My controller keeps flashing blue multiple times on a charger but not?

So when I go to turn on my controller when plugged in and connting via Bluetooth it flashes blue multiple times then dose nothing and goes back off, when not on the charger and on Bluetooth it does nothing. Then when (the part I ran out of space for) I connect it via wire to my tablet it works so I know it's not the port I,I don't think it's the battery, and I don't have any issues that could be solved by a reset (the charger definitely has enough watage). Also when plugged in to charge it doesn't slowly fade in and out yellow