Just spent 2 hours getting all the batteries out of my TFs. Most of them are super easy. MP 01 & 04 were bit of a pain though as one crucial step in the instruction was explained only in words and not in pics, and I can't read Japanese. I've managed to figure it out by extremely careful mild exertions. The whole process involved partial transformation and dismantling parts. And as a side effect some other parts accidentally fell off too. Fortunately there's been no damage or new stress mark, and the fallen parts are easily reattached.

Anyone having trouble with their MP 01 & 04 batteries, I'm happy to help!