I have had the pleasure of a light dimming to the point of uselessness on a night dive. I just linked arms with my dive buddy (wife) and enjoyed what she wanted to look at. It was a boat dive in Cozumel, great viz, well supported- no big deal. We have a live aboard coming up in November to Belize- lots of night dives (and I now own a backup just in case.) I was wondering, I you are doing frequent night dives like on a live aboard- how often are you changing batteries? Before each dive? I own a DRIS 1k (not the shorty) and a [FONT=Arial, sans-serif]Intova IFL-WA-ZOOM (this was the one that lost power.) FWIW i did a search and couldn't find anything relevant. Thanks in advance.[/FONT]