AlbertJP - you think it is not helpful and/or spam to tell the truth to potential buyers? This is a big issue for many, many FP2 users - just look at all the posts on the subject, including not least in this 462 post thread under the title “FP2 Battery Problems (drains quickly, CPU gets hot)”.
Moreover, it is reasonable to expect that, as a class, future FP2 buyers will be less ethically-minded than existing owners. (Future buyers have not already searched for an ethical phone, or already been motivated to buy when hearing/seeing the message, etc.). So, over time, FP’s customers can be expected to become less and less forgiving of FP’s faults. Not discussing these faults openly now may help - somewhat unethically(!) - to sell some phones in the short-run, but in the longer term it will surely kill the FP project.
Btw, I do not use Facebook and have only a few apps installed other than the factory-installed apps. Of course it could be just one app that accounts for battery drain, but no apps - factory installed or downloaded - stand out as big battery users. Looking at my FP2 now, the only exception perhaps is Google Play services at 6% of battery drain, against “phone idle” and “mobile standby” each at 8.5% of drain. (A total of 4 other apps use 2% each, so 8% total.)