Those little diesel heaters have my attention. I think they burn 0.1l/hr or something equally miniscule like that. That equates to 1/2 gal. IMP /day...
I will mention some of the devices you can use to restore a battery will send high frequency AC pulses into the battery. The idea is the pulses will...
I have done the same and batteries became usable again.
I have also flushed out batteries with distilled water and refilled them with sulphuric acid...
Hey OrganicFoxes, be sure to have your alternator & voltage regulator checked. It sounds like your battery electrolyte boiled away, which is usually...