3 years is junk…most are 5 or more and some up to 11. If you have to replace all 3 I wouldn’t use their brand again.
I’d call Norsk or Dakota and ask them. I know it’s ok to replace SLA as long as they are the same type. Not sure why that wouldn’t work with lithium.
I would buy 3 Li Time batteries for almost the same amount of money as one tracker battery.
Then try and sell the 2 you have to someone that only needs 24 volts.
So ive been doing a lot of homework lately since im switching to lithium. First thing is if your handy or can find someone who can do it, is to see if you can just repace tbe bad cell or cells in the battery. The nice thing about lithium is they can essentially be rebuilt. If that isn’t an option, look into a single 36v battery WITH Bluetooth. That way you can monitor and set charging levels (partial charges for long term storage). A single battery makes it a single BMS so management is simpler. May be an investment since you’d need to switch chargers as well. I wouldn’t hesitate to go with a cheaper battery as long as it has prismatic cells. Those Dakota and such have nice warranties but you can buy 3 sets of Eco-worthys or equivalent for tbe price. My 2 cents.
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