Jumping Jack Max Portable USB Charger

I am writing this as I cannot find a way of sending the charger back as it has a 2 year guarantee but has just stopped after 6 months despite only being used 3 times. Tried the usual returns policy bit through amazon but on the invoice their doesn't appear to be any way of sending it back under warranty. For the couple of times used it was very good but has just 'died' and will not recharge. I am hoping someone will pick this review up and inform me of how to sort this out, mike

Its the bees knees. Only required this once to start a vehicle but found it excellent as backup power for mobile phones & ipad. It has been moved from the boot to the front seat and knapsack - would not be without it whenever I travel. Brilliant.

Maybe my bad luck but I've had to return two of these. One didn't charge although it had 4 full bars when plugged into the mains but was dead when unplugged, and the other didn't hold enough charge to get one iPhone 6 back up to full power.

Got started by a friend with a jumping jack so I brought my own ,very impressed

Amazing product! It works!

Bought one after my Mondeo battery ran dry, my friend came out with one of these, I hadn't seen one before and assumed it was a clever adapter, when it started the 2.0l diesel engine from flat I was gobsmacked. Ordered one immediately what an amazing tool

Geat tool really handy to have.....