Battery specifications

Hi there,

I am looking to replace my battery as we approach the cooler months and wanted to understand the code on the battery better.

In my case it’s AH52-10655-AA. As I understand it the first two numbers are the capacity (52Ah) and the remaining digits are size and date of manufacture. However also on the battery it states 80Ah so why are there two capacities given? Is the smaller one under cranking load and the bigger one for a C20 discharge rate or similar?

Also, would a suitable AGM battery from different manufacturers all have a similar low internal resistance, which tends to be required for the stop/start feature?

Thanks

I'd not be overly concerned about the manufacturer's OEM identification system, it's the capacity that's important, but if it's nearing 10 years old any capacity specifications will now be wrong anyway. That battery is an 80AH battery with a CCA of 800 Amps, so a battery that meets that specification is what is needed.

Get the biggest battery that fits in the tray, and for stop start make sure it's an AGM battery.
The Freelander 2 is a power hog, so needs a battery which is capable of delivering the the energy needed to cover the power requirements of the vehicle.
The largest size that fits in the tray is a 110 (standard numbering system), so a 110 AGM is what to look for.
Choose a premium brand of you want a long life.
I use these people to supply batteries for my vehicles.

What reg is your FL2 does it have the extra earth lead ? i am wondering if the later type need the extra earth lead on a stop start engine, i am also sure the stop start can be turned off.

Start stop can be disabled in some cars when you change the battery type from agm to vrla/maintenance free. I don't know if you can on the fl2 but i would think there would be an option when you do the battery reset in diagnostics.
AGM is more expensive but because they are better suited to start/stop engines, they are also better for short journeys and power hungry cars regardless of start stop tech. They are more forgiving to deep cycling and can be charged up quicker but are more sensitive to over charging

kermit_rr said:

Start stop can be disabled in some cars when you change the battery type from agm to vrla/maintenance free. I don't know if you can on the fl2 but i would think there would be an option when you do the battery reset in diagnostics.
AGM is more expensive but because they are better suited to start/stop engines, they are also better for short journeys and power hungry cars regardless of start stop tech. They are more forgiving to deep cycling and can be charged up quicker but are more sensitive to over charging

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Thanks for all the replies. Yes the stop-start can be turned off (it’s an ‘Eco’ switch).

I have replaced it with one from Halfords which is 80Ah AGM (see pic) but am still curious why my original (see other pic of battery with white label) makes reference to two capacities, even if due to age they are no longer accurate.

Like the old battery, that says 80Ah but 52Ah in the long number, the new one says it’s 80Ah on its label and then 115Ah on another part of its casing (see third pic). Why the two values?

I meant start stop might be able to be disabled via the diagnostic port. It's an option on some cars.
The 2 numbers are usually AH and CCA cold cranking amps eg 100ah 850cca.
Ah is how long the lights will stay on, cca is how much power it has. To turn an engine over. A small car with a small starter motor doesn't need an much power as a big engine

The two numbers I refer to are Ah and CCA is a different number. See the pics I attached.

I can only see 80ah and 800cca (amps)

Underneath the 800A is a long number starting AH52. That denotes the capacity and the other numbers the size and date of manufacture. On the newer battery, there is 80 and 115AGM.

Ah52-... Is probably just some sort of model/ref number. Nothing to do with AH.
115AGM is probably model related too

115agm - 80ah 800cca

kermit_rr said:

Ah52-... Is probably just some sort of model/ref number. Nothing to do with AH.
115AGM is probably model related too

Click to expand...

115 is the capacity of the Battery. AGM means assimilated glass mat, which means the acid can't spill if the battery falls over, or the case splits.

Turboman said:

115 is the capacity of the Battery. AGM means assimilated glass mat, which means the acid can't spill if the battery falls over, or the case splits.

Click to expand...

115AGM is the Halfords shelf number
Always thought it was absorbed glass mat?

kermit_rr said:

115AGM is the Halfords shelf number
Always thought it was absorbed glass mat?

Click to expand...

Could be absorbed, I do know it is very good, I have 4 of them, 125Ah.
The ones I have are marked 125AGM, although they didn't come from Halfords, so I assumed those were the same.
I don't go to Halfords. Went there last year to ask for a tube of Hylomar, when the chap said he had never heard of it, I gave up on them.

I'll probably replace my l322 battery with agm when it's due, even though the car isn't start stop.
I don't go to halfrauds either. Unless in an emergency then still usually regret it

AGM means Absorbent Glass Mat.

Kerrowman said:

Underneath the 800A is a long number starting AH52. That denotes the capacity and the other numbers the size and date of manufacture. On the newer battery, there is 80 and 115AGM.

Click to expand...

The AH52 is part of the part designation, and nothing to do with the capacity of the battery. The capacity is 80AH, which is rated as a discharge over 20 hours, which in this case would be a 4 Amp discharge for that period down to a voltage of 2 Volts per cell.
The CCA rating is how many Amps can be drawn for a short period, like when starting the engine. A Freelander starter is rated at 2.5kW, which will be over 200 Amps imposed on the battery.
AGM means absorbed glass mat, which is basically a glass fibre layer between the plates which reduces gassing and plate damage from the acid. This allows the battery to provide more high current discharges than a normal Wet lead acid battery.