HI ,
i'm looking to buy a R8050 Di2 groupset , my frame don't have any kind of internal mounting , so only option is to go with external battery "SM-BTR1" and external battery mount "BM-DN100" , i'm buying SM-EW90 Junction A with the group .
Now , i'm curious about 2 points :
1- As per my understanding , BM-DN100 is enough for the syncro-shifting to work , even if i'm working with older model external battery "SM-BTR1" Am i correct ??
http://carltonbale.com/shimano-di2-e...omment-page-8/

2 - I'm not buying the wireless unit , i'm looking to the ability of customizing my group via e-tube pc app ... Can i use SM-BCR2 charger with the "BT-DN100+SM-BTR1+SM-EW90 Setup" for charging battery through Junction A and connecting group to PC ?
R8050 manual shows SM-BTR1 is to be used with SM-BCR1 , However , e-tube compatibility guide shows that BM-DN100 is compatible with SM-BCR2 ..

Please advise