how bad is bluetooth on a phone's battery compared/in addition to mobile data?

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Depends on the implementation and what you are sending.

context: bitchat

I think this can be done quiet effectively because you are not sending large data packages

yeah, but just the thing of bluetooth being constantly active

Don’t think that’s a problem. Have a look at modern iPhones they are using bluetooth constantly for the airtag network without anyone even noticing

huh, good point

Bluetooth is made to have really low power use. You probably won't even notice the battery difference of it being on. A consequence of the design is that it can't send lots of data at any reasonable speed.

appreciate the insight 💜

depends whether it's connected to device or not, if it's not connected it doesn't affect much