Will it use more system resource?

And it's slow.

no one said ppl buy that to replace the current charger. Ppl buy it for emergency use. Even my car have USB port i can use to charge.

Or any computer or any cybercafe in case of emergency.

After one day and half with 1 hour of movie, 30 minutes of games and normal call/in, only 1 bar is down!   This V20 surely consume less battery.

maybe u can reduce your screen brightness and try

yes. Try search in v7 and u will get the answer
just my opinion, i think that skool sp is not a good sp for our tube since we always touch/scratch the screen. It wont last long enough for few months.
get a better one from oversea if possible. For answering your question, use a wet cloth to wipe through the sp should be enough. No need to tear out and wash it 
on the other hand, i feel pity for ts since so many ppl not satisfying his job/manner. He pressure d  .. haha, give our ts some time, hopefully make the dicussion here a better one.
He did spent lots of time, just more patient is needed when answering question.

and duno y, i see many old members who used to be active from v1-v7 didnt appear in v8, 

and btw. Happy Valentine to all