|06-19-2021 09:47 AM|
From Solacity Website:
Storing Lithium-Ion Batteries
The very low self-discharge rate makes it easy to store LFP batteries, even for longer periods. It is no problem to put a lithium-ion battery away for a year, just make sure there is some charge in it before placing it in storage. Something between 50% – 60% is ideal, that will give the battery a very long time before self-discharge brings the Voltage close to the danger point.
Storing batteries below freezing is fine, even at very low temperatures such as -40 Centigrade (that is the same in Fahrenheit), or even less! The electrolyte in LiFePO4 cells does not contain any water, so even when it freezes (which happens around -40 Centigrade, depending on the particular formulation) it does not expand, and does not damage the cells. Just let the battery warm up a bit before you start discharging it again, which is OK at -20 Centigrade and above. You will see an apparent loss of capacity when discharging at below-freezing temperatures that reverses when the battery gets above freezing, and there is a slightly accelerated effect on aging. Storing them at low temperatures is certainly much better than storage at high temperatures: Calendar aging slows down dramatically at low temperatures. Try to avoid storing them at 45 Centigrade and above, and try to avoid storing them completely full if possible (or nearly empty).
If you need to store batteries for longer periods, be sure to simply disconnect all wires from them. That way there can not be any stray loads that slowly discharge the batteries.
I have Ionic LFP batterries and will leave them in the boat over the winter. My concerns are with the current heat wave, not the coming winter.
|06-18-2021 02:26 PM|
|muskyed||A couple of the manufactures now offer built in heaters for charging in cold weather. One of them is pretty slick in that when pluging in the charger, if it is too cold, it will automatically turn on the heater till the battery temp comes up to a safe level to charge. Also as to cold storage, hard to believe that is much of an issue as Rangers fisherman series now come standard with lithium trolling mtr batteries, and I seriously doubt they are going to say you have to take them out when it is cold out. I hope to make the switch soon, but am waiting for this heater technology to sort out. Heating blankets are old technology. In tests where they broke down some of the popular batteries to see how they were constructed, Battle born, and Relion I think, had good reviews for their quality of construction. Seems to be advancements all the time now in this stuff.|
|06-18-2021 12:37 PM|
|jjy||Check out Rebel lithium batteries. Prices were good enough to make me take lithium jump. Their service is also very good. Responded quickly to all my questions. I'm running their 50ah batteries. Been very happy so far.|
|06-16-2021 03:43 PM|
As I said (twice ) before, 23ºF is RELiON's/Tracker's minimum storage temperature, not their minimum charge (or discharge) temperature.
And I was speaking with a fellow in technical support, not sales, who clearly knew his stuff and wasn't just reciting their advertised specs.
That said, I can believe what you say about the BMS in these and other lithium batteries actually being much more capable of handling frigid temperatures than that minimum storage temperature indicates. Probably RELiON is just being overly conservative to head off the possibility of unhappy customers, as I mentioned; some companies are simply much more risk averse than others. But maybe not. I'd need technical information not currently available to me to decide how seriously to take it.
I see no reason to disregard RELiON/Tracker for this, in any event. Others might not be, but I'm OK with removing the batteries when I store the boat for the winter. And if I ever become decrepit enough with age that I'm not OK with it anymore, I'll buy whatever heating pad(s) I need.
IF I decide to make the switch to lithium at all, that is. Still thinking about that.
P.S. I've actually had numerous problems with the computer in my truck (2016 Ford F-150) during the coldest parts of our winters, every year since I bought it new.
|06-16-2021 03:03 PM|
|06-16-2021 07:21 AM|
I think that either 1) RELiON and Battle Born batteries are essentially the same but RELiON is motivated more strongly by avoiding unhappy customers whereas Battle Born is motivated more strongly by maximizing sales, or 2) Battle Born's in-battery computers are better made with respect to handling cold temperatures. No way to tell between these from my conversation with him. We didn't actually discuss warranty issues that might result or have resulted from subjecting these batteries to frigid temperatures. That would have been a good thing for me to ask about, and I'm sorry I didn't.
For my part, if I make the switch to LiFePO4 (I'm still mulling it over), I guess that for now at least I'll plan to take the batteries out of the boat when it comes time to store it for the winter.
We also talked a bit about RELiON's heated batteries - which pertains to their use and charging, not their storage - and the fact that they can't be connected in series. He said that they're actively working on that and plan to offer their solution soon.
|06-16-2021 05:14 AM|
|Yellow Fever||Ozark Bob always does great research. What i get from this is that the anglers that fish till freeze up, ( and we frequently fish that at Quinte) possibly should not be using these batteries if you don't have a shop to put your boat in at the end of the day so you can charge the batteries. Am i right?|
|06-15-2021 07:51 PM|
|Ozark Bob||So, What have you gleaned from that? I am seeing a CYA and the hint he thought the batteries are the same, but the language was different? I also heard no statement about any warrantee issues. I guess I am just not able to decipher the corporate lingo. Bob|
|06-15-2021 07:01 PM|
Had a chance to talk with a guy at RELiON today, and the 23ºF minimum storage temperature of their LiFePO4 batteries is one of the things I asked him about. He said that's their specification because there's a risk that the computers in their batteries will be damaged by temperatures colder than that, and he recommended that folks such as myself who live where it gets colder than that either remove the batteries for storage someplace warmer or buy one or more heating blankets suitable for use with batteries.
I mentioned that Battle Born specifies a much more accommodating -10°F minimum storage temperature for their LiFePO4 batteries, and he said that's the point at which the cells in any such batteries would start to be damaged by the cold. He suggested that Battle Born's in-battery computers may be at just as much risk to damage from temperatures below 23°F as are RELiON's, but Battle Born may have decided that the risk is small enough to be worth taking so they can advertise that much lower minimum storage temperature.
|05-31-2021 11:08 AM|
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