Yes, the combination will work with a 10 speed cassette. Shimano has a quite comprehensive compatibility chart for Di2-stuff: http://e-tubeproject.shimano.com/pdf/en/HM-CC.3.0.0-01-EN.pdf.
Thanks. I can't tell from the chart, is RD-6770, FD-6770 compatible with BT-DN110 (internal battery)
Yes
@dst2 started
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Yes, the combination will work with a 10 speed cassette. Shimano has a quite comprehensive compatibility chart for Di2-stuff: http://e-tubeproject.shimano.com/pdf/en/HM-CC.3.0.0-01-EN.pdf.