Parents bought one of these a month or so back because their diesel X-Trail has a weird parasitic leach on the electrics and flattens the battery if it's not driven regularly. We've used it on their car a couple of times now, they used it to help someone stuck in a car park and it rescued the Z4 today outside my opticians (my own fault for opening the roof on the key without the engine running!)
If anyone is looking for a battery pack then I'd recommend it. Got it from Amazon for just under £70 https://www.amazon.co.uk/gp/product/B06Y657D1S
If anyone is looking for a battery pack then I'd recommend it. Got it from Amazon for just under £70 https://www.amazon.co.uk/gp/product/B06Y657D1S