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Battery charging

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jato View Drop Down
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Post Options Post Options   Quote jato Quote  Post ReplyReply Direct Link To This Post Topic: Battery charging
    Posted: 21 Sep 2021 at 5:02pm
Thanks.  I find this interesting in that in the north we figure 4 years for a set of deep cycle batteries for electric carts, they get used roughly 7 -8 months a year while the same batteries will last for 6 years in Florida and they get used 12 months a year!
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offgrid View Drop Down
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Post Options Post Options   Quote offgrid Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 2021 at 1:12am
It's well understood that heat increases internal corrosion and reduces battery shelf life. And as you say they are getting more cycles annually in FL. So the GC batteries should last longer in MI.

Their effective capacity is reduced by cold though, because the chemical reactions slow down and the battery internal resistance goes up. So
their voltage will drop off faster and it will appear the the battery needs to be replaced. But that effect is reversible. Warm them up and you should get the lost capacity back.

So it is likely that you are replacing them prematurely, in order to have fresh batteries with enough effective capacity in cooler weather to get through the day. You might want to try keeping some and seeing how they do in the hotter months in summer, or take them to FL for the winter.

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jato View Drop Down
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Post Options Post Options   Quote jato Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 2021 at 7:13am
So maybe instead of storing it on a concrete floor in an unheated garage where temps here often get 0 or less it should be stored in the basement of my house on a concrete floor where temp is more moderate - 52-54 degrees?
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'17 Ford F-150 4WD 3.5 Ecoboost
Jim and Diane by beautiful Torch Lake
"...and you will know the Truth and the Truth will set you free."
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john in idaho View Drop Down
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Post Options Post Options   Quote john in idaho Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 2021 at 8:04am
yes
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offgrid View Drop Down
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Post Options Post Options   Quote offgrid Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 2021 at 11:06pm
I'd say no. The lower the storage temp the less internal corrosion. Just don't freeze the battery, which won't happen if you keep it charged. If youve gotten 10 years out of your existing batteries keeping them stored on the floor then the proof is in the pudding (electrolyte) so to speak.

What I think seems to confuse ppl is the difference between storage and use. If you were using the batteries I'd say keep them warmer, so they have more available capacity. But if youre just storing them then you dont care about that, you just want the lowest possible corrosion rates.
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Olddawgsrule View Drop Down
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Post Options Post Options   Quote Olddawgsrule Quote  Post ReplyReply Direct Link To This Post Posted: 23 Sep 2021 at 7:02am
OG I agree to an extent with you as my batteries stayed outside through the winter here in the Nor'east. I'm a believer that batteries are meant to be used, not stored so I disconnect the batteries during the winter and setup a low draw to keep them working (led light). This meant charging once a month. 

Now being on lithium, I bring them inside and use them as a UPS as we lose power during the winter. 
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jato View Drop Down
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Post Options Post Options   Quote jato Quote  Post ReplyReply Direct Link To This Post Posted: 23 Sep 2021 at 11:40am
Thanks OG, I appreciate your wisdom and advice.
God's pod
'11 model 177
'17 Ford F-150 4WD 3.5 Ecoboost
Jim and Diane by beautiful Torch Lake
"...and you will know the Truth and the Truth will set you free."
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