That's the ticket.frontrangeleaf said:I did specifically look for reserve minutes and amp hours, rather than high CCA.
That's the ticket.frontrangeleaf said:I did specifically look for reserve minutes and amp hours, rather than high CCA.
I welcome a discussion, but that is different than feeling obliged to counter 'LFP is great in the LEAF!' posts that do not bother to clarify weather gotchas. I'm not saying LFP without thermal control in below freezing temps is dangerous, I'm saying it is not suitable for cold weather climates.knightmb said:I agree, but we have to push back against the idea that once it dips below 32F, the battery will fail or catch fire.SageBrush said:The two of you push LFP when 12v comes up but others should realize that LFP is not suitable for cold climates without thermal control
Color me skeptical on that claim. There is a lot more power drain on the 12v than just starting up the car.Even if it won't charge quickly under 32F, that's still enough capacity to power up the Leaf over and over for months until it finally does get warm.
SageBrush said:I welcome a discussion. I'm not saying LFP without thermal control in below freezing temps is dangerous, I'm saying it is not suitable for cold weather climates.knightmb said:I agree, but we have to push back against the idea that once it dips below 32F, the battery will fail or catch fire.SageBrush said:The two of you push LFP when 12v comes up but others should realize that LFP is not suitable for cold climates without thermal control
Color me skeptical on that claim. There is a lot more power drain on the 12v than just starting up the car.Even if it won't charge quickly under 32F, that's still enough capacity to power up the Leaf over and over for months until it finally does get warm.
Coolknightmb said:I'll start a topic about it
Specifically AGM 51r designed for deep discharge (not a battery designed for high Amp, cold weather starting applications)To the OP, I agree with everyone here, go with a good quality AGM as it's a one and done for replacement.
LeftieBiker said:Unclear this is a "deep discharge" - not marketed as a marine/RV style, but that might be due to the modest size.
I think that Chinese brand marketing strategies have percolated into American companies. In this case that means 'put some fiberglass strands into a starting battery and then label it "AGM." It will likely still be better than a starting battery with no 'glass' but not as good as a battery designed from the beginning to be AGM.
If I'm following along properly, the main reason we recommend AGM batteries for the Leaf is that they resist sulfation due to low charge, largely because they don't stratify the way a flooded battery does when left sitting at low charge. That, and they're more affordable that lithium, at least for now.
If you have an absorbent glass material battery or a gel cell battery they probably cannot be charged using a standard battery charger. AGM and gel cell batteries cannot tolerate quick speed charging like the standard battery chargers create. These types of batteries need to be given a slow and steady charge over several hours rather than a fast paced charge in the span of a few hours.
If you overcharge an AGM battery there is a distinct possibility that you will damage the battery to the point that it does not function. At the very least an over charged AGM battery will no longer be able to hold the same amount of a charge and will be easy to discharge quickly.
nlspace said:i can't find any information that supports higher current for AGM, in fact just the opposite:
If you have an absorbent glass material battery or a gel cell battery they probably cannot be charged using a standard battery charger. AGM and gel cell batteries cannot tolerate quick speed charging like the standard battery chargers create. These types of batteries need to be given a slow and steady charge over several hours rather than a fast paced charge in the span of a few hours.
If you overcharge an AGM battery there is a distinct possibility that you will damage the battery to the point that it does not function. At the very least an over charged AGM battery will no longer be able to hold the same amount of a charge and will be easy to discharge quickly.
From what i found online, the typical standard AGM charging rate seems to be 0.1C, so for a 35Ahr battery that would be 3.5 Amps; with a maximum rate of 0.2 to 0.3C depending upon manufacturer, but seems to be not recommended except for time-critical situations.
The internal resistance is related to the rate of the chemical reaction in the cells, the biggest factor is temperature; but its still the same lead+sulfuric acid chemical reaction in all of them.
The laef seems to be set up to charge AGM without damage to them, but the compromise is that it is somewhat insufficient to maintain flooded cell batteries such as an ICE car.
knightmb said:Actually, I might have that answer in this topic: https://mynissanleaf.com/viewtopic.php?f=9&t=32938
Near the bottom of the first page where I posted screen-shots from LeafSpy.
Learjet said:knightmb said:Actually, I might have that answer in this topic: https://mynissanleaf.com/viewtopic.php?f=9&t=32938
Near the bottom of the first page where I posted screen-shots from LeafSpy.
I'm pretty sure the voltage reduces below ~14.4 to ~13.1 at some amp level of charge, assuming the windshield wipers are not on.
Looking at your screen shot, it may reduce initial charge voltage at 0.5 amps? should be a pretty easy thing to watch leafspy after initial startup and note the amp level when voltage is reduced.
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