Lightweight battery

[jamesbxxx]

Just fitted an interesting option for those in the UK. The price was just too good for me not to give it a try!

Predator SureStart, 40Ah, 1200 CCA, 6.9kg... 200 quid

After a bit of research, and some direct questions on suitability to the helpful mob at JustBatteries.co.uk, I sourced mine via their eBay storefront (they were running a promotion there for 10% off at the time).

I originally tried to fit the 56Ah variant, but the casing was ever so slightly too long to fit, so I returned that and grabbed the 40, which is slightly smaller than the stock battery.

Fits easily (obviously), fired eagerly on first startup, voltage is a solid 13.28 at rest (I have a remote monitor hooked up).

View attachment 68381View attachment 68382View attachment 68383

EDIT: added data sheet to save people rummaging around for it

Just purchased from same supplier via eBay for £125! Fitted with no issues today. I can confirm that it’s the same depth, so fits the clamps fine, and it a little less wide. However, the “bump panel” is still required.

 

[lowtus]

will lithium batteries allow the car to sit longer between drives?

 

[crestima]

will lithium batteries allow the car to sit longer between drives?

Yes, and If you google search your question literally, you'll get a complete explanation as to why.

 

[bmwzimmer]

V6, you guys are all good. I4's were problematic but we might even be in the clear. I posted recently how I noticed my maintainer went green (fully charged) in record time (like an hour maybe?). I also noticed that it started doing this right after one of my recent software updates.

My theory is someone at Lotus caught on to the whacky AMG M139 charging cycle when they were testing the lithium Ion battery for the 420 and it crapped out with the old charging cycle. Then that same engineer said "fuggit", just update it on the next software round for all i4 cars. Again, just a theory.

If anyone has a battery monitoring sensor (Like AntGravity's) on their i4, you'll be able to confirm this pretty quickly as you'll see charging the second it gets to 90 or so % vs the previous 70-75%.

70-75% charging on an LFP battery and occasional top off to 90-100% via trickle charger is a really healthy way to treat a LFP battery. I don’t see why not get a 40Ah LFP for the Emira if you don’t mind trickle charging regularly which many of us do today regardless with the AGM battery

 

[scv]

CLOSED 1 OCTOBER 2026

Predator Batteries has​

After three years powering motorhomes, boats and off-grid systems across the UK, Predator Batteries has closed. Thank you to everyone who bought from us. For everything you’d have bought here, we recommend Alpha Batteries.

Shop at Alpha Batteries