I have and Early 2011 17 inch MBP and have intermident "replace now" for the battery. After this I have a sequence of reboot loops. PRAM and SMC have no immediate effect. Typically if I let it sit overnight and then plug it in it will finally complete a boot sequence. After that the battery shows good condition. IIRC there are only 62 cycles on the batter and near full capacity. Even when it says 'Replace Now' coconut will show good readings but the logicboard stops using the battery and operates souly on A/C Memory has been replaced and difference HDs substituted with no effect. I noticed last that the 'replace now' is hit as soon as it charges to 100%. Curious if this has happened to anyone else. I dont want to waste the money on a battery replacement just to test it out but othere than that and replacing the logi board, there isnt much more that can be done. Just a note, I put ML on last night so curious if it stabilizes the situation. Thanks!