On my recommendation my mate bought one of these from Halfords a week ago -
https://www.halfords.com/workshop-tools/garage-equipment/battery-chargers-jump-starters/ring-12a-smart-charger-charge-and-diagnose?_br_psugg_q=ring+battery+chargerHe'd got a £30 gift voucher and we used my trade card.
He tried charging his car with it, and after 18hrs it came up with fault code F03 (faulty charger).
We then tried it on his wifes car, after 6hrs, same thing, fault code F03.
Yesterday we took it back to Halfords, the gofor was behind the counter.
Us - We want to return this battery charger as it's faulty - came up with fault code F03.
Gofor - Did you charge it up first, it won't start your car unless it's been charged up.
Us - Er, it's a battery charger not a jump starter, it can't be charged up.
Gofor - You still have to charge them up.
Us - Is the manager about.
Manager comes ove.
Gofor - They want to return this, but they didn't charge it up first.
Us - It's a battery charger.
Manager opens box, takes out instructions and reads them from cover to cover.
Manager - No, it doesn't need to be charged up, what's a matter with it?
Us - Repeat we tried it on two cars, came up with fault code = faulty charger.
Manager - What do you want to do?
Us - Exchange it for another one.
Manager wanders off to the shelves, comes back and says none on the shelf, will look in the store.
After a while, the Gofor starts talking into his comms. device.
Gofor - What exactly was the fault again.
Us - We explain.
Gofor communicates this through his comms. device.
Gofor - What did you do to get the fault code up.
Us - We explain.
Gofo communicates this through his comms device.
Gofor - Manager says we haven't any in stock, what do you want to do?
Us - We'll have our money back.
Gofor communicates this through his comms device.
Gofor reluctantly refunds our money.