Board Thread:Questions and Answers/@comment-68.144.4.103-20141226072740/@comment-27095444-20170201152356

"Are you seeing any notices about HGT errors when you enter the Cat Base screen? This can happen if your phone/tablet clock has been manually changed, if you traveled to a different time zone, or if your network connection was particularly unstable during the daily update. Don't make any further changes to your time settings, and you should start receiving your energy and login bonuses again soon.

If the problem doesn't solve itself within another day or two, you might try clear up some memory on your device. If you can uninstall some unnecessary apps, clear your cache/temporary files, and restart your device, sometimes that helps to solve these problems. **Be VERY careful not to delete any Battle Cats data without starting a Save Data Transfer from the Settings menu first - we won't be able to help you recover any of your progress/purchases!**" - message from PONOS support.

Anyway, most likely you will need to wait two more days. Same thing happened to me and I had to wait  three days in total before my energy starter recharging again.