Thanks for that info! In my limited testing so far, I did go up a fairly steep hill that took about 20 seconds from bottom to top (which was a few seconds faster than with the AGM batteries), and did not have any errors in that case. The original onboard current gauge was only showing a 30-35 amp draw, but not sure if that gauge is accurate with the lithium batteries. The LiTime gauge does show amp draw, but it was very small and hard to see as I was climbing the hill; I'll try that again one day. Most of the the use for the cart is on my property, which has some mild, but not steep hills, so hopefully this will not be a problem! I hope not, as I would rather not spend the additional $ on more batteries, but that will be be determined.