What sort of circumstance could possibly make buying cheaper compatible batteries unethical?
- Did you make an express promise to only buy brand-name batteries? (I.e., are they paying you money to showcase their brand? Did you lease or rent tools with a contract that specified brand-name-only batteries? )
- Are you spending someone else's money who wants name brand batteries?
- Are the third-party batteries illegal in your country?
- Is there a known greater ecological harm in the manufacture of the third-party batteries?
- Are you expecting to have your power tools be harmed by the third party batteries and returning them for warranty repair you caused?
For a typical consumer in America, and likely most professional contractors, the answer is "no" to all of these. And DeWalt apparently only offers a one year warranty that specifically excludes "normal wear and tear".
https://www.dewalt.com/en-us/support/warranty
Anything up to and including prying open the proprietary casing and swapping in new cells is entirely ethical.
Wherever you are on earth, regardless of season, the only stars you don't see at night are the ones blocked by that rock you're standing on.
ISome of the stars rise or fall under the horizon as the planet spins, and which ones of those you see can and do vary based on the season. These are the ones that the earth (and the sun) block due to the orbit of our planet.
There will be stars due north or due south that you'll see all year. This part of the sky isnt blocked by the earth or the sun at all. In fact, if you use a camera with the right hardware to see through the diffuse sunlight that makes the sky seem blue, you could see the same small disk of the sky at any time during the year, regardless of season or time of day.
Note that the above assumes you're in one of the temperate bands between the tropics and the polar bands, where sunlight varies throughout the year but every day has a night.
On the poles you only get one night a year, and it's always the same stars. And on the equator you need a clear horizon to see the polar stares, while the seasonal constellations will be more or less right overhead.