Battery tender or disconnect battery? - LotusTalk - The Lotus Cars Community
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post #1 of 22 (permalink) Old 10-10-2015, 12:51 PM Thread Starter
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Battery tender or disconnect battery?

My 2011 Elise will be idle for about three weeks. I have left it for over a week with no problems but am condsidering getting a battery tender to be safe.

First, is this a better solution than just disconnecting the battery (do I have to recode the key/immobilizer)?

Second, I had thought of getting a Deltran tender but Amazon will not ship in California. What do people think of the CTEK (56-864)?
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post #2 of 22 (permalink) Old 10-10-2015, 01:22 PM
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My 2011 Elise will be idle for about three weeks. I have left it for over a week with no problems but am condsidering getting a battery tender to be safe.

First, is this a better solution than just disconnecting the battery (do I have to recode the key/immobilizer)?

Second, I had thought of getting a Deltran tender but Amazon will not ship in California. What do people think of the CTEK (56-864)?
I have a battery switch and a tender. Post your location. I'm in CA and have an extra Deltran. Never heard anyone badmouth the Deltran.

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post #3 of 22 (permalink) Old 10-10-2015, 01:31 PM
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Originally Posted by John Kaufman View Post
My 2011 Elise will be idle for about three weeks. I have left it for over a week with no problems but am condsidering getting a battery tender to be safe.

First, is this a better solution than just disconnecting the battery (do I have to recode the key/immobilizer)?

Second, I had thought of getting a Deltran tender but Amazon will not ship in California. What do people think of the CTEK (56-864)?
I wouldn't disconnect the battery and instead just hook up a battery tender. Simple to install and easy to plug in.

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post #4 of 22 (permalink) Old 10-10-2015, 01:56 PM
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My car came with a CTEK, it's worked fine for the last 2-3 years.
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post #5 of 22 (permalink) Old 10-10-2015, 02:29 PM
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?. . . is this a better solution than just disconnecting the battery (do I have to recode the key/immobilizer)?
You won't have to re-code the alarm system if you disconnect the battery.

Deltran makes a good product. Try their store locator to find a local retailer - lots of auto parts stores carry Deltran.

My 2011 lasts about ten days (with the alarm off) before it kills a lead acid battery, so you will want to do something. I have a lithium ion battery now and a battery disconnect - I just disconnect the battery for storage.

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post #6 of 22 (permalink) Old 10-10-2015, 02:33 PM
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I've found the best price for the Deltran is at Sears (Auto) when they have blowout sales. Paid $20 for the last one I picked up.

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post #7 of 22 (permalink) Old 10-10-2015, 04:51 PM
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In my experience, battery disconnect only works for about a year or two for an occasionally driven car.
I use deltran, but CTEK makes good stuff I hear. Their product gets relabeled as OEM accessory for many European car manufacturers.
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post #8 of 22 (permalink) Old 10-10-2015, 06:37 PM
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In my experience, battery disconnect only works for about a year or two for an occasionally driven car.
Huh? What happens after a year or two?

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post #9 of 22 (permalink) Old 10-10-2015, 06:55 PM
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I have had only one issue when leaving mine to sit for long periods. I had surgery and the car sat for a month. It started fine but I coul d not drive yet. My surgery failed and I had to go back in the hospital to redo the surgery. It sat another 6 weeks and I did have to recharge it at that time.

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post #10 of 22 (permalink) Old 10-10-2015, 07:07 PM
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I use a small battery. They don't like to hold charge as well as when it was new probably due to sulfation.
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post #11 of 22 (permalink) Old 10-11-2015, 06:36 AM
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I've found the best price for the Deltran is at Sears (Auto) when they have blowout sales. Paid $20 for the last one I picked up.
Ditto! Seems they do that every so often.

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post #12 of 22 (permalink) Old 10-11-2015, 07:54 AM
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You won't have to re-code the alarm system if you disconnect the battery.

Deltran makes a good product. Try their store locator to find a local retailer - lots of auto parts stores carry Deltran.

My 2011 lasts about ten days (with the alarm off) before it kills a lead acid battery, so you will want to do something. I have a lithium ion battery now and a battery disconnect - I just disconnect the battery for storage.

Glen
Disconnecting you bat does not lose the alarm system code lol
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post #13 of 22 (permalink) Old 10-11-2015, 11:33 AM Thread Starter
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Thanks for the feedback on battery tenders. I did check out Sears. They had a good price, under $20 but there is no store near me with one and the company that fulfills the order is out of state and can not ship to California. Ended up getting the CTEK since I need it right away.
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post #14 of 22 (permalink) Old 10-11-2015, 07:58 PM
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good that you got a battery tender.

Much more convenient than having to deal with disconnecting the battery, plus I think it also helps maintain the radio station presets.

I use a Cigarette lighter adapter with my chargers as well, which is even more convenient (provided I make sure it's properly seated inside the Acc lighter port)
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post #15 of 22 (permalink) Old 10-12-2015, 06:09 AM
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I have a battery kill switch...best thing ever if you store your vehicle for any extended period and I park my car no where near an outlet
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post #16 of 22 (permalink) Old 10-12-2015, 09:27 AM
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I usually disconnect and give it a trickle charge before reconnecting.
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post #17 of 22 (permalink) Old 10-12-2015, 11:14 AM
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I have a battery kill switch...best thing ever if you store your vehicle for any extended period and I park my car no where near an outlet
Where do you park? outside?
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post #18 of 22 (permalink) Old 10-12-2015, 12:07 PM
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I was about to post the same question, but my car will be in storage for 3-6 months and the closest outlet is 100 feet away. I'm 90% sure I'll just be disconnecting the battery for a while. I have a LiOn battery though so I think I should probably remove it entirely from the car and keep it on a tender in my office.
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post #19 of 22 (permalink) Old 10-12-2015, 01:14 PM
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fyi:

Deltran and others make solar-powered chargers. No idea of efficacy.

Also, letting a normal battery go flat reduces its life span significantly.

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post #20 of 22 (permalink) Old 10-12-2015, 06:37 PM
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@LiveToDrive . I have a lithium ion battery (Chimera) and simply disconnect the positive lead for the long winters here in Buffalo. I reconnect in the Spring and it turns right over.
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