and the rechargeables - at least for my outdoor PM sensor - has a micro USB plug that I plug into a block that plugs into an electrical outlet to charge (it also charges via a solar panel across the top but in winter, the sun angle doesn't charge it enough so I have to bring it in to do an AC charge).
I have a Nitecore Digi D2 that does all kinds of rechargeables (and sizes) including Li-ion -
My weather station has a small solar panel on it to charge during the day and the current one is in full sun and has been out there for 5 years now, so I haven't had to manually recharge the batts yet. On the other hand, the PM sensor has a smaller solar panel across the top and is in an odd location so it doesn't get as much light as the weather station (thus have to manually charge those batts about once every 2 months, where the solar does do some charging).
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