Button cells can only put out a very limited amount of current. After that their voltage drops. Try measuring the voltage across the buttons when it's running.
For stuff like this I'd use an old phone charger or AAA batteries.
Button cells can only put out a very limited amount of current. After that their voltage drops. Try measuring the voltage across the buttons when it's running.
For stuff like this I'd use an old phone charger or AAA batteries.