Car Jump Starter, 500A Peak 12V Output Car Battery Booster Pack, 20000mAh Portable Lithium Jump Starter, Power Bank External Car Battery Charger with Clamp, 3 Flashlight, Charging Cable, Power Display

After a full charge and showing 100%, used for first time on a vehicle with dead battery - couldn't get it started, just enough power to set alarm blaring. Only 2.0 petrol engine....not impressed.

Our C3 diesel battery was low on charge to the point it wouldn't kick over first thing in the morning and my charger proved to be faulty.. Bought this as a stop gap and so pleased I did. Connected it up as per instructions and engine started instantly. It now resides in the glove compartment and provides reassurance with the bonus of providing highly portable emergency supply for the mobile phones. Hope the device lasts as it's not exactly cheap.

This thing is absolutely useless and wouldn't crank over a little 1.3l engine. It's also extremely light, lighter than your phone in fact. So I suspect the battery capacity is actually a fraction of the stated 20,000mah, probably less than 10. I think I will disassemble it and see about adding some extra 18650 batteries I have spare. I may update upon disassembly.Update:As suspected, this thing is a fake. I disassembled it, carefully unwrapped the the battery and surprise surprise, it's a fraction of the capacity stated. It contains 3 cells, all with a capacity of 1500mah, so a grand total of 4500mah, less than your average smartphone. It's barely enough to tickle your average car battery with 60, 70ah so how other reviewers are stating they've had success with this thing is a mystery.

Simple, light, easy to use, and efficient. However, it is not yet known how long the battery's life will last especially during wintertime

Purchased in the summer, tried for the first time today on a 1.1L car, didn't work dispite being 100% charged.

The media could not be loaded.  Yes would not recommend this product wouldn't even start my car totally dead now now pressing the side button and it should be light up to say 100% but nothing coming from it

Useful for the car, phone laptop, e-cig. Small and compact.

Even after a full charge it won't even crank my mini one engine. The battery was flat. For phones, standard charging.(Don't expect fast charging) Spend the extra £30 and buy the right device.