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CTEK MX5 Battery Charger What Do You Think? #4991516
01/26/19 02:21 PM
01/26/19 02:21 PM
Joined: Sep 2007
Posts: 416
northern NY
Driz Offline OP
Driz  Offline OP

Joined: Sep 2007
Posts: 416
northern NY
I got one a couple months ago looking mainly for the battery desulphation revival use. Something to supplement my 1981 Craftsman rig that’s not a smart charger.
I tried it on a few sort of sick batteries. I have a load tester so know each is just in the green but getting weak. I’ve tried it on 4 so far and tested each before and after letting each sit and do its thing for a few days. Ok it charged them all overnight sure, Beyond that I have to say I’m not impressed . 🤨 They might be somewhat better but every one sure came nowhere near even the middle of that green OK dial . Not one,I’m far from impressed by this thing. What’s anyone elses experiences with with these CTEK rigs. Is there some sort of magic to be had by leaving it on for weeks that I am missing ? The directions are awfully vague🤥

Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991537
01/26/19 02:56 PM
01/26/19 02:56 PM
Joined: Aug 2018
Posts: 112
Central US
bobdoo Offline
bobdoo  Offline

Joined: Aug 2018
Posts: 112
Central US
I have a MUS4.3 and Multi US 25000 8. The small one for cycle/car and the big one for trolling and sump pump batts.

Also a now-unused battery tender, and a variety of 'dumb' chargers.

The Cteks are worth the money. They both have 'reconditioning' choices, which push higher voltage thru the cells to equalize them. This is a big deal, and works shown by my hydrometer before/after testing.

Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991554
01/26/19 03:12 PM
01/26/19 03:12 PM
Joined: May 2013
Posts: 704
Florida
SilverSnake Offline
SilverSnake  Offline

Joined: May 2013
Posts: 704
Florida
I have been using CTEK chargers for years. Currently have the Multi US 7002 and the CTEK MUS 4.3. I use them to maintain healthy batteries not to try to resurrect those that are "sick." Very happy with the results.


2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PUP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991562
01/26/19 03:26 PM
01/26/19 03:26 PM
Joined: Nov 2003
Posts: 3,822
Cape Cod, MA
RF Overlord Offline
RF Overlord  Offline

Joined: Nov 2003
Posts: 3,822
Cape Cod, MA
I have a CTEK Multi US 3300 and it worked a treat on 2 batteries that were left in cars over a winter.


Supercharged '03 Mercury Marauder - Trilogy Motorsports #61
PP 5W-30 / MC FL820S

'04 Grand Marquis LS Limited Edition - daily driver

'00 Grand Marquis GS - bad frame/future to be determined
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991602
01/26/19 04:03 PM
01/26/19 04:03 PM
Joined: Feb 2009
Posts: 1,727
wv
krismoriah72 Offline
krismoriah72  Offline

Joined: Feb 2009
Posts: 1,727
wv
I have the Schumacher SC1319 I have used it and abused it for a couple of years on my UTV, riding mower and also several car batteries. Can be had at tractor supply or amazon for $25.

I always put a multimeter on after the green light kicks and batteries are always fully charged..

Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991664
01/26/19 05:08 PM
01/26/19 05:08 PM
Joined: May 2009
Posts: 740
Hawaii, USA
anndel Offline
anndel  Offline

Joined: May 2009
Posts: 740
Hawaii, USA
I have the Multi US 7200 as well and used it to recharge completely drained (<10.0 V) flooded cell batteries (NORMAL mode) and it worked very well.


1993 Toyota 4x4 p/u, 2.4L 22RE 4 cyl - M1 EP 10W-30, Fram UG Filter
2005 Toyota Avalon XL, 3.5L V6, PP HM 5W-30, Yota OEM Filter
2014 Toyota Tacoma 4.0L V6, Amsoil SS5W-30, Yota OEM Filter
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991672
01/26/19 05:11 PM
01/26/19 05:11 PM
Joined: Jun 2014
Posts: 1,999
Ca.
UncleDave Offline
UncleDave  Offline

Joined: Jun 2014
Posts: 1,999
Ca.
I like my ctek 7002 a lot and ctek in general.

I LOVE my optimate 6's.

UD


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991693
01/26/19 05:23 PM
01/26/19 05:23 PM
Joined: Mar 2012
Posts: 6,232
Colorado Springs
edyvw Offline
edyvw  Offline

Joined: Mar 2012
Posts: 6,232
Colorado Springs
Originally Posted by Driz
I got one a couple months ago looking mainly for the battery desulphation revival use. Something to supplement my 1981 Craftsman rig that’s not a smart charger.
I tried it on a few sort of sick batteries. I have a load tester so know each is just in the green but getting weak. I’ve tried it on 4 so far and tested each before and after letting each sit and do its thing for a few days. Ok it charged them all overnight sure, Beyond that I have to say I’m not impressed . 🤨 They might be somewhat better but every one sure came nowhere near even the middle of that green OK dial . Not one,I’m far from impressed by this thing. What’s anyone elses experiences with with these CTEK rigs. Is there some sort of magic to be had by leaving it on for weeks that I am missing ? The directions are awfully vague🤥

CTEK are made for AGM batteries mostly and gained popularity with BMW owners when BMW went all on AGM.
They are very slow chargers and that is what AGM batteries like.


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: edyvw] #4991700
01/26/19 05:30 PM
01/26/19 05:30 PM
Joined: Oct 2002
Posts: 36,936
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 36,936
Great Lakes
Originally Posted by edyvw
They are very slow chargers
Not all of them. The 7002 can charge at 7A - not super fast, but not exactly slow either.

Quote
and that is what AGM batteries like.
Not true at all. As a matter of fact, an AGM can be charged with a higher rate than a traditional lead acid battery.

If you're just topping off, it doesn't really matter.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991745
01/26/19 06:12 PM
01/26/19 06:12 PM
Joined: Jan 2009
Posts: 6,653
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,653
New England
What makes you trust your load tester for accurate readings?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Quattro Pete] #4991767
01/26/19 06:54 PM
01/26/19 06:54 PM
Joined: Jul 2008
Posts: 1,201
British Columbia, Canada
ecotourist Offline
ecotourist  Offline

Joined: Jul 2008
Posts: 1,201
British Columbia, Canada
Originally Posted by Quattro Pete
As a matter of fact, an AGM can be charged with a higher rate than a traditional lead acid battery.

If you're just topping off, it doesn't really matter.

I have a CTEK Multi US 3300 and recently bought a huge AGM for my BMW. The charger has an AGM setting but the manual is a bit vague about whether you should use that setting or not. And it's not very practical to check with the distributor (Canadian Tire) as the manual suggests. Who would you ask?

So would you charge it on the AGM setting? I was having unexplained and random discharging problems and used the charger a couple of times on the normal Auto battery setting. It seemed to work fine. The random discharging was because the AC fan was running from time to time when the key was off.

I like the CTEK just fine.


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT
Re: CTEK MX5 Battery Charger What Do You Think? [Re: ecotourist] #4991783
01/26/19 07:07 PM
01/26/19 07:07 PM
Joined: Oct 2002
Posts: 36,936
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 36,936
Great Lakes
Originally Posted by ecotourist
I have a CTEK Multi US 3300 and recently bought a huge AGM for my BMW. The charger has an AGM setting but the manual is a bit vague about whether you should use that setting or not. And it's not very practical to check with the distributor (Canadian Tire) as the manual suggests. Who would you ask?

So would you charge it on the AGM setting?

Since not all AGM batteries are the same, I would probably ask the battery manufacturer. This is from an FAQ on CTEK's website:
Quote
Q. I have an AGM battery. Do I charge it in snowflake mode?
A. It depends. Optima and Hawker recommend snowflake mode. If there is no indication on the battery, use car mode for batteries over 14Ah or MC mode for batteries under 14Ah.

And if the ambient temp during battery charging is below 41F, I would charge it in "snowflake mode", regardless if it was lead acid or AGM, as per the owner's manual.

Is this battery for your 528i? Which specific battery did you get? I'm going to probably need a new battery for my 530i soon, and still debating whether to get AGM (probably Bosch) or another lead-acid one. My car seems to constantly undercharge the battery, and I don't know if getting AGM is going to make things worse or better.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4991792
01/26/19 07:14 PM
01/26/19 07:14 PM
Joined: Mar 2004
Posts: 21,614
Upstate NY
Donald Online content
Donald  Online Content

Joined: Mar 2004
Posts: 21,614
Upstate NY
I have only used Battery Minder chargers and maintainers. I think they have sophisticated desulfation circuits. But in emails they said it can take weeks.

I am not saying desulfation is a hoax, but I think the battery has to be a good candidate for desulfation and I am guessing not all batteries are. And I do not know what makes a good candidate and how to tell.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Quattro Pete] #4991812
01/26/19 07:29 PM
01/26/19 07:29 PM
Joined: Jul 2008
Posts: 1,201
British Columbia, Canada
ecotourist Offline
ecotourist  Offline

Joined: Jul 2008
Posts: 1,201
British Columbia, Canada
Originally Posted by Quattro Pete
Since not all AGM batteries are the same, I would probably ask the battery manufacturer. This is from an FAQ on CTEK's website:
Quote
Q. I have an AGM battery. Do I charge it in snowflake mode?
A. It depends. Optima and Hawker recommend snowflake mode. If there is no indication on the battery, use car mode for batteries over 14Ah or MC mode for batteries under 14Ah.

And if the ambient temp during battery charging is below 41F, I would charge it in "snowflake mode", regardless if it was lead acid or AGM, as per the owner's manual.

Is this battery for your 528i? Which specific battery did you get? I'm going to probably need a new battery for my 530i soon, and still debating whether to get AGM (probably Bosch) or another lead-acid one. My car seems to constantly undercharge the battery, and I don't know if getting AGM is going to make things worse or better.

Yes it's for the 528i. My battery failed during the free replacement warranty period - and the AGM battery (on sale) was a few cents less than the regular price on the battery I had installed (which they didn't have in stock anyway). So I got an AGM by default. It is the recommended battery for my BMW and the regular price is a lot more than the lead acid battery it replaced. It's too soon to say anything much about it. But with the random discharging (hopefully) corrected it should be fine.


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Donald] #4991815
01/26/19 07:30 PM
01/26/19 07:30 PM
Joined: Oct 2002
Posts: 36,936
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 36,936
Great Lakes
Originally Posted by Donald
I have only used Battery Minder chargers and maintainers. I think they have sophisticated desulfation circuits. But in emails they said it can take weeks.
Yeah, I had my BatteryMinder 2012 hooked up to my car battery for weeks once, and the desulfation light never stopped flashing. No idea if it ever actually helped the battery in any way.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: ecotourist] #4991818
01/26/19 07:32 PM
01/26/19 07:32 PM
Joined: Oct 2002
Posts: 36,936
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 36,936
Great Lakes
Originally Posted by ecotourist
It is the recommended battery for my BMW

I was hoping you could say who makes this battery or its brand. Or is it some Canadian Tire private label?


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992090
01/27/19 04:27 AM
01/27/19 04:27 AM
Joined: Sep 2007
Posts: 416
northern NY
Driz Offline OP
Driz  Offline OP

Joined: Sep 2007
Posts: 416
northern NY
So far with mine I see it just hits de sulfate then continues on till done . Never saw it but one time had gone back to desulphate but who knows nobody is standing there watching it and it’s automatic.
At best I can agree with the leave it on for weeks thing as possibly being more effective as I haven’t done that yet. Maybe later on I’ll change my mind and then I’ll jump for joy but certainly not holding my breath.
As for not trusting my load tester why wouldn’t I? It’s nothing but a carbon pile and even if the meter is calibrated off a bit it’s still gonna maintain the same relationship opposed to the prior reading.
I left it with my buddy for a month who has a weak battery in his backhoe. I laughingly told him he 🤥owes me big when I come back and he has 🤗🌈 cured his tired gazillion dollar battery. He will probably throw it at me when I see him again.

Re: CTEK MX5 Battery Charger What Do You Think? [Re: Quattro Pete] #4992285
01/27/19 09:34 AM
01/27/19 09:34 AM
Joined: Jul 2008
Posts: 1,201
British Columbia, Canada
ecotourist Offline
ecotourist  Offline

Joined: Jul 2008
Posts: 1,201
British Columbia, Canada
Originally Posted by Quattro Pete
I was hoping you could say who makes this battery or its brand. Or is it some Canadian Tire private label?
Yes it's a Canadian Tire private label, a MotoMaster Eliminator Ultra AGM, rated at 920 Cold Cranking Amps. Made in the USA. The regular price for that battery for the 528i is $260 (Canadian). It has a 5 year free replacement warranty.


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992406
01/27/19 12:11 PM
01/27/19 12:11 PM
Joined: Feb 2013
Posts: 1,188
Prospect, KY
spk2000 Offline
spk2000  Offline

Joined: Feb 2013
Posts: 1,188
Prospect, KY
I have one of these stanley chargers and love it. Digital displays tells how much power it's putting in the battery. I do know it will not charge a completely dead battery. If it does not sense some voltage it doesn't work where my 20 year old schumacher does. I have 2 walmart 2 year batteries from Aug 2012 still going

https://www.walmart.com/ip/Stanley-...ttery-Charger-3-Amp-Maintainer/749526811


96 Grand Marquis
01 Sable LS
02 Montero
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Quattro Pete] #4992457
01/27/19 01:13 PM
01/27/19 01:13 PM
Joined: Mar 2012
Posts: 6,232
Colorado Springs
edyvw Offline
edyvw  Offline

Joined: Mar 2012
Posts: 6,232
Colorado Springs
Originally Posted by Quattro Pete
Originally Posted by edyvw
They are very slow chargers
Not all of them. The 7002 can charge at 7A - not super fast, but not exactly slow either.

Quote
and that is what AGM batteries like.
Not true at all. As a matter of fact, an AGM can be charged with a higher rate than a traditional lead acid battery.

If you're just topping off, it doesn't really matter.

IDK, there is a guy on bimmerfest who is engineer with experience in these stuff that argues that slower the charging the better it is for AGM.
Really never made too much focus on this charging issue, but I always used 4A on my battery tender when hooked up on BMW.


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: krismoriah72] #4992465
01/27/19 01:21 PM
01/27/19 01:21 PM
Joined: Sep 2010
Posts: 8,023
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,023
Texas
Originally Posted by krismoriah72
I have the Schumacher SC1319 I have used it and abused it for a couple of years on my UTV, riding mower and also several car batteries. Can be had at tractor supply or amazon for $25.

I always put a multimeter on after the green light kicks and batteries are always fully charged..


Only brand I have … 20 year old Farm & Ranch model just did garden tractor … also have their marine trickle chargers and static/load tester …

Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992506
01/27/19 01:45 PM
01/27/19 01:45 PM
Joined: Oct 2010
Posts: 1,833
california
wrcsixeight Offline
wrcsixeight  Offline

Joined: Oct 2010
Posts: 1,833
california
Unless you're using 2 multimeters. One showing voltage, and the other one amperage. You cannot discern full charge.

Voltage only corresponds to state of charge on a battery that has not seen charging or discharging currents for a good period of time.
And is still not always accurate. And each battery can vary as to full charge resting voltage despite the broad brushes painted by many.

Surface charge retention can vary greatly with the battery, its health. Temperature and who made it. To what standard and what alloy was used in the plate paste.

So you cant just put a voltmeter on a battery fresh off the charger and declare it is fully charged. A high voltage 24 hours later is a much better indicator. Especially with previous measurements on that specific battery when newer. But fresh off the charger? No. Not possible.

Charged enough? Good enough? Subjectively yes.
But true full charge? No. Absolutely no.


LA 318 Roller Cam
Pennzoil Platinum 10w-30 SN Plus
Fram ultra XG8A
Fram Ultra XG16 on remote transmission filter mount
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992920
01/27/19 07:29 PM
01/27/19 07:29 PM
Joined: Oct 2010
Posts: 1,833
california
wrcsixeight Offline
wrcsixeight  Offline

Joined: Oct 2010
Posts: 1,833
california
Unless you're using 2 multimeters. One showing voltage, and the other one amperage. You cannot discern full charge.

Voltage only corresponds to state of charge on a battery that has not seen charging or discharging currents for a good period of time.
And is still not always accurate. And each battery can vary as to full charge resting voltage despite the broad brushes painted by many.

Surface charge retention can vary greatly with the battery, its health. Temperature and who made it. To what standard and what alloy was used in the plate paste.

So you cant just put a voltmeter on a battery fresh off the charger and declare it is fully charged. A high voltage 24 hours later is a much better indicator. Especially with previous measurements on that specific battery when newer. But fresh off the charger? No. Not possible.

Charged enough? Good enough? Subjectively yes.
But true full charge? No. Absolutely no.


LA 318 Roller Cam
Pennzoil Platinum 10w-30 SN Plus
Fram ultra XG8A
Fram Ultra XG16 on remote transmission filter mount
Re: CTEK MX5 Battery Charger What Do You Think? [Re: edyvw] #4993018
01/27/19 08:54 PM
01/27/19 08:54 PM
Joined: Aug 2018
Posts: 112
Central US
bobdoo Offline
bobdoo  Offline

Joined: Aug 2018
Posts: 112
Central US
Originally Posted by edyvw

CTEK are made for AGM batteries mostly and gained popularity with BMW owners when BMW went all on AGM.
They are very slow chargers and that is what AGM batteries like.


This is not true. Why are you posting lies?

Re: CTEK MX5 Battery Charger What Do You Think? [Re: bobdoo] #4993141
01/28/19 12:07 AM
01/28/19 12:07 AM
Joined: Mar 2012
Posts: 6,232
Colorado Springs
edyvw Offline
edyvw  Offline

Joined: Mar 2012
Posts: 6,232
Colorado Springs
Originally Posted by bobdoo
Originally Posted by edyvw

CTEK are made for AGM batteries mostly and gained popularity with BMW owners when BMW went all on AGM.
They are very slow chargers and that is what AGM batteries like.


This is not true. Why are you posting lies?

OK, tell us than what is truth?


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4993378
01/28/19 09:07 AM
01/28/19 09:07 AM
Joined: Feb 2007
Posts: 3,753
Southeast
meep Offline
meep  Offline

Joined: Feb 2007
Posts: 3,753
Southeast
I built a couple of desulfators a long time ago. For them to truly work, they need to be left on for a couple of months in deeply sulfated batteries. Mine reached up to 60V peaks in the 1khz spike in batteries which were badly sulfated (high internal resistance). This meant 2 things - it could damage other things connected to the battery, such as an automatic charger, and other connected devices with any capacitance would dampen the signal. So - in my experience, real desulfation can't be done in the car, and takes a long time. I suspect that anything we buy claiming it does desulfation would probably be pretty anemic, as to not damage vehicle electronics, and also even further anemic once connected to a battery installed in a vehicle.

And the results were mixed. I did see some improvement in some batteries, but not all.


2018 F150
2015 crv (wifey!)
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #5008464
02/11/19 11:33 PM
02/11/19 11:33 PM
Joined: Jan 2017
Posts: 80
Fl
carloz Offline
carloz  Offline

Joined: Jan 2017
Posts: 80
Fl
I have a ctek also and have no complaints. I use it whenever I can't drive my car for a week or more.

Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #5009351
02/12/19 08:18 PM
02/12/19 08:18 PM
Joined: Aug 2018
Posts: 112
Central US
bobdoo Offline
bobdoo  Offline

Joined: Aug 2018
Posts: 112
Central US
If the batteries are at the end of their life, NO charger will fix them.

Having said that, does your charger allow for 'reconditioning', which will attempt to balance the charge state of all cells (you can verify with a hydrometer)? That *will* help.

I've got 2 Cteks, and a Battery Tender. Plus a string of cheap, dumb chargers that I threw out. The Cteks charge all my batteries now.

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