Lithium Jump Starters

Quote:

---

Originally Posted by GregMilner

Incredibly versatile gadgets.

---

Aside from having a high energy density, lithium cells also have an extremely low internal resistance so they can supply lots of amps for a short period. They have an extremely low rate of self discharge, and I've only seen two go up in smoke. In both cases they were the switching MOSFETS rather than the cells themselves.

The problem with these units is they don't have any current limiting outside of the inherent resistance in the semis, the cables and battery clips. So if you really do have a duff battery and the stars align you can certainly let the smoke out. Admittedly it's hard to build a reliable current limiter for a couple of hundred amps that'll work more than once.

That said, if I was heading into the middle of nowhere, I'd have 2 of these in the box right next to the water bottle and EPIRB.

Quote:

---

Originally Posted by DiscoMick

Here's a picture of my Projecta lithium starter. I put the roll of tape there for a size comparison. They come in several sizes.
https://uploads.tapatalk-cdn.com/201...459b555807.jpg

---

The projecta seems to be the answer. Beware as the local SCA outlet did not seem to know a lot about it so now I am off to Repco. Thanks again for all the help.

They come in several sizes so make sure you get one that is big enough.

Quote:

---

Originally Posted by Eevo

ive found these jump starters dont last more than a year or 2

---

I’ve had mine for more than 5 years now and had to use it recently for the first time in three or four years. Started a HiLux diesel that was struggling to turn over without a problem.

Quote:

---

Originally Posted by DiscoMick

They come in several sizes so make sure you get one that is big enough.

---

So what would the recommended size be to start a 2Litre petrol? They seem to vary from 800 to 1200 from what I can see. A good size but not an overkill?

Guess who had a flattie yesterday but was close enough to a power Point & my 240v charger so no real drama? This time.[bigsad].

Quote:

---

Originally Posted by 4bee

So what would the recommended size be to start a 2Litre petrol? They seem to vary from 800 to 1200 from what I can see. A good size but not an overkill?

Guess who had a flattie yesterday but was close enough to a power Point & my 240v charger so no real drama? This time.[bigsad].

---

depends on petrol what.....

IVe had one not want to start a series III 2.25p but would wind over a newer td5 happily.

these things deliver the amps they advertise for just a few seconds and they shut down on low voltage.. its the delivery curve that makes them work they stay on a high voltage for a relatively long time and then drop off quick.. as opposed to a traditional lead acid type battery which has a comparatively linear drop off rate.

Thanks Dave. So the answer is..... The biggest you can afford, roight?

Reading on from my initial post they do seem to be the Dog's Danglies & work more often than not.[smilebigeye]

Quote:

---

Originally Posted by 4bee

So what would the recommended size be to start a 2Litre petrol? They seem to vary from 800 to 1200 from what I can see. A good size but not an overkill?

Guess who had a flattie yesterday but was close enough to a power Point & my 240v charger so no real drama? This time.[bigsad].

---

You saw the pic of mine a few posts above. That works for our Puma diesel and smaller petrol cars. Above that, I haven't tried.
This is a larger size:
PROJECTA LITHIUM JUMPSTART BATTERY PACK 1200A 12 VOLT FOR DIESEL PETROL IS1200E

I have a SJS branded one. Have used it many times over the last 4 yrs.
Its size is 600A and claims to start 4.5L petrol and a 3.5L diesel.
I have started my 4BD1 county with a very flat battery and used it at least weekly for a year to start my dead flat tractor until i got a new battery for it.
I'm sure the newer one would be even smaller and better now.

Do these jumpstart units get replenished with a 240 volt charge?