New battery - E85M

[mark seeker]

I foolishly let my battery go completely flat and whilst the cTek brought it back to life I'm thinking I should probably change it (its at least 9 years old so only a matter of time I guess before it gives up the ghost). Since it went flat i've had periods where the Christmas lights were on early.

Is the OEM size 278mm X 175mm X 190mm? I'm a little lost on what to replace it with, some mention AGM, is this required?

Last ask (apologies), from reading other forum posts it doesn't need a reset and I won't lose the radio code, has anyone found this not to be the case?

Would this be suitable? https://www.tayna.co.uk/car-batteries/varta/e44/

Thanks in advance



(I'm planning to follow this to replace - https://www.pelicanparts.com/techar...on_Notes_and_Replacement.htm#project-comments)

 

[RMB]

someone recently put a compact lightweight lithium battery in there M.
Might be well worth the upgrade?

 

[RMB]

Here you go, not an M but… page 6…

M

Thread 'Matt’s Road & Track Coupe - Jun-25 update: bushes, brakes, air intake, oil cooler, lithium battery'

Dec 27, 2023

First post to be updated with current spec:

'07 Z4 Coupe 3.0si SE
Stratus Grey
87k miles at purchase (now 93k)

Modifications

Drivetrain:
Engine -
BDS Air Intake
M2 oil filter housing
Front mounted oil cooler
Gearbox -
Powerflex gearbox mounts
Powerflex rear shifter bush
Diff -
Quaife ATB LSD
3.64 final drive
Powerflex diff bushes
New driveshafts

Chassis:
KW V2 coilovers w/ 8kg linear front, progressive 11.5kg max rear
Stud and nut conversion
Braided brake hoses
Brass caliper bushes
Motul RBF 660 brake fluid

Front
IF stage 2 camber plates
Hotchkis 30mm hollow anti-roll bar w/ poly...

• Matt Scarbro
• Replies: 121
• Forum: E85 / E86 Z4 discussion

 

[R60BBA]

Get a CSL/Cooper S battery.

~£75 from main dealer.

P/n: 61218377139.

 

[Nick W]

Got this For the M in February from ML performance. I just copied what was in there, works a treat and a good price.

Order summary​

​ Bosch AGM 096 Car Battery - 3 Year Guarantee S5A08 × 1 SKU: 444778008 £131.95​ Discount MLP10 [td] -£13.20​ Subtotal ​ [td] £118.75​

Shipping

Taxes

​

[td]

£7.99​

[/td]​

[td]

£21.12​

[/td]​

Total

[td]

£126.74 GBP​

[/td]​

You saved £13.20​

[/td]

[/td]

 

[Mr Tidy]

I bought an Exide 096 AGM 70Ah battery from Tayna for my MC in April 2021 for £105 and it is still performing perfectly.

 

[mark seeker]

many thanks all, the lightweight option is definitely something worth thinking over....

 

[Mr Tidy]

I liked the idea of a lithium battery to free up loads of boot space, but after some discussion with other Z4 owners it seems that although the lithium batteries have plenty of cranking power they don't retain charge too long.

So for a car that may not be used for 2 weeks or so sometimes (like mine) they might not be the right option. I bought an AGM one because I read somewhere it would work well for infrequent use, and it has so far!