Heat

Similar to this: https://www.amazon.co.uk/PORTABLE-STARTER-COMPRESSOR-BATTERY-BOOSTER/dp/B00IDCMLFE/ref=pd_day0_263_3?_encoding=UTF8&psc=1&refRID=SKEG79GQVKRR7TJ0Z7Y1

At this price, I would be checking what battery this uses. If it's a cheapo one that doesn't hold the capacity that it says it does, it won't be very good at jump starting, especially cars with bigger engines.

these boosters never last long or the ones i have had in the past did not, if left without charging for too long a period you can say goodbye to them.

Exactly the same as the one I got from Eurocarparts 8 months ago. Served me well but you must remember to charge after every use and I put mine on overnight every 2 months so they require some maintenance.

for under £15....you can't grumble!

If you treat them right they are great. You need to do what #5 says. Charge it regularly whether its been used or not and it will last you for a long time. I have had mine for over a year and its still in perfect order.

I paid £30 for mine from b&m, Looks identical, Does what it says. They also have a tyre inflator built in which is also great for he kids bike tyres etc.