How about a grease cartridge thread?

[90cummins]

Which type of bucket cover/grease gun filler is it.
One with the hand pump that the stem goes through the cover and the follower plate, that pumps into the larger fitting on the grease gun head.

The one with the hand pump

 

[4570Man]

I've found that the trick with battery-operated tools is to NEVER store the tool with battery attached. Store the battery separately from the tool and it will be good to go even a year later.

If you’re using the old 18v dewalt tools with an adapter to use the 20v battery those things will flat kill a battery. I’ve had zero problems with the 20v tools killing attached batteries.

 

[Fallon]

Also, never store a lithium-ion battery fully charged.

Tesla, Ryobi (and maybe others) warn that for long-term storage, a charge of less than 75% is recommended for longer battery life. They define long term as more than 30 days. When I first started using Ryobi 40 volt tools, I always brought them up to 100% charge and when the first battery failed just after the 3 year warranty ended, I discovered by reading the instruction manual about the storage charge vs usage charge.

I now use a home-made device that stops the Ryobi charger, when the battery is at 75%. If I know I will need heavy use of a tool, I will bring it up to full charge first. My batteries are now lasting 6 years and still going strong.

Tesla does use a couple different lithium battery types. My long range (and performance) uses Nickel-based (NCA or NCMA), the standard range uses Lithium Iron Phosphate (LFP)

Tesla recommends 50% for long-term storage, at least on my NCAs. For daily use charge to a max of 80%. Only charge to 100% if you are about to go on a long trip or need max range. Avoid sitting close to 0% or 100% if you can help it. I've got a Model Y, so have looked at their recommendations a fair bit.

LFP should be charged to 100% at least once a week, but I think that's more to calibrate the charge controller. Avoid leaving it at 100% for long periods of time, but Tesla doesn't recommend the 80% threshold as with the NCA packs.

Not all lithium batteries are the same & may have different charge preferences. You need to dig into the details for each battery. I'd be surprised if my normal Ryobi batteries didn't have a different optimal care profile than my Ryobi HP batteries. Not that I'm motivated enough to check, much less maintain them differently.

Personally for tools I just leave my Ryobi batteries on the 6 port chargers I have in the house or shop. Probably not the best for max life, but I don't have the monitoring tools much less time to constantly wrangle the pile of batteries I have around. The Tesla has the tools to easily monitor & charge to the proper percentage. Not to mention being a lot more expensive.