Recent Topics
5w50 in the stash
by cptbarkey - 12/12/19 03:07 PM
Jingle Bells...
by GumbyJarvis - 12/12/19 02:38 PM
Meguiar's M305
by sohccammer427 - 12/12/19 02:29 PM
Will it fit?
by Bettez88 - 12/12/19 12:58 PM
Diagnosis Confirmatioin
by Gebo - 12/12/19 12:58 PM
Mercury 25hp PCMO
by SimpleGuy48 - 12/12/19 12:50 PM
IIHS Pushing for Better Headlights
by SubLGT - 12/12/19 11:58 AM
My favorite flight ever
by Astro14 - 12/12/19 11:31 AM
Does anybody else have reactions to MSG?
by Chris142 - 12/12/19 10:35 AM
injecter cleaner?
by ernied - 12/12/19 09:27 AM
Which would you use for 5k
by Bettez88 - 12/12/19 09:08 AM
Effective ways to reduce humidity inside the car
by MoneyJohn - 12/12/19 08:21 AM
Stupid regulations- Diesel Cap Color
by Rmay635703 - 12/12/19 08:20 AM
Help a not-so-noob: shear stability theory.
by OilStasher - 12/12/19 08:03 AM
Latest oil purchase for Lawnmowers
by Snagglefoot - 12/12/19 07:44 AM
Old school bra
by whizbyu - 12/12/19 07:10 AM
Tricky flight ticket change fees
by Superflan - 12/12/19 07:10 AM
Newest Members
kalima, Powertool1994, lutvi20, Bazik, Lamasuna
70113 Registered Users
Who's Online Now
109 registered members (4WD, alchargo, 53' Stude, 77GrandPrix, 12 invisible), 2,010 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics298,632
Posts5,139,582
Members70,113
Most Online3,589
Nov 2nd, 2019
Donate to BITOG
Print Thread
Hop To
Page 1 of 2 1 2
Where can I get a dumb battery charger? #5264141 11/11/19 11:56 AM
Joined: Jun 2003
Posts: 19,917
C
Chris142 Online Content OP
OP Online Content
C
Joined: Jun 2003
Posts: 19,917
The new battery chargers can't "see" a battery if it's very run down. Especially a run down agm battery. I need one that will bring those ones back up.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264155 11/11/19 12:11 PM
Joined: Oct 2010
Posts: 174
T
terry274 Offline
Offline
T
Joined: Oct 2010
Posts: 174
I don't have any experience with this charger, but it seems to be a "manual" charger. It is from Harbor Freight, so there's that.

Battery Charger

Last edited by terry274; 11/11/19 12:31 PM. Reason: spelling

2011 Toyota Avalon
2019 Honda Ridgeline
2009 Ford Taurus
2012 Honda Accord
1996 Ford F150
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264170 11/11/19 12:26 PM
Joined: Sep 2014
Posts: 1,710
W
WobblyElvis Offline
Offline
W
Joined: Sep 2014
Posts: 1,710
I take it you already have a modern "smart" battery charger and some old battery it won't recognize.
Find one of those old little black power supplies [wall wart] for a cordless phone or some other device, you may be able to start charging a dead battery with one of those. One that puts out between 10 - 18 volts D.C. is ideal. Adapt the wires to the battery clamps of your smart charger and let it charge for a day or so. This should bring the battery to a state where the smart charger can take over.

Re: Where can I get a dumb battery charger? [Re: Chris142] #5264172 11/11/19 12:29 PM
Joined: Aug 2017
Posts: 984
D
Dave9 Offline
Offline
D
Joined: Aug 2017
Posts: 984
It is very easy to build your own, merely needing a 12V transformer and rectifier diode. For example you could use a transformer from a landscape lighting set if it's the old linear style instead of the newer with a switchmode PSU, or if you are not in a hurry, one of those old school wall wart AC/DC adapters that just has the transformer, diodes and a capacitor inside. You can tell them apart because they are typically larger and heavier, closer to a square/cube shape, and that without a load their output voltage is closer to 16V.

For that matter if you are creative with resistor values you could even use a switchmode 12V AC/DC adapter. You'd put the resistor in series so the current stays low enough that it doesn't go into shutdown from being under voltage. That would only bring the battery up to approx 12.0V but that should be enough, and yet it is usually going to be the slowest way to charge, taking closer to a week depending on discharge state and battery capacity.

Re: Where can I get a dumb battery charger? [Re: Chris142] #5264173 11/11/19 12:29 PM
Joined: Mar 2004
Posts: 23,272
D
Donald Offline
Offline
D
Joined: Mar 2004
Posts: 23,272
Aren't there other solutions like attaching a jump pack for an hour to bring up the voltage of the dead battery to a point where the smart charger will accept and charge the battery?


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264175 11/11/19 12:33 PM
Joined: May 2011
Posts: 94
L
Loi Offline
Offline
L
Joined: May 2011
Posts: 94
NOCO Genius G7200 is what I use.

https://no.co/products


'05 GDB STI
'16 VAB STI
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264185 11/11/19 12:49 PM
Joined: Jan 2012
Posts: 66
I
italian68 Offline
Offline
I
Joined: Jan 2012
Posts: 66
Hook it up to a running car for 10min


07 BMW 530i 50k Castrol Edge 0w40 Mann
06 Ram 2500 5.7 109k QSUD 5w30 51515
05 Camry 2.4 112k QSUD 5w20 51516
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264187 11/11/19 12:51 PM
Joined: Sep 2015
Posts: 2,287
M
mk378 Offline
Offline
M
Joined: Sep 2015
Posts: 2,287
Looks like they still make the Schumacher SE-5212A. You want the A one with an analog meter on the front not the E one with LEDs. I have an old SE-3005 which is very similar and it will revive (or attempt to) batteries that are run down to zero.

Re: Where can I get a dumb battery charger? [Re: Chris142] #5264192 11/11/19 12:56 PM
Joined: Apr 2018
Posts: 741
R
Rmay635703 Offline
Offline
R
Joined: Apr 2018
Posts: 741
Rummage sale?

My fathers 60’s era Schumacher 2/6 6v/12v Charger still works great, I use it weekly on my old truck that seems to have a slow short.


I’ve also built a deadman’s charger for battery recovery of failed batteries using about $5 of parts and some broken junk I have laying around

http://www.alpharubicon.com/elect/3dollarbattggn.htm

It’s similar to this but I made mine out of a power strip an extension cord and a shop light (so I can control the amps)

Re: Where can I get a dumb battery charger? [Re: Chris142] #5264194 11/11/19 12:59 PM
Joined: Apr 2008
Posts: 13,753
M
Miller88 Offline
Offline
M
Joined: Apr 2008
Posts: 13,753
I have one from harbor freight but can't find it. So to get my "smart" charger to work I hooked up a good battery to a dead battery with jumper cables and then started the charging.


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264208 11/11/19 01:14 PM
Joined: Nov 2011
Posts: 1,936
A
Audios Offline
Offline
A
Joined: Nov 2011
Posts: 1,936
You can trick the smart ones by using another battery with booster cables, usually you can slam it for about 15 mins and then remove the good battery from the loop. If theres no readout checking with a voltmeter would be a good idea to get an idea of where the battery is at after a while. I can do this with my Snap on D tac charger, if it sees a decent battery it can throw 80 amps at it, and most times when he good battery is removed youll see a pretty steep drop off in the amp output. However, it has brought back many batteries that have worked for me long term.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264252 11/11/19 02:00 PM
Joined: Mar 2012
Posts: 1,665
E
E150GT Offline
Offline
E
Joined: Mar 2012
Posts: 1,665
Walmart, Or I got mine at Norther Tool. I really only use it to remove rust from my cast iron.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 68k 5w30
2006 Buick Lucerne CXL 3.8 40k 5w30
Re: Where can I get a dumb battery charger? [Re: Chris142] #5264298 11/11/19 02:41 PM
Joined: Mar 2008
Posts: 6,520
B
bubbatime Offline
Offline
B
Joined: Mar 2008
Posts: 6,520
Most of these smart chargers have a way to bypass this "safety" to get them to start pumping out voltage, if you read the manual.

If not, I hooked the used battery up to a good battery via jumper cables, and then you can start pumping voltage into it.


2019 Honda CRV 1.5T factory bulk
2017 Chrysler Pacifica SuperTech synthetic 5W20
2013 Yamaha XT250 Valvoline motorcycle 10W40
2006 GMC Sierra SuperTech high mileage 5W30

Re: Where can I get a dumb battery charger? [Re: Chris142] #5264312 11/11/19 02:51 PM
Joined: Aug 2011
Posts: 2,426
B
Blkstanger Offline
Offline
B
Joined: Aug 2011
Posts: 2,426
I bought a cheap Harbor Freight charger. Works great.


99 Jeep WJ 4.7 200,000mi. Maxlife 10w30, Fram Ultra.
15 Ford Escape S 2.5
Re: Where can I get a dumb battery charger? [Re: mk378] #5264365 11/11/19 04:20 PM
Joined: Sep 2015
Posts: 4,345
69GTX Offline
Offline
Joined: Sep 2015
Posts: 4,345
Originally Posted by mk378
Looks like they still make the Schumacher SE-5212A. You want the A one with an analog meter on the front not the E one with LEDs. I have an old SE-3005 which is very similar and it will revive (or attempt to) batteries that are run down to zero.


I use a similar Schumacher marine battery charger. I think it only cost around $25-$40 new. Had it for 15-20 yrs, not really sure. It has brought back several nearly dead batteries. I think in one case I charged continuously for 8 hours. Got 3 more years out of that one. Just clip it on and go. The only glitch with mine is that if you exceed the full scale amp charging rate (10+ amps) it will kick you out on over load. In those cases changing the ground can lessen the charge rate to get you going.


----------------

2001 Lincoln Cont 4.6L DOHC/ 50K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Page 1 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™