Battery Tender question

togatown · 02-10-2011, 02:22 PM

I keep hearing about "registering" a new battery in a 335 to make sure it charges the battery correctly, and see there is some difference of opinion on this topic. So I am wondering if I am using a battery tender on a 4 year old battery while it is stored for the winter and it takes it back up to a full charge, will I be I fooling the system into thinking the battery is new, and will my alternator now over or under charge it once I start driving it again?

Thanks!

Groganrocket · 02-10-2011, 08:29 PM

Quote:

Originally Posted by dave335eye

I keep hearing about "registering" a new battery in a 335 to make sure it charges the battery correctly, and see there is some difference of opinion on this topic. So I am wondering if I am using a battery tender on a 4 year old battery while it is stored for the winter and it takes it back up to a full charge, will I be I fooling the system into thinking the battery is new, and will my alternator now over or under charge it once I start driving it again?

Thanks!

i have a battery tender on my 2010 335 and no issues.

2kaccordocoupe · 02-10-2011, 08:39 PM

Quote:

Originally Posted by dave335eye

I keep hearing about "registering" a new battery in a 335 to make sure it charges the battery correctly, and see there is some difference of opinion on this topic. So I am wondering if I am using a battery tender on a 4 year old battery while it is stored for the winter and it takes it back up to a full charge, will I be I fooling the system into thinking the battery is new, and will my alternator now over or under charge it once I start driving it again?

Thanks!

No, you will be fine. The tender will just maintain the battery at the current level. As batteries age they loose capacity, the tender will not change that and it will not turn it into a brand new battery.

ENINTY · 02-10-2011, 08:40 PM

Don't worry about it. BMW sells a branded version of the Battery Tender and recommends using one for storage. The Tender will only charge the battery to the state available by the battery. As batteries age they tend to change charging states which the Tender compensates for.

raj55 · 02-11-2011, 03:37 AM

As Eninty said BMW sells C-Tek charger (3600) under its own name. But then you would get it cheaper if you bought a C-Tek charger without the BMW logo.

togatown · 02-11-2011, 12:31 PM

Quote:

Originally Posted by 2kaccordocoupe

No, you will be fine. The tender will just maintain the battery at the current level. As batteries age they loose capacity, the tender will not change that and it will not turn it into a brand new battery.

Damn, I was hoping it was the fountain of youth for my battery, lol! Seriously thanks to all who replied. I just didn't know if the tender would hasten the battery's demise after it saved it during the winter.

stickypaws · 02-11-2011, 12:50 PM

Quote:

Originally Posted by raj55

As Eninty said BMW sells C-Tek charger (3600) under its own name. But then you would get it cheaper if you bought a C-Tek charger without the BMW logo.

+1

I've used CTEK for decades. Top quality Swedish product. And yes, don't buy the Porsche, BMW, or Mercedes branded versions. Go direct: www.ctek.com

02-10-2011, 02:22 PM	#1
togatown Private First Class 3 Rep 102 Posts Drives: 2011 Audi S4 Join Date: Feb 2009 Location: Torrington, CT/Saratoga, NY iTrader: (1)	Battery Tender question I keep hearing about "registering" a new battery in a 335 to make sure it charges the battery correctly, and see there is some difference of opinion on this topic. So I am wondering if I am using a battery tender on a 4 year old battery while it is stored for the winter and it takes it back up to a full charge, will I be I fooling the system into thinking the battery is new, and will my alternator now over or under charge it once I start driving it again? Thanks!
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02-10-2011, 08:40 PM	#4
ENINTY Banned 173 Rep 3,415 Posts Drives: 2006 325i Sport Join Date: Jun 2006 Location: Virginia iTrader: (0)	Don't worry about it. BMW sells a branded version of the Battery Tender and recommends using one for storage. The Tender will only charge the battery to the state available by the battery. As batteries age they tend to change charging states which the Tender compensates for.
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02-11-2011, 03:37 AM	#5
raj55 First Lieutenant 28 Rep 303 Posts Drives: E91 2009, 320i Join Date: Mar 2009 Location: SWEDEN iTrader: (0)	As Eninty said BMW sells C-Tek charger (3600) under its own name. But then you would get it cheaper if you bought a C-Tek charger without the BMW logo.
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