the remote unlock transmitter.
when i got my '16 crosstrek last year, i was impressed that it seemed to have about twice the range of my '02 legacy. (and it was nice to have the remote and key combined into one.)
but after a couple of months, i had to press it 2 or 3 times to get any action, so i figured it was time to replace the puny battery (in the legacy fob, the battery lasted about 5 years), because it was obviously being worked harder. or so i thought.
taking the sucker apart, i found the problem: the battery was fine , but the battery holder, instead of being soldered to the circuit board, uses 2 spring contacts. nice, if you expect to replace the battery holder, but 2 unnecessary extra points for corrosion, in an already low voltage circuit. considering that my pocket lint had already started invading the shell, what were they thinking?! (note to self: clean and reassemble the transmitter twice a year.)
i would love to see a much better designed "key", with a bigger battery (cr2032 instead of the cr1620), a soldered battery holder, and an easily (and cheaply) replaceable vinyl cover with integral buttons.
colour-matched to the car would be a nice touch.