Question : Problem: Dell Optiplex 520's Amber powerlight and battery replacements

Computer Model :Dell Optiplex 520
Issue(s): Amber blinking powerlight / Battery needs replacing

Two seperate issues, yet in same building. Here is what I am wondering; This is an older building, could wiring or power surges do something to these PCs?

Blinking orange lights- several 520's just shut off during the day- power light blinks amber; Power OFF machine, reseat memory, machine is up and running. Can run fine for hours or days, then just SHUTS off, power light blinks amber.  Power off machine power back on- machine may be fine for hours or days.
Power supply? And if so, this is happening alot in this one building with these particular machines....5 of them now. Is this common for Dell's?

Battery replacement- same model machine, same building- 3 of them already that are maybe a little over a year old. What would cause that battery to need replacing so soon? Just the Dell model?
I have a Dell now for 5 years- its on almost all the time- never had to replace the battery yet.

Thanks in advance to any suggestions/comments.

Answer : Problem: Dell Optiplex 520's Amber powerlight and battery replacements

It's very possible the power surges/drops could cause the issues you're seeing, including the battery replacement.  

For the 520's that are just shutting off - I'd recommend putting them on a ups's.  Cost about $20-30 per pc.  In addition to providing power backup, they will also smooth out any power fluctuations.  Wouldn't hurt to do the same for those that need battery replacement.  Power fluctuations can cause early battery failure.  You may also want to check with Dell to see if they've been having any recurring issues with those batteries.  

I'd also recommend having a good licenses electricial check out the power quality in the building.