The best battery replacement for a Cerb nowadays is...

[HarryW]

Gazzab said:

Had to buy a battery in a hurry. It has sat for months and so is ‘terminal’. Bought the same again ie:
Type 078 Varta Silver Dynamic Car Battery 12V 63Ah (Short Code: D39) (Varta DI

Total: £74.50
Seller: tayna-batteries(259,456)

Ordered yesterday via eBay. Arrived this am.

I use them too, think of them as a consumable every 3 years or so.

[NuddyRap]

900T-R said:

Painful experience has taught me that there is pretty much a linear relationship between the quality/reliability of LiFePo4 cells and the price of the end product.
The actual disposable capacity of lithium, AGM, and conventional 'wet' lead-acid batteries in relation to their Ah rating is completely different. As a rule of thumb, with AGM batteries I'd go for half the Ah rating of the standard battery it replaces, and halve the rating again for a lithium battery.

It's correct that you can't get away with leaving the lights on for very long with the smaller capacity batteries, but only a fool would run an expensive lithium battery without an automatic cut off that shuts the power off when it drops below ~12.6V (i.e. more than enough to start the car), anyway. Once it drains to below 10V, it's 100% certain rendered a very expensive paperweight.

Having said that, the battery is the easiest place to look if you want to lose some serious weight from your car.

This is what I was getting at in wondering why it would be brave, as you can't judge capacity in the same way, and a cut off gets around parasitic drains.

I don't quite get your paperweight comment though, as with the appropriate charger lithium batteries recover from even repeated deep discharge very well.

What was your painful experience?

[Jhonno]

NuddyRap said:

This is what I was getting at in wondering why it would be brave, as you can't judge capacity in the same way, and a cut off gets around parasitic drains.

I'm aware the ratings are different as the lithium batteries have more usable capacity, however, I'm running a lithium and I personally wouldn't go for a 20Ah, unless you are going to activate the kill switch any time you leave it sat. Depending on the battery you can't jump some of them either.

[c6erb]

any that bloody fits ;-) LOL

[900T-R]

Jhonno said:

unless you are going to activate the kill switch any time you leave it sat.

I do this as a matter of course on any TVR. Given what has happened in two of the largest/most well known TVR workshops in the past decade or so, I live by a strict policy that any car left overnight at Glym9 garage - which contains five TVRs in various stages of fettling/restomodding - will not have a 'live' battery. Remote on/off switching (sadly on just one car so far) makes life so much easier

[pmessling]

I've been making these battery bases and clamps for a while now so should the battery be bigger or smaller the clamp can be made different to accommodate. All stainless so get away from the rusty item

[Skellz]

i have had an antigravity lithium battery in my cerb for about 2 years now. Weighs 15kg lighter than my previous battery. It has an automatic disconnect when the battery power falls below a certian amount, and thereby protects the battery.

The terminals are the other way round, but as the battery is smaller, you can work the cables ok.

[NuddyRap]

Skellz said:

i have had an antigravity lithium battery in my cerb for about 2 years now. Weighs 15kg lighter than my previous battery. It has an automatic disconnect when the battery power falls below a certian amount, and thereby protects the battery.

The terminals are the other way round, but as the battery is smaller, you can work the cables ok.

Which one did you buy? Do you have a link or spec that you can share?

[FarmyardPants]

NuddyRap said:

Skellz said:

i have had an antigravity lithium battery in my cerb for about 2 years now. Weighs 15kg lighter than my previous battery. It has an automatic disconnect when the battery power falls below a certian amount, and thereby protects the battery.

The terminals are the other way round, but as the battery is smaller, you can work the cables ok.

Which one did you buy? Do you have a link or spec that you can share?

Also considering one of these. @Skellz, how are you getting on with it, any issues or non-starts? Had to use the restart feature yet?

The 40AH with CTEK charger and bluetooth monitor comes in at 1k inc vat and delivery: https://www.antigravitybatteries-uk.co.uk/extreme-...

Might be able to get the charger or monitor for free with a phone call, who knows.

It's not cheap but I'm saving 4x that pa on season tickets . Plus my cerb spends 99% of its life in my garage on the charger so the reduction in AH shouldn't be too much of an issue and it should at least last..

[Jhonno]

FarmyardPants said:

NuddyRap said:

Skellz said:

i have had an antigravity lithium battery in my cerb for about 2 years now. Weighs 15kg lighter than my previous battery. It has an automatic disconnect when the battery power falls below a certian amount, and thereby protects the battery.

The terminals are the other way round, but as the battery is smaller, you can work the cables ok.

Which one did you buy? Do you have a link or spec that you can share?

Also considering one of these. @Skellz, how are you getting on with it, any issues or non-starts? Had to use the restart feature yet?

The 40AH with CTEK charger and bluetooth monitor comes in at 1k inc vat and delivery: https://www.antigravitybatteries-uk.co.uk/extreme-...

Might be able to get the charger or monitor for free with a phone call, who knows.

It's not cheap but I'm saving 4x that pa on season tickets . Plus my cerb spends 99% of its life in my garage on the charger so the reduction in AH shouldn't be too much of an issue and it should at least last..

The equivalent Deadweight with charger is ~£430 and would work exactly the same for your use. Give them a shout.

[camel_landy]

Following with interest as my Red Top needs replacing.

M

[Jhonno]

camel_landy said:

Following with interest as my Red Top needs replacing.

M

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

[FarmyardPants]

Jhonno said:

camel_landy said:

Following with interest as my Red Top needs replacing.

M

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

Thanks Jhonno, will have a look. How long have you had it and any concerns at all? Thanks again

[ukkid35]

Jhonno said:

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

If only I could lose 17kg just by paying £400

[gruffalo]

ukkid35 said:

If only I could lose 17kg just by paying £400

me too, no effort instant weight loss would be nice.

[Jhonno]

FarmyardPants said:

Jhonno said:

camel_landy said:

Following with interest as my Red Top needs replacing.

M

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

Thanks Jhonno, will have a look. How long have you had it and any concerns at all? Thanks again

Had mine about a year now and no concerns at all.

[Jhonno]

ukkid35 said:

Jhonno said:

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

If only I could lose 17kg just by paying £400

Plus the added bonus of a better all round performance, it would be £400 well invested!

[FarmyardPants]

Jhonno said:

FarmyardPants said:

Jhonno said:

camel_landy said:

Following with interest as my Red Top needs replacing.

M

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

Thanks Jhonno, will have a look. How long have you had it and any concerns at all? Thanks again

Had mine about a year now and no concerns at all.

Thanks. Do you keep it on a trickle charger/conditioner? If so, which one? The deadweight faq recommends against that.

[Jhonno]

FarmyardPants said:

Jhonno said:

FarmyardPants said:

Jhonno said:

camel_landy said:

Following with interest as my Red Top needs replacing.

M

Running a Deadweight Touge 500 in mine. High compression 4.5, and it monsters it over on the starter. Plenty of juice too.

Thanks Jhonno, will have a look. How long have you had it and any concerns at all? Thanks again

Had mine about a year now and no concerns at all.

Thanks. Do you keep it on a trickle charger/conditioner? If so, which one? The deadweight faq recommends against that.

I disconnect mine. They like to sit at about 80%. It lasts a while if sat connected so during useage months I just make sure I run it out every couple of weeks. They don't mind going flat iirc, but they go into shutdown so need waking up. Charger is more turn it on every few weeks for a day to keep some charge in it, rather than constant charge. They aren't like a lead acid battery and degrade if left off charge.

[FarmyardPants]

Understood. I don’t really want to disconnect if I can avoid it (hassle, lose clock etc). It regularly gets left a few weeks between drives, even in the summer. I might get a timer socket thing and give it 10 minutes a week, or whatever it needs to keep it around the 80% mark. That Bluetooth monitor from antigravity would be useful to get to know the battery and keep it in good nick.