Yes that's fine if you have accidentally left your lights on and your battery has gone flat. It is no good for a maintenance charger. By the time spring comes and you get the car out the battery has gone past a recoverable state and it's then another £100+ for a new one.
Sorry if I am ignorant... Why would you buy such bulky chargers when you get portable jumpstarters for the same price? The jump starter fits into the glovebox and are of less hassle. I was under the impression that such battery chargers were outdated technology. I once had to charge my car's battery using my friend's charger which involved removing the battery from the car, charging the battery overnight at home, re-fitting the battery back in the car. Means you cannot start your car until the battery holds "some" charge and was too much hassle carrying around a heavy battery. With a portable jump starter, you can start your car instantly and it costs almost the same in the market(see link below). And I do not have to remove, refit the car battery. Absolutely no messing...The charge on the jump starter is good enough for like atleast 5-6 starts. https://www.hotukdeals.com/deals/ravpower-10000mah-car-jump-starter-for-upto-3l-petrol-engine-inc-flashlight-usb-charger-25-year-warranty-3099-delivered-amazon-svt-3089075
No, but I am a motorist since 2008 and never had to use that thing... and I am not using my car everyday, at times 2 weeks gaps
My car battery has not been replaced since it was manufactured which was in 2007.
You'd do well to get 10 years out of a battery! 5 years tops in my experience. Though with care and regular charging this can add a few years to their life. It's more important for cars that are only occasionally used.