Are lithium batteries worth the cost?

FWC wrote:

Grit dog wrote:
Keeping on topic and out of Kayteg land....
Anyone have practical experience using them at low temps?
I only know what I’ve read and what I’ve experienced with my Snowbike lifepo4 battery.
Seems this is the one practical Achilles heel of them.

Yes, I have used my lithium pack in low temperatures discharge down to about -15C and charging at ~ -10C. The voltage was definitely lower at low temperatures, and I assume they loose some capacity (I have plenty to spare, so I have not tested this). The loss of capacity with temperature is true of all batteries, and is actually less severe with LiFePO4 vs AGM/FLA:

My concern with LifePo4's would not be so much reduced discharge current capacity at lower temps, but the chance of permanently damaging the cells with *excessive* charge (and discharge) current at or below a given temp. I've always heard you should dramatically reduce charge current (or not even charge at all) below 0c (32f) with LifePo4 cells. I've heard -18c (0f) is a very similar type of cut-off for discharge current.

Did a cursory look for a graph that shows the maximum charge (and discharge) current and temperature relationship for LifePo4, but couldn't find one. Have you seen one?