I got the same issue with my e-scooter regarding hill climbing.
My machine is a stock Veloteq Commander.I'm just down the hiway in Hamilton and my nemesis is the Niagara escarpment at over 300ft high.Think I'm gonna beef up the wiring and connections also, that was something I was thiking about for a while but never got around to it.The reply from BCwrench confirms it for me.Had no idea that there could be THAT much difference.Brilliant work BC! Think I will go with LED's eventually also.This will obviuosly be safer,but also less load on the batteries.Waiting for good sale at Princess Auto,Canadian Tire,or where ever.
I'm getting my controller replaced,just ordering it now.OEM controller limited to 12A.Going with Infineon Lyen version.Reasons are;
1) Reasonable price
2)Three speed mode (granny speed,road legal speed for Ontario,Balls out mode for offroad and hill climbing)
3)User programmable interface to change specs(get the most out of OEM motor since I believe more than just limiter used to detune for legal compliance)
4)Uses 4110 mosfets for better amperage and more robust and should run cooler.
5)Lead for electronic speedometer which my OEM scooter employs
6)Powerful and robust enough for future motor upgrading.
7)Capable of Reverse and Regen Braking,motor design permiting
Really good reviews from other ES members and also other forums.
9)Kelly controllers are Cadillac but a whole lot more coin (not worth the expense at this point with the Velotech)
I'm not going to replace my 48v 20AH SLA's until they're exhausted....I mean what's the point,no one would want them.They would just lay around.Another way to increase top speed and hill climbing ability is to add another 12v of battery power to make it 60v.That's a 20% increase tthat SHOULD be handled by the lights and DC to DC circuitry.While on the subject of batteries,I'm suprised that you have 2 batteries in parallel with one at 20AH and the other at 16AH.I thought they should be matched for proper charging and recharging.But I could be wrong.I had figured on possibly going dual drive or just replacing the OEM drive, but I'll hold off until I evaluate the performance with the new conroller and rewiring.Who knows how far I can push the OEM geared BDLC before cooking it.