another battery question

As an example something like this:

I would probably go with a more "mainstream" brand like:

Thanks. I’ve ordered it.

Nige

"12 Volts 1000 Amp Hours"

sniff, sniff ...

If trying to reduce costs there are often second hand compressors on EBay that have come from cars where the manufacturer doesn't supply a spare tyre - only a can of some kind of gunk and the compressor. In my (limited) experience these second hand items are much better quality that some of the new third party tyre are compressors found on Amazon etc.

Completely random example

May be a typo. Definitely capable of 1000A tho. But will only stay up fore about 5 minutes at that rate

No, 1000A instantaneous. BigClive took something like this apart and discovered possibly why they could supply such a high current (for a very short time).

The advert does say 1000Ah of course...

But lithium cells are really good at peak currents.

I would imagine the cells are around 25-50Ah.

On 16/12/2024 12:22, alan_m wrote: BigClive took something like this apart and

Nige Danton snipped-for-privacy@nospam.com wrote in news: snipped-for-privacy@news.eternal-sept ember.org:

Oh s*it, too late to cancel?

No meaningful specs stated, no capacity quoted and datasheet obfuscates this by stating it in joules.

IMNSHO these devices are generally crap and you will lucky to be able to start a full flat car from one (from experience).

You can't store it in the car in Winter as lithium battery performance will be stuffed at low temperatures.

If you abs must buy one of these get it from somewhere that honestly states its capacity and offers 30day returns (more if proved faulty) eg.

or

A friend has one of the supercapacitor starters and starts cars with it most weeks ... they work by sucking the remaining energy from the dead battery into the capacitor over several minutes, then giving it all back in one go to start the car?

Andy Burns snipped-for-privacy@andyburns.uk wrote in news:lsao56Fhtl6U1 @mid.individual.net:

And could potentially work as a portable jump, taking power relatively quickly from a surrogate vehicle or in-home supply and transferring it to the affected vehicle.

Any product details? I'm seeing various from £140 to £600, aliexpress excepted.

At 12V that would be about 0.5kWh, which seems unlikely in such a small package.

If that's 'power bank mAh' (always measured based on a single cell, even if the cells are in series) then 25Ah corresponds to about 100Wh, which is a typical drill battery. It's a similar weight/volume as a drill battery so it's possible to be 70-100Wh...

Ah, 24Wh lithium ion:

Theo

I've asked the Q ...

It was a Sealey, but it's died so scratch that ...

I have one (the GB50 model) and: a) I store it in the car over winter - after all that's when you are most likely to need it. b) It worked a treat to start a very cold 2L diesel car (@ circa 2 C ambient) where the battery was pancaked. I've used it on other occasions when the demands placed on it were less extreme.

Opinions eh?

Andy Burns snipped-for-privacy@andyburns.uk wrote in news:lsavokFipprU2 @mid.individual.net:

Thx all the same. Knowing the nature of the components I would be concerned about their robustness.

Maybe a roust lithium store with a decent capacity is the way to go but they look pricey. As per my earlier post I don't rate the paperback book sized ones.

He's come back with a recommendation for the NOCO GB70

I have a Noco GB70, bought in 2018 from Amazon in a flash sale at a large discount. I had been planning to get a smaller version, but with the discount it made sense to get this one. It has started a Ferrari FF (6.3l V12 650hp) with completely dead battery (after a few tries) and several diesel vans. It still works fine. I have also used the 12V output which is regulated. The 12V connector is special, so I bought an extension lead and made a couple of adapters to Powerpole connectors.

John