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@Brommers
Very nice! I don't think I could use the standard seatpost battery as it's 17mm in diameter and so won't fit inside the very slim S2 seatpost. The standard Di2 battery cells are 14430 LiPos, and have a diameter of 14mm, so the modded Di2 battery is just over 14mm in diameter (14mm + heatshrink and tape) and only just fits inside the seatpost.
Do you know how the SM-BCR2 charger connects up to the rest of the Di2 installation to update the firmware? I know the standard PC adaptor, the SM-PCE1, has a standard Ultegra Di2 plug which goes into one of the spare sockets on the shifters, but the photo here seems to show a different kind of connector on the SM-BCR2.
If the SM-BCR2 charger can do everything that the SM-PCE1 does, then I might be tempted to buy one myself at that price, even though I'll never use it as a charger.