Excuse me for butting in... (I don't have a HH or Inspiration but saw Marks post starting the thread and wondered if I might have a chuckle at another life and death tussle with his electronics at depth I wandered in...

)
Considering the HH is a finished product... I can't think of another piece of dive gear (with the exception of a camera in a housing perhaps) that needs such a constant supply of new batteries and constant drying, wraping up, greasing of things etc.
I know the single AA approact makes things easy when finding a replacement in far off places is involved but it seems a right royal pain in the backside the rest of the time?
Surely one battery for the handset that lasts ages and another larger battery elsewhere for the solenoid makes more sense?
That way the handsets never/rarely fail so you know whats going on all the time and the solenoid should last a trip instead of a dive, if it gets wet it should still work when you finally do get to dive and as both have batteries you can pick something suitable for each rather than something that struggles with doing both?
I realise that that would mean a complete redesign so of no real help.... sorry
I've been watching the HH for years now, except for the battery issue it seems pretty sweet.
BEN
Battery life depends on the type of battery... if you use the correct 3.6v lithiums you generally get 2-3 weeks of diving everyday.. If you use aa alkalines you should change them everytime you change the scrubber.. You can get away with less frequent changes in warm water, but in cold water alkaline batteries lose about 50% of their capacity..
as to battery, Kevin can use just about any power source (non rechargable that he wants) its all a matter of the battery connection.. The PS will work with any voltage from about .9v to 10v