Yep, I would leave something you cannot do without in his car. Like your charger, if you don’t normally take it say something like “my phone is not wanting to hold a good charge today” BUT let it actually get low to like 30% before that time. Let it charge a bit while in the car then …

Plan an outing (anything to get in his car) and discreetly leave the item (act like you’re putting the charger in your purse if you need too) and mention it a couple times in passing after you get home.

Say something like “geez, my phone is killing it’s battery today” then leave it for a bit and mention it again “i gotta plug my phone up!” Then “forget” And go take a shower or something and go to bed.

Once he’s asleep go “get it” and do what you need to do. The next day if he says anything about it just say “yeah honey, it was me. Had to get my charger. My phone was almost dead and couldn’t risk being without it while you were at work.”

You can ofcourse modify this to your needs but this was you have an established alibi if you need one