Battery tender

wheezyF · 09-15-2022, 11:40 AM

My car sits in the garage for long periods of time. Can anyone recommend a battery tender that they use?

Much appreciated.

DRLane · 09-15-2022, 12:05 PM

https://www.amazon.com/CTEK-40-206-5...6060&psc=1

Vuu · 09-15-2022, 12:06 PM

Quote:

Originally Posted by wheezyF

My car sits in the garage for long periods of time. Can anyone recommend a battery tender that they use?

Much appreciated.

https://www.amazon.com/Battery-Tende...=AC0UA62Z9ZBMG

This is the one I use and have used for like 7 years now.

wheezyF · 09-15-2022, 01:13 PM

Thank you, I don't think I can go wrong with either one

GeoK · 09-15-2022, 01:43 PM

In case you have a Costco membership, check product 1385392, currently for $40.
Had it for two years with zero issues.
https://www.costco.com/battery-tende...100679769.html

Davisca455 · 09-15-2022, 02:22 PM

I use this one.
I'm not a battery guru, but someone told me it has some beneficial mode (desulfide?), that helps with overall battery health.

spammysammich · 09-15-2022, 02:30 PM

Quote:

Originally Posted by wheezyF

Thank you, I don't think I can go wrong with either one

Whatever you choose make sure it has an AGM charging mode if you have an AGM battery.

nrubenstein · 09-15-2022, 03:02 PM

FWIW, I'm not a huge fan of permanent tender use. I've had a Battery Tender brand tender fail and boil over a batter. Also, in 993 land, ever since battery tenders got common, DME failure became a lot more common. At the very least, you should have a tender run through a surge protector if you insist on leaving it plugged in long term.

Edit: For the record, I'm currently using a NOCO genius charger. I've thrown out all my Battery Tenders, and the CTEK has suffered from the usual button failure that makes it useless.

MechEngineer408 · 09-15-2022, 03:10 PM

I have the CTEK MUS 7002. No issues in 4 years of use.

djschmitt · 09-15-2022, 04:05 PM

Quote:

Originally Posted by MechEngineer408

I have the CTEK MUS 7002. No issues in 4 years of use.

+1

wheezyF · 09-15-2022, 05:26 PM

Quote:

Originally Posted by nrubenstein

FWIW, I'm not a huge fan of permanent tender use. I've had a Battery Tender brand tender fail and boil over a batter. Also, in 993 land, ever since battery tenders got common, DME failure became a lot more common. At the very least, you should have a tender run through a surge protector if you insist on leaving it plugged in long term.

Edit: For the record, I'm currently using a NOCO genius charger. I've thrown out all my Battery Tenders, and the CTEK has suffered from the usual button failure that makes it useless.

Thanks for the insight. I hope to drive the car more often but I will be using a surge protector when I do leave the car on the tender.

///M Power-Belgium · 09-15-2022, 07:17 PM

10 Years with my CTEK .. Zero issues ! ( see pic. )
Leno speaks as well ...

Frostynorth · 09-15-2022, 08:47 PM

CTEK - 40-206 MXS 5.0

Leave it on all winter, it's not a fast charger steps 6-8 can take awhile.

jayzbird · 09-19-2022, 10:57 PM

Doesn’t get much easier than this. Battery tracker tucked in there to monitor health.

redline9001 · 09-20-2022, 09:51 PM

I use a bmw branded ctek … I just replaced my mar 2010 battery in my m3 last month … my car has only 36k km on it. Battery tenders rule ….

brettcp · 09-21-2022, 03:36 PM

Quote:

Originally Posted by DRLane

https://www.amazon.com/CTEK-40-206-5...67516060&psc=1

This is the one I use on my M3, works great.

mnsailor · 09-21-2022, 10:01 PM

I plan on using a battery maintainer over the winter. Should I connect directly to the battery in the trunk or is it ok to hook up to the connections under the hood?

Frostynorth · 09-21-2022, 10:05 PM

Under the hood. It's keeps the battery management circuits in play.

AndyBrad · 09-22-2022, 03:34 AM

under the bonnet is easiest but as long as you put the negative to a ground point and not the negative battery terminal

TheM3Chase · 09-22-2022, 12:11 PM

I use a Schumacher branded one and leave it on the AGM setting at 3 AMPs. I have been using it for the past 5 years and it's been great. Under the hood!

09-15-2022, 11:40 AM	#1
wheezyF Private First Class 60 Rep 100 Posts Drives: e92 m3 Join Date: Aug 2019 Location: Socal iTrader: (0)	Battery tender My car sits in the garage for long periods of time. Can anyone recommend a battery tender that they use? Much appreciated.
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09-15-2022, 12:05 PM	#2
DRLane Brigadier General 3986 Rep 3,408 Posts Drives: E92 M3 Join Date: Oct 2018 Location: Colorado iTrader: (21) Garage List 2008 m3 [6.63]	https://www.amazon.com/CTEK-40-206-5...6060&psc=1 __________________ Not a Doctor, those are just my initials.
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09-15-2022, 01:13 PM	#4
wheezyF Private First Class 60 Rep 100 Posts Drives: e92 m3 Join Date: Aug 2019 Location: Socal iTrader: (0)	Thank you, I don't think I can go wrong with either one
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09-15-2022, 01:43 PM	#5
GeoK Private First Class 105 Rep 112 Posts Drives: 2013 E92 M3 Join Date: Nov 2020 Location: Cincinnati, OH iTrader: (1) Garage List 2013 M3 COUPE (E92) [9.00]	In case you have a Costco membership, check product 1385392, currently for $40. Had it for two years with zero issues. https://www.costco.com/battery-tende...100679769.html
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09-15-2022, 02:22 PM	#6
Davisca455 Captain 2208 Rep 865 Posts Drives: 2008 M3 Join Date: Oct 2012 Location: Davis, California iTrader: (0)	I use this one. I'm not a battery guru, but someone told me it has some beneficial mode (desulfide?), that helps with overall battery health. Attached Images __________________ Chris, 2008 E92
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09-15-2022, 03:02 PM	#8
nrubenstein Captain 567 Rep 801 Posts Drives: E30 M3/E36 M3/E46 M3/E90 M3 Join Date: Dec 2016 Location: Washington, DC iTrader: (2)	FWIW, I'm not a huge fan of permanent tender use. I've had a Battery Tender brand tender fail and boil over a batter. Also, in 993 land, ever since battery tenders got common, DME failure became a lot more common. At the very least, you should have a tender run through a surge protector if you insist on leaving it plugged in long term. Edit: For the record, I'm currently using a NOCO genius charger. I've thrown out all my Battery Tenders, and the CTEK has suffered from the usual button failure that makes it useless. __________________ 2011.75 E90 M3 \| 2006 GMC Sierra LBZ \| 2004 X5 3.0i 6MT \| 1995 M3 S50B32 \| 1990 325is \| 1989 M3 S54B32 Hers: 1996 911 Turbo \| 1989 325iX
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09-15-2022, 03:10 PM	#9
MechEngineer408 Private First Class 204 Rep 174 Posts Drives: 2013 E92 M3 Join Date: Oct 2018 Location: San Jose, CA iTrader: (1)	I have the CTEK MUS 7002. No issues in 4 years of use.
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09-15-2022, 07:17 PM	#12
///M Power-Belgium General 63080 Rep 24,611 Posts Drives: ///M3-E92-DCT Silverstone II Join Date: Jul 2012 Location: Belgium iTrader: (0)	10 Years with my CTEK .. Zero issues ! ( see pic. ) Leno speaks as well ... Attached Images __________________ "MAX VERSTAPPEN" IS THE 2021+2022+2023 F1 WORLD CHAMPION - #UnLeashTheLion BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod.
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09-15-2022, 08:47 PM	#13
Frostynorth Weirdo 431 Rep 182 Posts Drives: 2011 e92 M3 Join Date: Jun 2020 Location: Middle of nowhere iTrader: (0)	CTEK - 40-206 MXS 5.0 Leave it on all winter, it's not a fast charger steps 6-8 can take awhile.
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09-19-2022, 10:57 PM	#14
jayzbird Private 35 Rep 58 Posts Drives: E90 M3 Join Date: Sep 2019 Location: Ca iTrader: (0)	Doesn’t get much easier than this. Battery tracker tucked in there to monitor health. Attached Images
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09-20-2022, 09:51 PM	#15
redline9001 Captain 223 Rep 979 Posts Drives: E92 M3, F15 X5, G14 F150 Join Date: Apr 2011 Location: Calgary, Canada iTrader: (0)	I use a bmw branded ctek … I just replaced my mar 2010 battery in my m3 last month … my car has only 36k km on it. Battery tenders rule …. __________________ 2011 E92 M3 \| JEREZ BLACK \| EXTENDED BAMBOO NOVILLO \| EXECUTIVE PKG \| M-DRIVE \| EDC \| M-DCT MODS \| KW S/O \| HRE P40SC \| Akra Evo \|ESS Akra Tune \| ESS DCT tune \| BMC drop in \| StopTech Trophies \| TMS Pulley \| LUX V3 \| BE Bearings and BE ARP rod bolts
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09-21-2022, 10:01 PM	#17
mnsailor Registered 0 Rep 2 Posts Drives: 2008 BMW E93 Join Date: Jun 2022 Location: Minneapolis iTrader: (0)	I plan on using a battery maintainer over the winter. Should I connect directly to the battery in the trunk or is it ok to hook up to the connections under the hood?
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09-21-2022, 10:05 PM	#18
Frostynorth Weirdo 431 Rep 182 Posts Drives: 2011 e92 M3 Join Date: Jun 2020 Location: Middle of nowhere iTrader: (0)	Under the hood. It's keeps the battery management circuits in play.
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09-22-2022, 03:34 AM	#19
AndyBrad Enlisted Member 34 Rep 41 Posts Drives: M3 e92 Join Date: Feb 2022 Location: West Yorkshire iTrader: (0)	under the bonnet is easiest but as long as you put the negative to a ground point and not the negative battery terminal
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09-22-2022, 12:11 PM	#20
TheM3Chase Private 42 Rep 68 Posts Drives: BMW E92 M3 Join Date: Jan 2022 Location: New Jersey iTrader: (0)	I use a Schumacher branded one and leave it on the AGM setting at 3 AMPs. I have been using it for the past 5 years and it's been great. Under the hood!
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