Originally Posted by anthropic
I've had batteries go bad before, but never when the display showed them as good. Will try changing batteries to see if it helps.

I bought one of these about 10 years ago and it was worth the money.

https://www.harborfreight.com/100-amp-612v-battery-load-tester-61747.html

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).