Recent Topics
About base stocks and additives (not the usual Q!)
by Olas
21 minutes 35 seconds ago
Ex Top Gear hosts ink deal with Amazon
by Hokiefyd
28 minutes 23 seconds ago
What do you consider short trips?
by dedonderosa
52 minutes 34 seconds ago
0W-40 in a GM 3800
by Merkava_4
Today at 02:30 AM
Back in the wild west
by expat
Today at 12:54 AM
Chinese Tesla Clone
by Y_K
Today at 12:35 AM
Anyone Download Windows 10 Yet? Thoughts ... ?
by ZeeOSix
Yesterday at 11:53 PM
New AAP specials 7/30-8/26 downgrade
by slacktide_bitog
Yesterday at 11:25 PM
Rotella T5 10W30, 10110 mi, 1998 volvo 960
by KDonkey
Yesterday at 10:19 PM
Rabbits
by Pop_Rivit
Yesterday at 09:25 PM
Castrol Edge 5 quart jugs 22.97 Wal-Mart & Amazon
by BrewCityR
Yesterday at 09:09 PM
Camry KYB Quick Strut Experience
by Big Smoke
Yesterday at 09:09 PM
Newest Members
Oil_Punisher, Acelarsen, F24Sonata, leadoilfiled, Kickingrass
54881 Registered Users
Who's Online
75 registered (A_Harman, 2civics, aquariuscsm, 2010_FX4, 2009Edge, 9 invisible), 1099 Guests and 94 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
54881 Members
66 Forums
235091 Topics
3781883 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Page 2 of 2 < 1 2
Topic Options
#3316444 - 03/19/14 12:58 AM Re: Battery completely dead ... but at 9V? [Re: Miller88]
MNgopher Offline


Registered: 09/17/02
Posts: 3230
Loc: Lakeville, MN
9V is way dead. Anything under 12V is pretty well dead, and you should be planning on buying a new battery. Our previous 88 Cherokee did the same thing. Left a door slightly open, lights on all night, and dead as a doornail. The battery limped on for two months, then kicked the bucket.

Top
#3316626 - 03/19/14 08:41 AM Re: Battery completely dead ... but at 9V? [Re: Miller88]
rshaw125 Offline


Registered: 08/18/04
Posts: 2697
Loc: Raleigh ,NC CSA
Put it on a 2 amp charge for a day. Remember the alternator is not designed to charge a dead battery. Drive it and then check voltage with engine off. Should be around 12.75 volts if fully charged.
_________________________
2012 Porsche Carrera S
1995 Plymouth Voyager

Top
#3316732 - 03/19/14 10:21 AM Re: Battery completely dead ... but at 9V? [Re: Miller88]
Vikas Offline


Registered: 07/22/05
Posts: 9442
Loc: NorthEast
I think the guys who did that want your NEW battery!

Top
#3316810 - 03/19/14 11:08 AM Re: Battery completely dead ... but at 9V? [Re: rshaw125]
wrcsixeight Offline


Registered: 10/15/10
Posts: 1231
Loc: california
Originally Posted By: rshaw125
Put it on a 2 amp charge for a day.


The vehicle in question probably has a ~75 amp hour battery.

10.5 volts is considered 100% discharged. If the battery in question were still healthy, at still near full capacity when it was drain to 9v, it would require anywhere from 110 to 125% the energy removed from it. Lets say 125%

94 amp hours 94 amp hours divided by 2 amps is 47 hours.

If the charger used does not recognize the battery because of the 9v factor, the battery should be paralleled to a known good battery and then charged until its resting voltage is high enough that the charger will recognize it..

Since the battery in question is likely has nowhere near full capacity remaining, a day at 2 amps might be enough to bring it near full charge.

If this theoretical 2 amp charger does not raise the voltage into the mid 14's it is likely it will never
_________________________
LA 318 Roller Cam
M1 0w-30 AFE
FL-1A filter

Top
#3316937 - 03/19/14 12:21 PM Re: Battery completely dead ... but at 9V? [Re: Barkleymut]
Miller88 Offline


Registered: 04/09/08
Posts: 8992
Loc: Onondaga County
Originally Posted By: Barkleymut
Google tells me that he is very close to Syracuse NY


Yup. I live in the city of Syracuse. A mini detroit. Per capita, we have worse crime!

Anyway, I let it until the morning. Then let it sit for a while and checked voltage. 12.6.

That's higher than what it is after the Jeep sits for a few days. I have some parasitic draw that I need to get sorted out. It'll kill a battery on its own if left for 2 or 3 weeks.

I'm going to continue charging it. I'm sure I *could* have jumped it off of the Focus, but if it's that low, I don't want to risk the 14 year old alternator.

I'm going to let it charge at 2 amps overnight again and see what happens.
_________________________
'00 Jeep Cherokee
'11 Ford Focus

Top
#3317379 - 03/19/14 07:47 PM Re: Battery completely dead ... but at 9V? [Re: Miller88]
redbone3 Offline


Registered: 06/09/12
Posts: 287
Loc: Reno, NV
Originally Posted By: Miller88
Electrolyte levels are good and it didn't freeze.

Up to about 10.6 volts. I have it on the 2 amp charge. I try to avoid 6 amp charge.


6 amps won't hurt anything and it will charge faster.
_________________________
2014 Passat Wolfsburg, 1995 Miata.

Top
#3317801 - 03/20/14 07:55 AM Re: Battery completely dead ... but at 9V? [Re: Miller88]
Miller88 Offline


Registered: 04/09/08
Posts: 8992
Loc: Onondaga County
Let it do the 6 amp charge for 6 hours last night. Getting there! It's holding voltage higher than it does in the Jeep. Hopefully letting it run again tonight on the 6 am charge I'll be fully charged.
_________________________
'00 Jeep Cherokee
'11 Ford Focus

Top
#3320160 - 03/22/14 07:49 PM Re: Battery completely dead ... but at 9V? [Re: Miller88]
Da Game Offline


Registered: 12/27/05
Posts: 575
Loc: Chicago
Here is one from Associated Equipment that will recharge a battery down as low as 1v. Thats the override switch.

http://associatedequip.com/product/model-9640/

This Interacter will charge also as low as 1v.

http://interacter.com/products/industrial-commercial-series-specs/

Both made in the USA.

Top
Page 2 of 2 < 1 2