What do you know about batteries?

[Josho]

So I'm fed up with crap jump packs.

Snap-On's old jump packs were pretty good and two together seemed pretty unstoppable.

https://www.ebay.co.uk/p/Replacement-Battery-for-P...

This is a similar battery.

However, I'm just curious as to what makes those batteries good as a jump pack. I can buy one with 36ah but that doesn't make cranking power any better does it?

I can buy a big van battery for £160 that I know will start anything however they are very heavy.

I have an old jump pack with the above battery and I'm thinking of getting two of these batteries or similar and just wiring in the charge port and indicator etc.

However how can I tell what battery is best for cranking power rather than just capacity?

I've got about 20 2ah batteries that are sealed lead acid but I have no idea if they are good or not.

Cheers guys!

[skyrover]

Buy this

https://www.amazon.co.uk/NOCO-GB150-UltraSafe-Lith...

Job Jobbed

[Josho]

I have one but it wont start a Nissan Cabstar from flat for example.

[GreenV8S]

skyrover said:

Buy this

https://www.amazon.co.uk/NOCO-GB150-UltraSafe-Lith...

Job Jobbed

It claims an impressive-sounding 22,500 Joules and 4000A capacity, but if you assume a nominal 12V that works out to a mere 0.5 Amp-Hours. That's about 1% of the capacity of a typical lead acid car battery. That seems consistent with the tiny physical size.

[darreni]

Buy a sealed RS1, I’ve had mine about 10 years and it’s never let me down.
Weighs a ton.

[julianm]

If you an find a new old stock DETA 'dry' battery, have it filled & charged properly it will last around 10 years with normal use. Some are on sale on Ebay including a couple of whoppers with over 700ah rating - £100 for the pair.
https://www.ebay.co.uk/itm/TWO-DETA-622-BATTERYS/1...f:0
other smaller ones at £25 each which is a real bargain.

[Mikey G]

Josho said:

So I'm fed up with crap jump packs.

Snap-On's old jump packs were pretty good and two together seemed pretty unstoppable.

https://www.ebay.co.uk/p/Replacement-Battery-for-P...

This is a similar battery.

I bought a similar 22ah battery for my old jump pack about 6 years ago, wasnt a Lucas but was green and think it was for a golf cart. managed to start a 2.4 transit diesel from cold and pretty much flat no issues whatsoever even if it does say standby/cyclic use it still works very well to this day.

[skyrover]

GreenV8S said:

skyrover said:

Buy this

https://www.amazon.co.uk/NOCO-GB150-UltraSafe-Lith...

Job Jobbed

It claims an impressive-sounding 22,500 Joules and 4000A capacity, but if you assume a nominal 12V that works out to a mere 0.5 Amp-Hours. That's about 1% of the capacity of a typical lead acid car battery. That seems consistent with the tiny physical size.

Sold a few to the local mechanics... they seem happy with them, along with the usefulness as portable battery for devices etc when camping.

[normalbloke]

I built one, with surplus bits in my workshop. Optima battery, CTEK quick connect lead,Bluetooth battery monitor, isolator,70sq mm leads all mounted to an old(modified) bottle trolley. Starts most things.

[rambo19]

Need more info for where/when you want to use jump pack.

Home use only?
Something portable and kept in car all the time?