Re:Lithium jump packs

I don't know and have often wondered myself if they are actually any good or not.
Construction wise they all fall into the "abusing components" category, in that the cables are thin, the batteries within are almost operating in a short condition etc. They also make bold claims, up to 20 starts from a single charge is my favourite. 
Plenty of people give positive reviews, so maybe it's just me being sceptical, it's in my nature.

The reality for me is I simply have a set of old fashion jump leads and a second vehicle I can use to jump start, not that dissimilar to yourself, so do you actually need one?
If it's a definite yes I would also consider a second "winch" battery configuration, that way it's always charged and ready to go, and may not cost much more that a pack.
If you go for one give us a review, I would find it interesting  as I also don't believe Amazon reviews!

You might find this interesting
I like big Clive, he takes things apart just to see how bad or good they are.
 

For what it's worth i like Scimike's post, biggest main battery and a second winch battery, your new jimny with all it's electronics everything will work better on a daily basis, if in trouble jump off second battery

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I looked around Xmas for and was going to buy a Sealey model, but Mobile Solar Chargers got great reviews so waited a week for them to be back in stock and bought the bigger of the two models since it will power 12v equipment, 18v for a laptop and of course USB for phone charging as well as jump starting a car.

They are an interesting company, they direct this power bank at standby power for expeditions, like trekking across the desert or to the North Pole and the jump starter is really an afterthought. I have never had opportunity to try it but have no doubt it would start a Jimny or any other vehicle with ease. I have used the 12v for powering a pump and also a two way radio.

It’s really well made, comes with every lead and zips in to a nice case. I also got a free USB lamp thrown in.

The guy who runs the company is super helpful, so if you want to spend a bit more but get a great British product that will also start you tractor, these are the guys. Have a look at their blog, it’s quite interesting.

www.mobilesolarchargers.co.uk/shop/details/overland-plus

Did I mention it is waterproof, has a torch and will even flash out SOS in morse code, could be ideal for the nautical members (take note Martin).

Robin

I have on of cheaper starters and it works nicely. ( YABER Starthilfe Powerbank, 800A Spitzstrom 12000mAh Tragbare Auto Starthilfe 12V Autobatterie Anlasser mit LED Taschenlampe )

I like it because it is small and light and although I also have a standard battery in the garage as backup I very much prefer the small one.

I plan on buying one, or to be honest, several (one per vehicle), but haven't gotten around to it. Like you I was a sceptic, what swayed me is one of my friends, a mechanic, has one, and he has had good experiences with it.

One of my concerns was how often I would need to charge it - ideally I'd like to be able to treat it as I would jumper cables - toss it in the back until it's needed, without having to worry about it being dead - I was in a co-worker's car and she had one, which she said had been used to start her car the day before, it belonged to a friend and he had only charged it once, several months before, so it does hold the charge for extended periods.

I'll most likely go with the Anker ROAV brand, primarily because I've had very good experiences with their products, I have several of their USB chargers, and also a couple of their dash cams, chinese made, but they make a good product.

wrote:

For what it's worth i like Scimike's post, biggest main battery and a second winch battery, your new jimny with all it's electronics everything will work better on a daily basis, if in trouble jump off second battery

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I have a dual battery setup in my Jimny. While the vehicle is not running, everything runs off the auxiliary battery, leaving your car's battery out of the equation, so that there is never an issue starting the car. There is also an override so that you can jump start the car from the second battery if needed.

Regarding Re-Charging: I had mine sitting in shelf for 4 months and then suddenly had to help a friend. It worked really good. 

Also the pack can be charged in the car with a usual USB charger. In case you would want it to permanently attached to the USB, I would check how much current flows back from the jump starter into the switched-off USB charger. I once had a car USB charger that drained my mobile phone, if I forgot it in the car.