OK, I rode the ES2 with the extra battery for about 25km on different roads, straight, uphills and downhills, the max speed was 31kmh, cruise control was functioning normally on various speeds, braking was normal. However, when the battery charge reached below 50% the speed was not stable and it was hesitating, like it was trying to apply short brakes or reduce the speed occasionally, was sort of annoying.
I will recharge the batteries to full again and try one more time to see if the issue is still there.
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