corroded battery connections, or the charging system on the mower engine is defective.
The battery is bad or the alternator is not putting out the correct voltage and is bad.
Sulfation can happen when battery is not fully charged and remains discharged