add another pic to nas ups

input/projects/nas_2018.md

 description: FreeNAS / TrueNAS based x86 server
 parent: projects
 date: 2018-03-01
-update: 2023-05-18
+update: 2023-05-26
 comments: true
 ---
 
 So please replace your UPS batteries more often!
 ⚠️
 I don't think the charging cuircitry in the UPS is taking good care of healthy battery management...
+
+<!--%
+lightgallery([
+    [ "img/nas_ups_bat_4.jpg", "New battery before being installed" ],
+])
+%-->
+
+Installing the new battery was quick and simple.
+The UPS immediately started working again, as I had hoped.