What's the recommended max amount of books for Bloom Reader?

We’ve been asked to push more than 750 ‘Talking books’ into Bloom Reader. We never tried anything beyond 400. Does anyone have experience with this much of books in Bloom Reader?

We’re also planning to ‘run’ them from an Sd-card and not place them in the internal memory of the phone. We use class-10 Micro Sd-cards.

Wow. That’s a lot of books!

Sorry, I don’t know that answer to your question, but someone else will. Meanwhile, as Bloom tester, I would be very interested in obtaining a copy of the SD card contents for testing on a variety of devices. If it’s possible, could you send me that via Google Drive privately? We’ll put it in our test folder.