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[TheBoy]

Quickie question...

Can I use a non AGM battery in a car that was factory supplied with an AGM one?

[Raeturbo]

Can I replace a lead acid battery with an AGM battery?
Yes for the most part an AGM is a drop in replacement for your standard Lead Acid Battery. The charging voltages are almost identical. You are correct that they have a lower internal resistance and can be charged at a much faster rate.12 Jan 2015

[Raeturbo]

Yes for the most part an AGM is a drop in replacement for your standard Lead Acid Battery. The charging voltages are almost identical. You are correct that they have a lower internal resistance and can be charged at a much faster rate. This shouldn't cause a problem on the majority of vehicles as the wiring in the car is designed to handle the maximum rated output of the alternator.

[TheBoy]

Wrong way round Rae, can I drop in a non AGM batt into a car designed to tale an AGM?

[STEMO]

Wrong way round Rae, can I drop in a non AGM batt into a car designed to tale an AGM?

https://youtu.be/zGKk2SzYIig

[Raeturbo]

👍

[Andy H]

Stop-start gives the battery a work out - potentially causing a reduction in battery life

I thought that AGM batteries were developed in an attempt to try to make the battery last a bit longer.

My guess is that you won't notice any difference if you can manage to avoid using the stop-start. What we need is someone to drop a standard battery in and report back on longevity - can you think of anyone curious enough to try ? 

[johnnydog]

https://www.yuasa.co.uk/info/technical/start-stop-vehicle-battery-replacement-warning/

My AGM battery on my Audi failed under warranty, and was replaced by Audi, but the replacement AGM had to be programmed to the car. Certain electrical components won't function correctly without the programming. I understand that AGM and EFB batteries should be replaced with like for like. No doubt owners have gone against this recommendation, but that is the advice. The link above gives some insight into the reasoning behind it.

[Kevin Wood]

You might find it does some "mild hybrid" deeper cycling of the battery than is normal for a wet cell battery. That might involve charging it more aggressively than would be normal for a wet battery. Only one way to find out, though. The world isn't going to end, at any rate.

[TheBoy]

Stop-start gives the battery a work out - potentially causing a reduction in battery life

That piece of shit will be disabled whatever

[TheBoy]

You might find it does some "mild hybrid" deeper cycling of the battery than is normal for a wet cell battery. That might involve charging it more aggressively than would be normal for a wet battery. Only one way to find out, though. The world isn't going to end, at any rate.

Her battery sounds like its struggling, and I have a reasonable battery from my XJ in the garage, so its a no cost option to do something until batteries become more sensibly priced...   ...or I have to bite the bullet and splash down the wrong side of £150 for an AGM one

[Migv6 le Frog Fan]

well,if you buy one of these modern contraptions........

[Kevin Wood]

Stop-start gives the battery a work out - potentially causing a reduction in battery life

That piece of shit will be disabled whatever

It's particularly dumb on the XE. Always stops the engine just as I'm about to pull away.

Do you know if it can be permanently disabled? I'd be up for that.

You might find it does some "mild hybrid" deeper cycling of the battery than is normal for a wet cell battery. That might involve charging it more aggressively than would be normal for a wet battery. Only one way to find out, though. The world isn't going to end, at any rate.

Her battery sounds like its struggling, and I have a reasonable battery from my XJ in the garage, so its a no cost option to do something until batteries become more sensibly priced...   ...or I have to bite the bullet and splash down the wrong side of £150 for an AGM one

I can't imagine it'll do any harm, as long as it doesn't vent in the spare wheel well, of course.

The one thing you don't want in an XE is an unreliable battery, as it does a bloody good job of immobilising itself when it goes flat.

[Sir Tigger KC]

If stop/start cars with AGM batteries have beefier alternators, is there not a danger that a normal battery would get 'over cooked' by the alternator and go bang?   

[Andy H]

If stop/start cars with AGM batteries have beefier alternators, is there not a danger that a normal battery would get 'over cooked' by the alternator and go bang?   

the chemistry is still the same so the target voltage should be the same (14.7v?)

The impedance in the battery will probably limit the maximum current rather than the alternator.