I've never been confident that the built-in 4 AA battery backup was sufficient. Nice feature, but just not burly enough for my belt & braces mentality. Meanwhile, the feed-through ups on the hub has been doing great, so...........
https://www.amazon.com/dp/B09KCB11Z3
This replaces the 9 Vdc power supply. It comes with a 9v cable that fits the LS 's (ver 1 & 2) female barrel jack. Even the polarity is right, imagine that! Everything worked right out of the box.
Valve versions: Leaksmart water valve? - #24 by aaiyar