I tend to forget to unplug my battery charger. This $10 timer was the solution — set it for 1-6 hours depending on how much charge you need: BN-LINK 12 Hour Mechanical Accurate Countdown Tim...
Thanks for the info Dan, this is exactly what I was looking for. I just plug the chargers into my batteries, turn the dial to how many hours I want, and I'm done. I use a grounded three-outlet power tap so I can plug two things in at the same time without a power strip. One outlet of the power tap faces the wall in this position, but it leaves two open outlets.
If anyone else is interested, the full link is below
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https://amzn.to/3c7xUPx
I use a smart plug into a power strip with the chargers plugged into that. Then use the countdown feature on the app.
https://amzn.to/3vJ58Nb
I also use a smart plug, but one attached to an Alexa. I named it "charger". Then I just say "Alexa, sleep timer 6 hours with charger".
Smart plug sounds like a great idea. Downside for me is when I travel with the bike.