I've bought my Marty a pet robot cat and was thinking about using Marty's battery for the cat to reduce expenditure, avoid pointless accumulation of batteries and to not have any 14500s as these things look very easy to mistake for AA.
Some questions came up about how it charges which made me wonder how that works. There's something about balanced charging with multi-cell LiPos which sounds like an attempt to either reduce risk or to individually charge each cell. How does this work with Marty's 2-cell battery which only has two connections? Does Marty adopt a conservative approach to charging to reduce risk here? Is the battery pack you use carefully cell matched at the factory?
The discussion on this is in the recent (11-Feb-2019 onwards) comments on: https://www.indiegogo.com/projects/nybble-world-s-cutest-open-source-robotic-kitten#/comments