Go to "About this Mac" -> System Report -> Power -> Battery Information and see what it says your battery health is.
You say the battery is "a new battery with very few charges." If its around or below 80, there's part of your problem . FYI "charges" don't actually matter that much. A laptop that's plugged in all the time can have a low charge count and a heavily degraded battery
If the battery is not "degraded" as this is a 2016 model the question then becomes.
If it is "new" was it replaced by Apple, an Apple Authorized Service Provider (using genuine parts) or a third party (who may have used non genuine parts) ? If it is the latter that could also be part of your issue.
Your real problem however, are those 80 tabs you have open in Chrome. Chrome is relatively power inefficient on macOS. Switching to Safari, if that is an option, or another more power efficient browser would likely help to a degree, but with 80 tabs(!) open there's only so much you can do on a 2016 Intel Mac. Those CPU's just weren't built for power efficiency when running that many tasks concurrently.
If upgrading is an option an Apple Silicon Mac would do much better. Alternatively if Chrome is a requirement you may also be better served by a physically larger Windows or Linux laptop with an AMD Ryzen 6000/7000 chip (Intel tends to be more power hungry) with room for a larger battery. Honestly speaking, regardless of what you choose, if you want to run on battery for an extended period of time you probably need to find a way to bring that tab number down. I won't pretend to know your use case but 80 tabs sounds excessive.
