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@Alan_tbt
The first one I had snap that was definitely user error. Since then the snaps are all on the rear. The latest snapped when riding over some rough road. It did not break entirely, just enough to create a gap between the connectors.
I have heard others have a similar issue and put it down to the mounting being metal on the rear and plastic on the front (which is more flexible).
https://forums.roadbikereview.com/sram/sram-etap-battery-tab-broken-battery-falling-off-rear-derailleur-361263.html