I am getting quite a "charge" out of these battery stories for sure! hahahahahaha
Our big industrial type ice breaker is now sitting awaiting some programming information to fix a bogus telegraph that is running rogue - I really despise electronics/computer system programming when it fails...argh!
Anyway digressing......, batteries and maintaining them.....
Charger wise I have a very old (maybe 30 years old) Canadian tire jobbie that has 6-12 volt with 2, 10 and 50 amp settings. Still works quite well but is not "automatic" for shutting off once a battery is full up to speed.
What type of battery are you going to charge? AGM, Lead Acid, Gel.....this will affect what charger you use and how it goes about charging the battery .
Regular Lead acid you can get away with pretty much throwing 14 volts at 2 amps and you will slowly charge - provided there isn't some issue with the battery. Overtime the plates in the batteries tend to plug up and the ion transfer is not as efficient, battery amp hour capacity drops and eventually the battery needs constant charge. You lads out in the prairies can generally experience very cold winters that last for extended periods. Cold batteries work slower and are not great in the lower temps (below like -20). If you have a battery that gets very low on charge the electrolyte can freeze. Once frozen the battery will die very quickly. If you thaw it and charge it you may or will have issues with dead cells (plates that will not fully charge) - this can lead you to believe you have the battery all set and a few days later it is toast.
You have to be careful with the Gel, AGM batteries as they need a different charging method and the charger will indicate that is it good to go for those type batteries. We had a lad hook up the regular charger to an AGM 12 volt for the small boats and it basically ruptured after 1 hour charge and gassed out the winch compartment. Luckily no one was in the space when it ruptured or they might have had a bad day. We have gone through a lot of chargers over the years but we still have the big roll out (like
@CalgaryPT ) and we have a smaller motor master that is rated for the AGM batteries.
If you have a dead battery in the car and the voltage is less than 9 or so, it may be that you can charge but your battery will never fully recover. the deep cycles are designed to take the loads to lower voltages and can then be charged back up multiple times. Car batteries are typically maintained around 12.5 to 13.5 volts and are not really designed to be constantly drained and charged.
@Chicken lights has quite the bank of batteries but they should be able to sustain some drain and recharge as is the requirement of having a large truck and the camper section.
One thing that will help with the cold starts is a battery blanket to keep things warm and those ions flowing around quickly. If the battery is dying soon after recharge, usually, Crappy tire will load test it for you and see if it is worth saving. If a new battery is toasting quickly - check for drains in the system, bad grounds, onboard computers not shutting down etc....
Recommended chargers....hmmmm....I have had good luck with the motor master one at Canadian Tire but they do not carry it.
This on is on sale and general all purpose for lead acid/gel and AGM:
https://www.canadiantire.ca/en/pdp/...y-charger-with-80a-engine-start-0111979p.html