I shot a new years eve party last night with my 285hv. It worked great - until I changed batteries. I was using 1.2V 2000 mah Duracells from wally world - those worked - I was firing at 1/16 and 1/32 power. Then I put in some fresh regular AA's to use to fire at 1/2 power - I got quite a few shots from it that way. Then I went to put in more regular AA's and the flash wouldn't fire. Then I tried some Energizer 1.2V 2700 mah batteries - no go. I started thinking my flash was broken. Then I put the first set of rechargeable and the flash worked. I don't know what happened. Has anyone else experienced this?