Ems gone haywire

[Tangotonyb]

Because this post could be confusing I'll key as follows:
Existing battery - the one in the car.
Shed Battery - the one i've had 6 years unused.
New Battery - one I haven't bought yet!

OK - Found the spec on the shed battery - actually carparts4less list it as suitable for my reg. Spec-wise -it's 70Ah with 640CCA

Now my existing battery is AGM - I read somewhere that this is better for STOP/START technology?? It's also rated at 760CCA

So question - does replacing an AGM battery with a non-AGM matter? I could disable the Stop/Start if that could cause issues while I either try to rejuvenate the existing battery or buy a new one. Or if it just works, but is perhaps not likely to last as long, then I'll just swap in the shed battery.

 

[telectrix]

does it work?? if it ain't broke, don't fix it.

 

[Jim_e_Jib]

OK - I didn't know that - just googling around found "It's a common misconception among drivers that if their battery is flat (by which I mean dead), a good long drive will charge it up "

Yup - I thought that!

Going to see if the "new" battery I have which is showing 12V can temporarily replace my car battery - I'll run that through a charger if I can get hold of one - probably need to buy one and see if it can be rejuventated.

Looking at the MXS 5.0 - any thoughts?

If you're looking for a charger, I have this one and can definitely recommend!:

Ring RSC612 12A Smart Battery Charger, 12V Vehicles to 5.0L, All Battery Types, Stop/Start, 7 Stage Charge Cycle, Repair Functions, 4 Diagnostic Tests: Amazon.co.uk: Car & Motorbike

Buy Ring RSC612 12A Smart Battery Charger, 12V Vehicles to 5.0L, All Battery Types, Stop/Start, 7 Stage Charge Cycle, Repair Functions, 4 Diagnostic Tests at Amazon UK. Free delivery on eligible orders.

www.amazon.co.uk

 

[Tangotonyb]

does it work?? if it ain't broke, don't fix it.

Well there are various degrees of "working" are there not?

I mean the existing battery "works" now,although I'm guessing it cannot hold anything like a full charge.

But I'm slightly concerned that if I use the shed battery without modifying any car settings, that I could damage something. My understanding, which may be wrong is that AGM's have different charging currents to standard batteries?

Or is it more of an issue going the other way, i.e. swapping an ordinary battery in a car for an AGM one?

 

[Deleted member 26818]

A couple of my Harleys have AGM batteries, though one of them didn’t start off with one.
The one I’m building has a Li-on battery.

 

[Strima]

A couple of my Harleys have AGM batteries, though one of them didn’t start off with one.
The one I’m building has a Li-on battery.

I put a Li-Ion on my Triumph chop last year an it's served me well. Although I did have to upgrade the charging system to a more stable three phase as the single phase system would probably have killed it and melted the Zener diode...

Back on topic, AGM are good for trips where battery demand is high such as short trips or lots of stop/start in towns as they can handle deep discharge better than flooded batteries and can recharge much quicker.

A modern car charging system should be able to handle the swap with no problems, possibly the ECU may need to be told but I'm not 100% sure as I've never really gone this deep into car charging systems. As long as you have something more advanced than a dynamo you should be OK.

A good battery with no load should be 12.5 volts, after start up should be charging at around 14.5 volts but once the battery has regained its charge this may drop to 13.5 volts. These are not hard and fast figures but a ball park.

Here's a decent chart to refer to:

 

[Tangotonyb]

Lol - according to that chart, my battery was in negative figures

I've run it through a full charging/reconditioning program and no errors so looks like I may not need a new one. Fingers crossed - going back in the car!

 

[Deleted member 72666]

A jump won't fix a flat battery, it will need charging properly.

No it wont but you'll both feel better afterwards!

 

[Tangotonyb]

Well after a couple of hours driving with wipers and headlights etc, remeasured the battery voltage and it's 12.7, so think it may be ok.

I do however have a new fault showing - Auto Start/Stop Error. That wasn't displayed before, the Start/Stop just hasn't worked for a couple of months.

Probably need to get hold a scanner to find out what's going on.

 

[PEG]

I would be tempted to get some codes cleared,and read. The stop/start systems,require a specific grade of battery. A wrong,inferior or faulty battery,can give rise to problems.
For instance,a battery can give an adequate voltage,at rest,but during load,say starting,can dip below certain thresholds,set by the ECU. These voltage drops,are not always the same,at different points,in the system.