new non sulphating battery from Soneil
It can be used at -40 C 1/3 the cost of Li 80% depth of discharge 1500 cycles https://soneil.com/wp-content/uploads/2018/07/12-EFSL-185.pdf
Forum Discussion
I’m no real fan of lithium - Cost and recharging below 25 degF would not be favorable to me. But in the context of vibration AFAIK they seem to do ok in electric cars and portable electric tools...
