I have replaced the battery in 2019 with a new one bought from this store and your manual worked pretty well thank you!. Now my macbook has problems again. When I connect the PSU it starts booting by itselfs and then runs into a reeboot loop of death somewere at the greyscreen load up. When I unplug the PSU during the boot up process it imediately dies like no power is connected. When I disconnect the battery it boots up normaly. SMC and NVRAM reset did not solve anything. Diagnose Tool reports memory fault, I replaced also the RAM, now diagnose tool does report all OK no errors. But it still does not boot. Do you think the 2 years old replacement battery is died again? How can I find out? Thank you for your help