deep discharged cranking batts

Joined: 30 Jun 2004 Location: Brisbane sometimes

Hi guys

i managed to accidentally flatten the dual cranking batteries in the cruiser. They are brand new N70 wet cell batteries, that were discharged to about 9 volts. They wouldnt crank the 1HZ over and struggle even with dash lights. Are they now likely to be farked/lifespan shortened as a result? any way to test or quantify it? any way to rehabilitate them?

I've tried searching by the way but outers search is a bit clunky

cheers.

MILO

Joined: 30 Dec 2002 Location: Adelaide

I think the main thing is to limit the time period they are left sitting discharged, that's when the damage occurs.

Joined: 11 Dec 2004 Location: Queensland

Hi rockcrawler31, as murcod posted, get them on a charge as quickly as possible and until you charge them, you won’t know how they are.

You don’t need a big current charger just get them charging and if they are not damaged, they will fully charge and you will probably have no problems.

Taking batteries down to 9 volts is never recommended but it’s not uncommon for people to leave headlights on and take batteries down much lower and they have still been able to bring them back to life.

Joined: 04 Apr 2008 Location: West Victoria

Get ya self a C-tek charger, they have a recondition setting that I have used to bring back two batteries my mechanic said where dead.

They are expensive but are the best around.

Joined: 30 Jun 2004 Location: Brisbane sometimes

thanks for the replies guys

Joined: 11 Jan 2006 Location: Seville Vic

Corgie Carrier wrote:

Get ya self a C-tek charger, they have a recondition setting that I have used to bring back two batteries my mechanic said where dead.

They are expensive but are the best around.

Couldn't agree more.
I have a C-tek and the recondition function is a lifesaver. I have reclaimed at least 9 batteries that were headed for the recyclers.

As stated above, get them on a charger ASAP. It doesen't really matter what charger, just as long as they are charging.

Joined: 25 Jul 2004 Location: Central Coast, NSW

MICK77 wrote:

Corgie Carrier wrote:

Get ya self a C-tek charger, they have a recondition setting that I have used to bring back two batteries my mechanic said where dead.

They are expensive but are the best around.

Couldn't agree more.
I have a C-tek and the recondition function is a lifesaver. I have reclaimed at least 9 batteries that were headed for the recyclers.

As stated above, get them on a charger ASAP. It doesen't really matter what charger, just as long as they are charging.

did a quick search on these chargers, any hints on where to get one cheaper ?

Joined: 04 Apr 2008 Location: West Victoria

fleebay

Joined: 25 Jul 2004 Location: Central Coast, NSW

Corgie Carrier wrote:

fleebay

yeah only found the smaller ones on there though

Joined: 04 Apr 2008 Location: West Victoria

Keep lookin! I got my 7amp one off there.

Joined: 25 Jul 2004 Location: Central Coast, NSW

Corgie Carrier wrote:

Keep lookin! I got my 7amp one off there.

was kinda looking for something a bit bigger Smile

ill keep looking though

Joined: 04 Apr 2008 Location: West Victoria

How big are your batteries?

The 7 amp will charge a 225a/hr battery in 24 hours.

That is plenty big enough for any 4x4 battery.

Joined: 11 Dec 2004 Location: Queensland

Corgie Carrier wrote:

How big are your batteries?

The 7 amp will charge a 225a/hr battery in 24 hours.

That is plenty big enough for any 4x4 battery.

Hi Ice, unless you have a particular reason for fast charging your battery(s) it’s actually better for the battery to have a slow ( low current ) recharge.

Joined: 30 Jun 2004 Location: Brisbane sometimes

so which of these models is best for a vehicle that has two N70 cranking batteries in parallel? and do you charge both batts at once or should you disconnect the batteries and charge them separately?

Joined: 30 Jun 2004 Location: Brisbane sometimes

Also, would a xs7000 that is suitable for big car batteries also be good for a small motorbike battery?

Joined: 25 Jul 2004 Location: Central Coast, NSW

Ive got a truck so it has fairly large batteries in it

waiting 30hrs just isnt an option if it goes flat for some reason Eg leaving the 12v converter on

Joined: 04 Apr 2008 Location: West Victoria

The xs7000 is recommended for batteries from 20ah to 225ah.

Charging in parallel should be ok, what is the total amp/hr? If above 225 you may need to go to the xs25000.

As far as a dead flat battery goes, the table on the box (xs7000) says that it can charge a dead flat battery, ready to drive, in 10 minutes.