How long should it take to recharge Batt from Low

It can take a good while to charge a battery when it is very low. Depending on the capacity of the charger.

How is it charged?

hi had one of those and it died after 18months. even had it on solar for that long . gone now different brand and made in u.s.a. . best take to a dealer and get it load tested regards morry

I would be investigating what voltage your battery registers when it's charging.

Maîneÿ . . .

A fully discharged battery can take ages to be fully recharged. The internal resistance goes up.

You need to beg borrow or steal a multistage charger and hook it up for a day or two. That is assuming the battery hasn't died.

hi, i have one of those batteries, wont buy another one (nothing but probs- onto my 3rd replacement battery under warranty)! i have it in the back of my rodeo running a 50l fridge. lasts for about 3-4 days depending on ambient temp. i use a 10amp multi stage charge and it takes around 8 hours to get it from 11.8v to full.
Driving can take up to 6-7 hours too off an 80amp alternator through a 120amp isolator! they are a slow charge battery and not designed to have a rapid charge. it would be beneficial to whack it on a multi stage charger every now and then for maintence. i cant get my coloured eye indicator to turn green again, just sits on red even after a full charge, still last a few days running fridge so im happy (waiting for this one to die so i can buy another one of a different brand). guy from battery world reckons if you take your battery below 11.5v it can ruin them, these batteries can take a few discharges below 11.5v but not recommended. The only way the bloke said to me to get the eye green again is to give it a "manual charge" ie special high amped charged designed to pump high current back into it to rejuvinate it, apparently not even the "smartest" automatic multi stage charger can sense when this is required.

I have a 90amp hour, and when low discharged can take 4 to 6 hours or running to fully charge (well to 80%) off the alternator.
Wacks a fair bit of charge in the first 2 hours or so though, but only gets it to about 50% or a bit more.
Fridge is running off the battery as the same time it is being charged, so does take a while.
Also depends what else I am running in the car, with fridges, GPS, charging cameras etc.

Been doing a bit of research on this and found that most new vehicles (TDs in particular) have alternators that drop voltage when crank battery nears full charge. This is no help to a deep cycle aux battery that needs about 14v to get a decent charge. I'm looking at putting in a 12v / 12v charger that boosts the incoming voltage from 12v nominal to the required 14v.

This might be part of your issue.

Thanks to every one for your replys,as i went down to the Batt place and got it tested it just started going Green,he put the meter on it and it was just coming up to charge and he did say they do take awhole to get fully charged up again and running them down this Low is not good,Thanks again for all your help,i'll just have to keep my eyes on it going on the replys.cheers GREENDOG

just remember. Just because you have an 80ampH Alt you maybe using 60 to run the car, maybe 40???Then what's left is yours only.

I would also get a load test done

I would also chuck the multi metre on the dual battery with the cxar running and see what you get, 14.X I hope. The reg maybe seeing a different reading and lowering the voltage of your Alt. Usually you get a good wack of power on the first 50% (maybe) and then it goes down from there as to how much you can cram into the battery, hence the multi stage chargers.

the average n70zz type deep cycle battery can take up too 2 days to charge up fully calcium types can take longer .