battery replacement

My wife left her lights on for at least a week and so the battery in her Mini One is dead and apparently cannot be revived. I've tried charging it with a charger overnight several times the last few days and it gets enough charge to turn the lights on but won't turn the engine over - it just...

Hi: I'm new to forum. I have a 2016 mini cooper countryman S (park lane edition). The battery is dying. Local mini dealership is asking almost $400.00 to replace with only a 24-month guarantee. Local Pep Boys has replacement with installation for around $200 bucks with 3-year replacement...