Re: [solectria_ev] Re: calb battery
- bad conclusion. It dropped before the rest so some damage but minimal. still
useable if you bottom balance the pack.
From: "theoldcars@..." <theoldcars@...>
Sent: Mon, April 8, 2013 8:37:14 PM
Subject: Re: [solectria_ev] Re: calb battery
Or you could say it is a 20 amp load for 5.5 hours = 110Ah
Which is not bad for a 100Ah cell.
So no loss of capacity and most likely will not affect the cycle life.
Glad to hear all is well
In a message dated 4/8/2013 5:05:07 P.M. Pacific Daylight Time,
Today I drained those 4 batteries. I connected them in series to a 12 volt
250 watt landing light at 11:30 and at 5pm the cell voltage dropped below
3 volts. At 5:20 I measured 3 cells at 2.8 and the one that I accidentally
over-discharged was down to 2.6 so I stopped right there. Their voltages
stayed remarkably even during the discharge until dropping below 3.0 but that
seems to be the same thing that happened with the rest of the pack too
when I was draining them. so 250 watts/12.8v nominal x 5:50 = 113.8ah
--- In firstname.lastname@example.org_
(mailto:email@example.com) , "russell_fauver" <russell_fauver@...>
>to 1.0v. I charged the 4 batteries for 8 more hours today at 9ah. Let them
> Good news. It doesn't seem like the battery was hurt by draining it down
rest for a few hours, then put them back on tonight at 10ah and it took
1:35 to finish them up. When the first cell hit 3.55 I stopped the charge.
The 4 cell readings were 3.55, 3.45, 3.47 and the one I flattened was 3.51.
They all stayed nice and cool during the charge.
>in parallel overnight. I was surprised by how close they stayed during the
> This morning they were all at exactly the same voltage after being tied
8 charge today, the voltage between cells didn't stray more than 0.01.
Tonight was pretty consistent too until they hit 3.4 volts, then they started
> --- In solectria_ev@yahoo groups.com, Russell Fauver <russell_fauver@>
> >did. I told my wife to pull the plug since she was right next to it. Maybe 30
> > It was discharging at 7 amps when I came inside and realized what I
seconds or so had passed until I got there and measured the voltage at
1.0, I don't know how low it was under load.
> >on an 8 amp charge. The one I over discharged started out about 0.02 volts
> > Last night I matched it up with 3 other discharged cells and put them
higher than the others and stayed within 0.05 during the charge. After 3
hours I took 'em off the charger and tied them together in parallel to
let them sit over night.
> >[Non-text portions of this message have been removed]
> > I'll charge them more today and see how it goes.
> > [Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
- thanks Mark. Lots of great info on there
--- In firstname.lastname@example.org, MARK BUSH <musicmjb@...> wrote:
> Hi Russell,
> If you want to know what is going on in these CA Cells I would suggest watching www.evtv.me watch the friday April 5 2013 show. Jack Rickard has been playing with these batteries LiFePO4 since 2008 he has personally destroyed many cells in the name of science and knows by experiment after expensive experiment how they function check it out.
> Mark J Bush
> "Keep On Pluggin"
> On Apr 4, 2013, at 10:50 AM, russell_fauver <russell_fauver@...> wrote:
> > I have been cycling my new Calb CA100's and I let one of 'em get too low. I was discharging it, went outside and promptly forgot about it. When I came back in I disconnected the load and checked the voltage... 1.0 volts. After sitting for a few minutes it had recovered to 2 volts and I connected it to another cell that I drained to 2.8v earlier in the day. It seemed to accept the power ok but I wonder if i've done any permanent damage to the battery. Would it be best to just trash it or should I spend some time cycling it and see how it does? I'd hate to put it in the car and have trouble with it down the road. What do you think?
> [Non-text portions of this message have been removed]