There are some people at a certain rom site that are working on a patch right now. Who knows how long it'll take, but they think they know where the AP comes from.
It worked when I had the original Japanese ROM with the AP patch.
Gonna test this one on my R4 with YSmenu. Unless someone did so already, did that work?
The thing is that the IATA rules impose a pretty hard limit of 100Wh on battery sizes for lithium batteries - and it doesn't look like Li is going away soon