Winter Storage & Lithium Boat Battery

I have my boat stored in an unheated garage in Northern MN. For various reasons, my lithium batts are still in the boat. Not ideal I know…the temp was -22 last night.

Rather then pull them – they are hell to get out and especially to put back in come Spring – I have an idea to float to the IDO crowd. This could be dumb so thats why I’m asking – help avoid a potential problem.

Do you see any harm in throwing an outdoor heated pet blanket over the batteries in the battery box and leave it there over the next few months? The heated blanket is on a thermostat I could set to ‘low’.

Thoughts? Anyone ever done it??

I personally wouldnt risk it. Thats a lot of money in batteries to potentially ruin.

I wonder if there is a fire hazard leaving it on so long unsupervised. I know they usually have some kind of smarts in the controller now but I’ve seen the controller itself start smoking on one we had. What if a mouse chews something or who knows what could happen.

This is from Battle Borns website. Your conditions are not ideal but as long as you don’t charge them they might not get damaged. I would try to get them out in a warmer site.

From BB:https://battlebornbatteries.com/will-lithium-batteries-freeze/?gad_source=1&gclid=Cj0KCQiAsOq6BhDuARIsAGQ4-zh2-I-p-_V5GgT82mGeqvcMQ3XFESU_0ZOBrG2ARmbRFOL5QIAielQaAsY5EALw_wcB”>

I don’t know, an unattended electrical heating device that’s probably made in China or Pakistan, running 24/7 unattended, in a confined compartment next to multiple high-energy batteries in a garage.

I have always taken batteries out of everything that is in unheated storage. I don’t even leave cordless tool batteries in unheated spaces. I just wouldn’t risk it both money and safety wise.

What’s the difference between that and dewalt and Milwaukee tool batteries used in construction ? I leave mine in the garage all winter . I take the big ones inside to charge for the ice auger but I always thought as long as your not charging them your good .

Battleborn’s specified storage temps are -15F – 140F. So they should be pulled.

If you decide not to pull em – make sure they are fully disconnected from any potential ghost drain.

You already know the answer to the pet blanket question.