Originally Posted by
steelbikeguy
I'm not sure if the lithium performs better than NiMH, or if the difference is due to the lithium having a nominal voltage of 3.7V versus the nominal 2.4V of the two AA NiMH of my earlier Canon. I suspect both used similar technology circuitry that had similar minimum voltage requirements.
It was a night-to-day change in winter for my bike power circuit when I swapped 5 NiMH batteries for 2 LiPo, I think, and this was not due to the nominal voltage as lights were operating well enough even when undervolted by 1V or so. I was worried I would blow my circuitry at the nominal 7.4V as it was a drop-in swap. However, all went well. With NiMH, the winter standlight operation was worse than a capacitor backup. With LiPo I can go on for hours in winter w/o the dynamo and honk w/o lights dimming. I chose LiPo over Li-ion due to its flatter discharge curve in my memory.