geoffkatt, i had to laugh at your reply, 'most things don't last 10 years' - hmm, you must buy some pretty crappy stuff. my speakers, amp, preamp and DAC has all lasted over 10 years. Of course that is assuming the battery last 10 years which is an unsubstantiated claim. to say it doesn't degrade wouldn't you need to know the draw and voltage required of the IQSE.
ozzy, are there any markings on the battery?