Will 812 battery tender also work for a 488?

Yes.

 

Im pretty sure all 812 have start/ stop which means AGM battery. If the 488 has start/ stop then it should work. If the 488 does not have start/stop I would not use it.


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Why? AGM and lead acid are the same thing basically and use the same setting on my (non Ferrari mind you but still) Battery Tender.

The only reason not to use the same tender/charger would be if the connector was not compatible or if one of the cars had a Lithium (Antigravity for example) battery- in which case it would not work and should not be used.

 

Cool- Can't think of any reason at all then why you can't use the spare 812 tender/charger on the 488.

Besides- If for some reason there was an issue most modern tenders/chargers have intelligence and fail safes built in that would flash an error condition or simply not charge. If the lights come on properly I'm sure you are good.

Cheers

 

Im pretty sure

You shouldn't be doing that. AGM and regular lead acid charge at (slightly) different voltages and rates. Charging an AGM battery with a "regular" lead acid battery tender can damage it.

 

Not according to Battery Tender - 2 settings- One for AGM/Lead Acid (flooded) and one for Lithium- Period. Maybe they can detect the slight differences and accommodate for them in the AGM/Lead acid (flooded) setting- but they clearly state and support the two settings. I know of no Battery Tender product that differentiates between AGM and flooded- None.

Cheers

 

Ctek- who makes tenders for several manufacturers- has and recommends different modes for the different batteries. In the past my mechanic has told me do not use a standard tender for an AGM battery. Hes been at this a long long time.

 

Yes. A 488 maintainer will work on an 812 and an 812 will work on 488.

The lithium ion maintainers will not physically connect
nor would a 488 maintainer connect to a Pista.

The polarity on the connector is opposite to keep you from accidentally connecting in the wrong application.

Steve

 

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Fyi- I don't doubt you or that it's optimal probably- Just saying it's not necessary- Battery Tender has been at it a long time too

Sounds like a great way for CTEK to sell more units

Someone has two cars- one with AGM and one flooded (most people would not know the difference)- Normal people buy one Battery Tender and use on both cars with no issues-

Some people buy two different CTEKs-

God bless em And great for CTEK

 

Indeed.

Though in this case, I don't think its about battery tender sales.

The commercial Ctek tenders let you select a mode like on yours- so they work for any kind of car battery, save for the LiON. It has different user selectable modes, including one for AGM.

The point I am making is back to the original question here.

It depends on which type of battery comes with the car. Because the factory supplied tenders which do not have the user selectable mode. For some time the start stop was an option- I believe they called it HELE. The cars with came with AGM but- the cars without came with an older battery. Thus, its worth checking out, as I think its likely the tenders that came with the non HELE cars would not be set up to charge an AGM battery optimally- as they lack the user selectable mode.

 

I use a CTEK with an AGM battery. The AGM setting uses a slightly higher voltage. If you use a standard charger on an AGM it would not be optimal. Not all AGMs are the same either. You have to check the maximum voltage to make sure the AGM setting on your charger doesn't exceed it.

 

Algar told me the same thing.

 

All of the above is correct and all is wrong. Old, high energy chargers (those big bulky things) charge AGM batteries at too high a rate when you turn the rate up. Too high a voltage and current - and I mean like 20 or 40 or 60 amp charging when the battery is low is very bad for AGM batteries but little concern for standard wet batteries. So yes, "standard" battery chargers, when set to a high rate Can be bad for AGM batteries.

But these small battery charges, regardless of the "type of charger" only charge at 1 or 2 or 4 or 6 amps Maximum and will not hurt your AGM battery.

Battery maintainers generally do not even charge more than 1 to 4 amps at most. But there may be differences in final, voltage maintenance levels. AGM settings generally float the batteries at 13.1v whereas wet cell battery settings end and maintain 12.9v. I actually prefer the 12.9v final float charge when connected to an AGM battery. In the old days all batteries were maintained at 13.8v and that resulted in slowly cooking the electrolyte decreasing battery life SOME.

In conclusion, using a lower level battery charger or maintainer will work on any wet or AGM battery just fine. Some of the newest versions claim all sorts of battery rejuvenation schemes but I am not convinced they do anything at all.

Regardless, I use the CTEK (56-353) MULTI US 7002 12-Volt Battery Charger for all my cars and battery types and run in only the regular wet battery mode.

Ali

PS. This is all for lead batteries only. Lithium batteries require specific chargers for the specific type of lithium batteries.

 

Great addition to the thread, excellent info, thank you