Hello, here's what I do with my TWS earbuds and TWS adapters (like FiiO UTWS3/5) or really Bluetooth/wireless/rechargable/etc. stuff in general: I try to only charge it when it has no battery or will have no battery soon.

So if I am going to eat, I just either turn off the TWS earbuds/etc. or like leave it playing. Do not eat with TWS earbuds or IEMs inside your ear btw, it's not good for your health/comfort.

And yes if your TWS earbuds or Bluetooth devices have app support sometimes there'll be settings to set it to 80% battery life or something like that to prolong the battery. This will help preserve the long term battery life in theory.

So for now just keep playing if you want to maybe save the battery life in the future. But most people will not mind the disposable nature of TWS earbuds or Bluetooth stuff and so they'll be surprised when it has way less battery life within 1-2 years.

Realistically, people are always doing that recharging habit though. It's actually very rare that people are like me where I will use the TWS earbuds/etc. without ever taking them off.

Most TWS earbuds/TWS adapters/etc. last only say 5-6 hours in practice despite claims of 8 hours or so. This depends on if you're using regular AptX, LDAC, etc. And like how loud you listen too.

Always make sure you have that perfect vacuum seal in order to save your hearing health and also to get more batter life out of the TWS earbuds.

You have to specifically look for TWS earbuds/Bluetooth devices that have long battery life if you want legit 8 hours or so.

Try Spinfit W1, FiiO HS18, AZLA SednaEarfit XELASTEC, Dunu S&S, etc. ear tips for possibly better fit/seal, noise reduction/isolation, and comfort.

You can use ear tips for wired IEMs with TWS earbuds (and vice versa) but they'll probably be too long/wide for the TWS earbuds case and so it won't charge at all, you'll need to remove the ear tips each time.

Try Spinfit CP360/CP1025, AZLA SednaEafit MAX for TWS, etc. Those are specifically made for TWS earbuds, they usually have adapters for weird nozzles like Apple, etc. devices.

There's also Final Audio E for TWS ear tips. The smaller sizes of the regular Final Audio E ear tips (it's $15 for the 5 sizes multipack on Amazon) for wired IEMs should also fit inside TWS earbuds cases. Check Audio46 (this is from New York) if they have the Final Audio E for TWS version in stock.

The dimensions/sizing/measurements/etc. for most ear tips these days will be on Amazon/AliExpress/HiFiGo/etc. Unfortunately you have to blind buy the ear tips in order to get a feel for the dimensions/measurement/etc. that you like for your ears. Remember, this will also change with different IEMs as they'll have different nozzle length, nozzle angle, and so on.

Here's a bit more info on ear tips: https://www.reddit.com/r/HeadphoneAdvice/comments/10k210n/alternative_tips_for_aria/j5o2f8q/

This is how you should use Etymotics or really any IEM or TWS earbud to make sure you have that good/perfect fit for that vacuum seal (necessary for the bass to be properly produced): https://www.youtube.com/watch?v=8KwXEqe6Gq4

For TWS earbuds, see here for more info: https://www.reddit.com/r/HeadphoneAdvice/comments/10hdr2p/are_there_any_wireless_earbuds_witouth/j58keli/

Click through those thread links if you want to look for cheaper (<$50) TWS earbuds for specifically gym/running/etc. use. Look for the ones with IPX5/7 water resistant or waterproof ratings. And ya always wipe the ears and IEMs with a clean paper towel or microfiber cloth so that it doesn't get clogged and also because sometimes the gold charging ports will be covered in sweat/dirt/etc. and it won't let the TWS earbuds charge properly.