On 26 Jul 2021 at 9:06, Steve Clunn via EV wrote:
> If your 12v alx battery is going bad it could be pulling power from the DC to
> DC converter and draining the traction battery down more than usual.
Well said, and quite possible.
I had that happen to an EV in storage many years ago. I'd
If your 12v alx battery is going bad it could be pulling power from the DC
to DC converter and draining the traction battery down more than usual.
Steve Clunn
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Some of you know this, and the info is not current, but is good for LiFePO.
Anyhow, just to be complete in the discussion:
When a cell is discharged, the lithium ions are on the anode and the
cathode is depleted of ions. This is a pretty benign state chemically. But
as the cathode loads up Li
I have a 9 year old pack of CALB blue 100Ah cells. I am seeing cells
with very high self discharge. Probably 10's of milliamps. I am
concerned that these high resistance shorts will become low resistance
shorts and burn my garage down. (There is no excessive BMS loading)
Al
On 7/24/2021 9:01
For the 8 years I've had this pack my practice has been to charge it at a C/15
rate and stop when the first cell hits 3.45V. Its a 18kWh CALB.
You could watch the cells go from ~3.32V to 3.45V pretty quickly, once they
left 3.32V they'd be at 3.45V in <2mins and the charge stops.
It's been
For LiFePO, a parasitic load might be protective. It's that full charge
that is destructive.
On Sat, Jul 24, 2021 at 11:40 PM EVDL Administrator via EV <
ev@lists.evdl.org> wrote:
> On 24 Jul 2021 at 21:04, Michael Ross via EV wrote:
>
> > The worst thing you can do to LiFPO is to charge it
My personal experience is with the LiFePOcells, but the issue is there for
all/most? It's a shame because they are the most affordable (well maybe, I
haven't bought any since 2015).
In particular, the temperature at which trouble starts is significantly
lower for LiFePO.
I think if you go right
On 24 Jul 2021 at 18:38, paul dove via EV wrote:
> I suggest you disrobe it and charge it on a regular basis.
Oh, you young guys. That's all you think about. :-)
David Roden, EVDL moderator & general lackey
To reach me, don't reply to this message; I won't get it. Use my
offlist address
On 24 Jul 2021 at 21:04, Michael Ross via EV wrote:
> The worst thing you can do to LiFPO is to charge it fully, and let it sit
> around, especially in a hot location.
Isn't that the case for lithium batteries of any chemistry? I'm not a
lithium expert by any means; I'm just asking.
It occurs
The worst thing you can do to LiFPO is to charge it fully, and let it sit
around, especially in a hot location. For long term storage, I would guess
the best thing is maybe 50% SOC, and keep it as cool as you can without
actually refrigerating it (though I don't know if that is a bad thing). You
Here is my experience. I had some on the bench for a year and half. They
voltage on some had dropped so I was curious what capacity was left. I
discharged them and got 45 Ah. So I charged them and did another discharge and
got about 60Ah. So I diss a charge and discharge 3 more times. The fifth
Why don't you check the current draw with the car asleep? Sounds like
it's definitely some parasitic load. If it was internal to the cells, it
would likely go down to zero.
On Sat, Jul 24, 2021 at 6:01 AM Christopher Darilek via EV <
ev@lists.evdl.org> wrote:
> Hi Guys,
>
> I have an 8 year
Hi Guys,
I have an 8 year old LiFePO4 pack in my car and wonder if anyone knows what the
end of life failure mode is for these?
Over the pandemic lock down I was not driving the car for 3 months and noticed
one day that all the cells were flat, ~2V. I attributed this to some parasitic
loads
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