The manual says it should lasts up to 5 hours of use, and if you use it 15 minutes a day the battery life could be expected to be 27 years.
We all know that this is never true. I bought my Muse 3 months ago, knowing that I should expect the battery to survive to 2 or 3 years at most. So I would'nt care having to give it to a friend who lives in USA (btw, to where my Muse was shipped to avoid my country's abusive customs charges), and waiting 2 or 3 months to get it back.
I'm starting to notice that my Muse's battery is droping much faster now - fully charged, connect to MuseLab and it shows 92%, and after abour half an hour drops to 50%.
I have saved files since the first week and will do some plots soon, comparing the discharge progression at the begining and now ... will post in a few days here.
Its unbeliavable why manufacturers still do this. Devices that are sold all over the world should have a battery slot with a cover for easy replacement.
Making money from battery selling is a shame. I could imagine it from those cheap chinese manufacturers (I love chinese people, but not their bosses), but never from a Canadian company, specially because canadian people are well known all over the world for their honesty !
Many countries (like mine) have a lot of customs burocracy, and sending back to the country of origin is not an option - also, many does not have enough market selling to justify having a technical partner in it.
I know I will be losing my warranty, but I'm almost sure I'll have to disassembly it myself to see what can be done ... I'm lucky I'm a graduated electronic engenier, but I know also that this is not enough case the battery is one of those that has a chip in it with proprietary code ... there's allways the option to plug it into a logical analyser, but we never know what we can get.
Let's see what will happen.