You can tell them that if you can tell them exactly why you know it to be so.

Next time you're there, inspect it and write up the inspection but don't tell him unless he asks what you're doing. Note especially the position of the battery under its clamp. Then if you're called back for a problem, note if the battery has moved. I found with a T2+ that a drop will often cause the battery to slide under the cover, and the more it has moved, the worse was the incident. One T2+ with a broken battery terminal might have been broken from the battery pushing sideways against the connector. Better remote design would have prevented the battery from moving -- an indentation in the surface for the battery to nest in -- but anyway, this is a great crash and smash indicator.