Di2 upgrade, battery OK for aero seat post?

[oldgreyandslow]

I'm considering upgrading to Di2 ultegra and wanted to check the battery will fit OK in an aero seat post?

Any advice appreciated.

Thanks

 

[JhnBssll]

Mine is fitted in an aero seat post. I bought a Ritchey rubber mount and trimmed the ribs down to the right shape for my seat post, works a treat.