I just got a new macbook battery and it's not working in my macbook or rather, not even recognized. My macbook had a battery that worked for 3 years and then about 2 months back bit the dust (900 cycles). For the past 2 months I've used the computer plugged in. I have confirmed the new battery works because I'm using it in another macbook right now? Any ideas on what else could be the issue here? Something with my connectors maybe? Pram Battery? I've tried all the usual stuff. I've also tried another functioning battery and I got the same thing. No batteries connected. Thanks in advance for any advice.