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Old 11-19-2012, 07:41 PM   #1
Rockwell OP
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Over Discharging A Shorai Battery

Anyone have experience over-discharging a Shorai battery?

I just read on their website that you should not allow the no-load voltage to go below 12.8V. My battery reading, read from within TuneECU, under some load (headlights, ECU) was 12.1V.

I didn't have a handheld volt meter handy, so I couldn't get a reading of the no-load voltage.

What is a typical battery voltage under the load of the headlights and ECU?

How long do these Shorai's typically take to charge (say from 50% charge)?
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Old 11-19-2012, 08:23 PM   #2
sonoran
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If you discharge below 10v then you risk permanent damage to the cells.

DAMHIK.
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Old 11-19-2012, 08:39 PM   #3
AdvGa
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Here is a general chart of the battery charge:

http://rvroadtrip.us/library/12v_system.php



State of Charge
12v Battery
Volts Per Cell
100%
12.6+
2.12
90%
12.5
2.08
80%
12.42
2.07
70%
12.32
2.05
60%
12.20
2.03
50%
12.06
2.01
40%
11.9
1.98
30%
11.75
1.96
20%
11.58
1.93
10%
11.31
1.89
0
10.5
1.75
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Old 11-19-2012, 08:57 PM   #4
Rockwell OP
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Here is the chart for battery charge from the Shorai website:



The voltages given are no-load voltages.

My battery is an 16AH battery. I am wondering if I could have gone form fully charged to below 10% in about 30-40 minutes with a load of the dash, ECU and headlights.

This would mean that 18AH would have been used up, or 32A-24A for that 30-40 minutes.

My headlight is 55W - at 12V that's 4.5A.

I don't think the ECU and dash would draw the remainder of the current.

Hopefully, I am just paranoid. I'll have to wait until morning to see.
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Rockwell screwed with this post 11-20-2012 at 05:43 AM
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Old 11-20-2012, 04:46 AM   #5
dogsslober
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drained

I left my key on one day after lunch, worked tell 3:30 and it would not start. Got a jump from a coworkers truck. My shorai is still working well. This happened 3 months ago.
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Old 11-20-2012, 06:00 AM   #6
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The Shorai batteries are not rated for their true Amp hours, they are rated for their equivalent starting power.

You should really get yourself a headlight switch with an off position.
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Old 11-20-2012, 06:34 PM   #7
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last july I left the headlight on overnight on my 525exc with Shorai 12 , next day was dead as could be, no measurable voltage , I charged it on the deltran for about 10 hours and it has been working great ever since
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Old 11-21-2012, 09:09 AM   #8
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Is there anything special about the Shorai vs the Turntech (other than capacity)? I thought they were the same underlying chemistry. I know the Turntech has no over discharge protection.

During a TAT trip last year my buddy left his headlight on (45 mins) on his new 5A/h Turntech. It would crank, borderline to start but wouldn't start. He then fatally ran it down further trying to start the bike. Over the following year it's got progressively more useless and on last months trip was always needing to be jump started.

Not trying to argue with the above stories of success after recharging, just curious. It's been one of those things that has kept me from considering one.
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Old 11-21-2012, 09:11 AM   #9
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Quote:
Originally Posted by Dustodust View Post
last july I left the headlight on overnight on my 525exc with Shorai 12 , next day was dead as could be, no measurable voltage , I charged it on the deltran for about 10 hours and it has been working great ever since
+1
thought I killed my Shorai the summer 2011 and the Voltage was 9 V only. Since the Shorai charger at first effort did not bring it alive I gave it some chock treatment with my automobile battery and then filled it up with the Shorai charger. Worked fine ever since. Anyway I find now a year and a half later that the charger wont fill it more than 14.0 Volt and I'll buy a new Shorai this winter. I'll never buy any cheap lead/acid batteries again since these may be everything from just fine until dead from day one. No more milliondollar YASA either.
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Old 11-21-2012, 11:34 AM   #10
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My thinking

I've killed a Turntech and a Shorai. I'm not going to get another one of these type of batteries until I see some changes. Like...

Smart battery that will protect itself from overcharging or discharging.
KJ
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Old 11-21-2012, 11:50 AM   #11
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Quote:
Originally Posted by knobbyjoe View Post
Smart battery that will protect itself from overcharging or discharging.
KJ
Supposedly not enough room in the case for the (necessary) electronics. Always seemed an odd reason given how compact electronics are these days.
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Old 11-22-2012, 03:55 AM   #12
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That dog won't hunt . . .

Quote:
Originally Posted by crazybrit View Post
Supposedly not enough room in the case for the (necessary) electronics. Always seemed an odd reason given how compact electronics are these days.
Yeah - that story is the epitome of "that dog won't hunt". The capacitors and inductors required to have a "good" charging circuit are TEENY !

Yes, it IS a more complicated circuit when your balancing MANY cells, often not in a strict "all parallel or all series" arrangement as is almost always the case . . . another Shorai "story".

ANY lithium cell, once significantly drained is permanently compromised. It's chemistry (or physics, if you prefer).

Me, I ride Anti-Gravity batteries after a failure of a Shorai after just 6 weeks . . .
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