Here is a quick observation.
If you changed the battery per the instruction and the battery was not charged the next day, you may have a poor quality tablet. May I suggest you reconsider your choice and consider making an exchange with the vendor while;e you have time.
Here is a recent review of popular l tables.
Top 10 Best Tablets Reviews Jul 2014IMHO the above link does not have enough detail.It looks like and ad fort Amazon. Nevertheless, Amazon is a fair vendor. Still, I think you would do better going to a local vendor and see what return policy they have.
EDIT: Battery change an d discharge is often poor for many devices. Here is a link that I think is helpful.
Battery Tips for Your Smartphone or TabletOne of the notable tips given is to NOT turn off your device. Let it take a nap with the WI-FI off and no apps running. They claim you consume more power by frequent on and off cycles.