Comments about Vivitar Vivitar 285HV Non-Dedicated Shoe Mount Flash Kit, with 4 AA Nickel Metal Hydride (NiMH) 2300 mAH Rechargeable Batteries with with 2-Hour AA & AAA Quick Charger, 110/220 volt & Car Charger:

Love the flash...solid product for a good price. I bought this "package" because it is the same price as the flash alone, so I got a battery charger and rechargeable batteries out of the deal.

The batteries however are larger diameter than standard aa batteries so they have a hard time fitting into the flash AND they appear to be incompatible with the flash itself. I could never get the unit to fire reliably with these batteries, had to resort to standard alkaline AA's to get it to work.