Welcome new guy!

My mention of diablo turbo, asui, cssu and cloning is valid...
especially for those individuals with older batteries that haven't gotten up to speed with having the most recent n8x0 setup.
The benefits of which massively outweigh not updating to the most recent setup. The least of which being longer device lifespan.
The only reason to have a pristine untampered diablo (or chinook) install is to test with or to clone to card with.

If you are using stock diablo os2008 with a brand new polarcell...
You aren't getting the most out of your battery...you are losing (hummm).... ...half a day's worth of additional battery charge (in use time...more in standby)...( roughly ) you could have. That is the gain of the tweaking.

My best suggestion for new people to the NIT is:
1-Install nothing yet until you do these steps 1st (makes it easier to troubleshoot errors from a clean install also less chance of conflicts).
2-If you have installed stuff...reflash to a pristine diablo state.
3-by enabling maemo extras (the benefit there being that enabling this repo. will allow you to install a ton of programs you normally can't otherwise... as well) install rootsh. Application menu calls it xterminal. If you are unfamiliar it. It gives you a lot of power over your device and system.
4-next install penguinbait's console tools v1. this allows you to do a hellava lot of stuff ...least of which is stupid easy thoughtless multiple choice format of partioning, formatting, os cloning to internal or external card, and os backup to card or usb, and that is just a tiny bit of what it can do...very very helpful for people new to n8x0.
5-clone baby clone. Then install asui, latest diablo cssu, diablo turbo to the diablo clone on the card...(the tweaks patches and fixes make it well worthwhile.) Then install gronmayers repo list. (sooo many programs now )
Away you go ...(well there are a ton of more cool things to optimize... but that's the basics)
(Me ...on one of my n810's I got a pristine diablo on device (I never use since cloning) and a 32gb class 4 card with diablo turbo on one partition, debian on the 2nd, and mer on the 3rd.)

Sure you are getting a day out of your brand new polarcell on stock os2008.
I get that with normal daily usage with all the updating to the latest os and the patches and power management tweaking ...
the difference is you are using a brand new polarcell.
I'm talking about my using refurbed rejuv'd original batteries (some with a charge of between 70% and 90%) all that are no less than half a decade old and that have been in use daily ...and I'm getting the same output as you.
If you get up to speed ...
you'll be able to do alot more with your device...
it'll feel a 1000x more responsive...
you'll have fewer probs....
it'll save you alot of wear and tear on your device in the long haul...
you'll utilize the optimum of your battery's charge ..
and you should be able to go a lot further...alot longer on a single charge with your brand new polarcell ...

technically... with a new polar ...with the tweaking... you should get at the very very very least...with your device running full-out... 10 hours of constant use (depending on how intensively draining the programs are of course) ...at the bare minimum....
technically ...your battery monitor should be pushing the ceiling for a while before you start to notice a drop in capacity/ time remaining.