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Re: CTEK MX5 Battery Charger What Do You Think? [Re: ecotourist] #4991818 01/26/19 08:32 PM
Joined: Oct 2002
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Quattro Pete Offline
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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?


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992090 01/27/19 05:27 AM
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Posts: 885
Driz Offline OP
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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 10:34 AM
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ecotourist Offline
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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 M Sport
2007 Honda Accord EX-L 4Door V6 6MT
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992406 01/27/19 01:11 PM
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spk2000 Offline
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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 203,000 mi
01 Sable LS Wagon 163,000 mi
02 Montero 191,000 mi
03 Sable LS Sedan 73,000 mi
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Quattro Pete] #4992457 01/27/19 02:13 PM
Joined: Mar 2012
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edyvw Offline
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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.


11' BMW 328i xDrive 6MT (Pennzoil Platinum Euro 5W40+ MANN filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OE filter).
Re: CTEK MX5 Battery Charger What Do You Think? [Re: krismoriah72] #4992465 01/27/19 02:21 PM
Joined: Sep 2010
Posts: 12,851
4WD Online Confused
Online Confused
Joined: Sep 2010
Posts: 12,851
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 02:45 PM
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wrcsixeight Offline
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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.



Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4992920 01/27/19 08:29 PM
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wrcsixeight Offline
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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.



Re: CTEK MX5 Battery Charger What Do You Think? [Re: edyvw] #4993018 01/27/19 09:54 PM
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bobdoo Offline
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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 01:07 AM
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edyvw Offline
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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?


11' BMW 328i xDrive 6MT (Pennzoil Platinum Euro 5W40+ MANN filter)
11' VW Tiguan 2.0T (Castrol 0W30+OE filter)
15' Toyota Sienna AWD (Mobil1 5W30 EP+OE filter).
Re: CTEK MX5 Battery Charger What Do You Think? [Re: Driz] #4993378 01/28/19 10:07 AM
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meep Offline
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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 02/12/19 12:33 AM
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carloz Offline
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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 09:18 PM
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bobdoo Offline
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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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