So this car battery is been charging for 15 hours and still the full indicator on the charger doesn't glows ,instead it keeps charging with voltage going as high as 15 volts.
Beleeb C15 Multiple Voltage Battery Charger 6V 8V 12V 24V Lead-Acid Lithium-ion Batteries, 15 A Automotive Car Battery Charger and Desulfator for Golf Cart Motorcycle Truck Lawn Mower : Amazon.ca: Automotive
Telwin Touring 15 Car Battery Charger , best deal on AgriEuro