I don;t know if NativeBoinc or AndroBoinc are any help?

I just had the phone sitting there plugged in with wifi and data on for over 3 hrs and it barely managed to do anything.. maybe 5% or so.

I'm uninstalling.. boinc for Android is useless. It's a shame. It could crunch all night, every night, while it's charging.

7.4.53 is working fine for me, got a 1,300+ RAC at Seti with four devices: https://setiathome.berkeley.edu/hosts_user.php?userid=41965

Do know that 7.16.3 is an alpha and a bad one, it has a lot of bugs. It won't run on many devices. Even going back to 7.4.53 can then give problems - as one of my devices has all of a sudden.

But being able to crunch or not during the night is mostly down to preferences and some patience.

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I just had the phone sitting there plugged in with wifi and data on for over 3 hrs and it barely managed to do anything.. maybe 5% or so.

I'm uninstalling.. boinc for Android is useless. It's a shame. It could crunch all night, every night, while it's charging.

Wait, you want to run it from battery?
Make sure you have checked the 'advanced configuration settings' in Boinc.
There's a setting to stop crunching under a certain battery level or threshold.

More settings can prevent your device from working properly. Like CPU temperature, core settings, or cpu usage interval.

Even going back to 7.4.53 can then give problems - as one of my devices has all of a sudden.

Explanation:
When returning to 7.4.53 from 7.16.3 on my Huawei P20 Lite, the client experienced sudden shutdowns & restarts, calculations pausing when doing something on the phone, calculations pausing when BOINC itself was the only thing running,
refusing to autostart on charger connection, refusing to stop running when the charger was removed.

And that's with the preferences for Autostart checked, Pause computation when screen is on unchecked, Min battery level 20%, Pause CPU when usage above 100% (effectively disabling this setting). Whenever I do something on my phone now when it's charging, BOINC will suspend calculations.

Which may be fine, but upon stopping what I do, it will exit & restart the client, causing tasks to exit memory & restart from a previous checkpoint. It never did this before I installed 7.16.3, I've got 7.4.53 running on 3 other devices, tried on all of them to do some browsing, use Notepad, or watch Youtube and there none of them suspended.

90% of the time I plug in the charger, BOINC doesn't autostart. Although this may be something about the charger output. When I use a slow charger (0.5A), it will autostart, but when I plug in the fast charger (2A) it won't always reliably.
100% of the time though when I unplug the charger, BOINC will stay in the foreground memory, albeit suspended. Its icon will also stay visible in the top bar. And eventually Android will alert me that it's still using power. All that on 7.4.53, after having had 7./16.3 installed on that phone.

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Wait, you want to run it from battery?

Give your head a shake.