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Just put one of these on my son's Nytro and noticed the oil light comes on after starting. Checked the cranking voltage indoors and it's really low when cranking (under 9V) which appears to be the culprit with the oil light as it only does it with the small battery. Recharged and tested the battery which tests fine and leave it outside. At about -17C it won't even start I have a YTZ10 for mine as I have a couple of electronics on board. Wondering if anyone else has had issues with the small battery, the sled is brand new so maybe the motor is a little tight yet but it even has lowered compression. I keep hearing how lot's of people are running these and find it hard to believe no one is having problems.