Thread: Rejuvenation battery charging cycle

what brand charger?

i do my batteries on the rejuvenation if have been deeply discharged.
no idea if it does any damage.

go it. the only time it will give issues is if the battery is low on electrolyte or the AGM has outgassed excessively.

Originally Posted by Eevo

what brand charger?

Projecta

Hi Ferret, check the maximum voltage level while the charger is reconditioning the battery.

If you are working with AGMs ( except Optimas ) the chargers voltage must not exceed 14.7v, or as dave indicated, you will cause the AGM to gas.

Again, if you can set the charger to operate at 14.7v, you can recondition an AGM and equalise it's cells.

With Optimas, you can go to 15.1.

And wet cells can go to 15.5 or higher, for short periods.

Originally Posted by drivesafe

Hi Ferret, check the maximum voltage level while the charger is reconditioning the battery.

If you are working with AGMs ( except Optimas )

With Optimas, you can go to 15.1.

Can you expand on that a bit? I thought Optimas were AGMs, albeit with the spiral thingy. My D2 has Yellow Tops, and it has been OTR for around six months or more. Can I just use my little CTEK rejuve charger on them?

Hi again John, and unfortunately, just like oils ain't oils, batteries are not the same, even when they appear to be called the same.

If you have a battery that you are not sure about the specs for it, go to that specific battery's manufacturers web site and check for the correct specs.

NOTE, even when on the correct manufacturer's web site you MUST have the correct battery model to be able to get the accurate info for your specific battery.

Most modern AGMs have a maximum safe voltage tolerance of 14.7v.

But Optima batteries have a safe maximum voltage tolerance of 15.1v.

Again, you need to know the exact specs for your specific battery.

I've recently thrown out two 100 ah AGMs from a Pioneer camper where the owner had left the Ctek charger on 'reconditioning' cycle. A bugger of a job as it was a major exercise to get to one of the batterys. Also an expensive fix.

Why would you want to 'rejuvenate' a perfectly good battery in the first place ?

Rejuvenation/desulphation is for restoring 'sulphated' batterys to capacity. If the battery is kept in good charged condition and delivers good capacity there's no need to rejuvenate it. All this does is stress the battery for no good purpose. IMO the rejuvenation mode should not be seen a 'may as well' maintenance cycle to help keep the battery in good condition but used as a repair cycle to help desulphate a degraded battery.

Deano

Looks like its battery day today! Just tracked down a new battery for my 2013 RRS 3.0 SDV6, it was hard to search for a replacement online but ended up with a VARTA AGM, from Every Battery that does the trick and seems to be better quality than the original Exide (and much cheaper than a factory replacement, at $430)

Arrived home then for a bit of recreation on the Series 2a, to find a dead battery which is also refusing to charge on the smart charger. It is a relatively el cheapo "Super Charge".

Think I might get an Optima- any ideas if Red Top (starting battery) or Yellow Top (starting and deep cycle)? She has a dynamo.

cheers