I just received new Dell Inspiron 5559. During installation windows I found my battery backup availability 70%. i started windows installation and plugged in charger but battery didnt start charging. Laptop battery charging led indication was off and battery icon showing unplugged while my dell charger led is glowing. After half an hour laptop charging led indication got on. Now when I start charging it doesn't take place charging immediately. It starts charging after 20-30 mins. May help pls.