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I bought an Aladin Prime in 2005. Never used it (I just go with my old Pro and Sport). A week ago I decided I might take along my Prime on a dive in order to get a temperature reading (the old Pro and Sport don't offer temp). The Prime wouldn't boot, not unexpectedly, on a six-year-old battery. So I changed the battery and it booted up perfectly. The next day it was dead. I took it to my dive shop and they changed the battery again, and also put in a new O ring. It booted up perfectly. The next day it was dead.