Not powering on after battery replacement

After replacing battery, ipad worked fine- proceeded to calibrate- it slowly charged battery up to 100 and 2 hours after without interruption- used ipad until battery drained- now ipad wont power on- charged it for 48 hours after drain- tried volume up and down and power button presses- also power button and home button press and hold process without any effect.

Havent tried plugging into laptop- no access to one atm