8 or 9 minutes is nothing, though a lot of cars are in a pretty poor state right now after lockdown. I've just been through the charger malarkey on my V50 T5: first off the 'smart' charger was too smart for the dumb (but real Volvo) battery. Then I thought I'd bought a lemon after shelling out 50 quid for a tiny little box from Halfords: but I hadn't. It was just that it took THREE DAYS for the dumber charger to fully and properly charge the damn battery. So I think you might find you need to match up the age of battery to the dumbness of the charger. Also, when they are this flat, don't charge the battery on the car: the various background drains are enough to consume the trickle of current from the charger. At the least, take the terminals right off and give it a nice long weekend to get recovered.
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