Replacement battery now not recognised after 4 days of working
Mid 2012 Early 2013 Macbook Pro Retina 15
Replaced my battery using the ifixit replacement kit
All was working well, recalibrated as instructed and no problems running.
4 days later was using macbook and it went to sleep at around 18%
Plugged in cable but then wouldn't switch back on.
Left to charge, battery light shows orange. A few hours, still dead, overnight too.
Turns on by holding down power then plugging in cable trick, works but battery icon appears with cross and then disappears altogether when logging in.
Coconut doesn't show a battery as present has 0's for all stats and a date of 1979 for both mac and battery.
Tried SMC + PRM reset, removing and refitting battery and even fitting the old battery which is also not recognised (however this one was well and truly dead anyway)
Dud battery or is there any tricks left to try.
Would post screenshots but Mac now won't switch on at all, can hear the fans kicking in but sounds like they are instantly shorting out and then back on repeatedly so guessing there is an issue somewhere between the laptop and the battery rather than the battery. This is as soon as the MagSafe is attached before any button is even pressed.
Thanks for the advice so far! Tempted to take it in and and report back on what they have to say.