On 03/10/11 10:56 AM, Les Mikesell wrote: > How important is the card-level battery if you have a UPS and a scheme > to monitor it and do a graceful shutdown before it fails? how important is your data? if your system *never* crashes, and you're not running something like a database server dependent on committed writes, I'm sure you'd be fine. me, personally, I've had to recover from DC total UPS failures. I like to put redundant power supplies on alternate UPS's, but with datacenter sized UPS's thats often not an option.