Battery Problems. My mac ocassionally turns suddenly down.

I recently change the battery on my macbook pro.

I put a "new old stock" mac battery (date of fabrication 2013 according coconut).

I had some troubles after the first installation so the laptop could recognize it. I plugged the internal connector on and off several times. Finally it started to work properly, but some days before the computer suddenly turn down and all the battery test lights started to blink. I plugged the laptop and turned on right, but without battery (no charging, no coconut detection, and an x inside the battery sign), and the magsafe test light turn green.

Some minutes after plugging it, the magsafe light suddenly turned orange and the laptop recognised the battery, i run coconut and everything seemed normal. Now from time to time keeps making the same thing.