Berkeley CSUA MOTD:Entry 36420
Berkeley CSUA MOTD
 
WIKI | FAQ | Tech FAQ
http://csua.com/feed/
2025/04/03 [General] UID:1000 Activity:popular
4/3     

2005/2/25-27 [Science/Battery, Computer/HW/Laptop] UID:36420 Activity:nil
2/25    Stupid question, how is the 2300mah on my AA battery different
        from the 4500mah on my laptop battery? Is it the voltage? If I
        take 2 of my AA NiMH battery and add it up, the capacity is
        larger than my laptop battery's rated mah....
        \_ mAh is basically how much charge is available at a rated voltage.
           Total energy stored is maH*Volts.  Since your AA batery is 1.5V and
           the laptop's is around 15, the laptop's battery has about 20 times
           as much energy as an AA battery.  You could approximate a laptop
           battery with 2 columns of 10 AA batteries in series. (DO NOT attempt
           this)
           \_ what will happen?
              \_ Laptop batteries have 3 or 4 pins to allow them to monitor
                 and control charging.  Leaving these pins free is not in the
                 laptop design.  Also, laptop batteries are not exactly 15V,
                 some are 13.2 and others are 18.6 or whatever.  Getting it
                 wrong could let out all the smoke in your circuits.
                 \_ Feed the columns of AA batteries to the inlet for the AC
                    adaptor.
                    \_ OK, if you got the voltage and polarity right that
                       would work. -pp
2025/04/03 [General] UID:1000 Activity:popular
4/3     

You may also be interested in these entries...
2009/1/7-12 [Science/Battery, Computer/SW/OS/OsX] UID:52329 Activity:low
1/7     new macbook 17" THE BIG ONE not the portable, has a non removable
        8 hour battery.  Dicuss.
        \_ it's like the airbook
           \_ no it's not, it's giant and i'm not going to carry that thing
        \_ stupid idea, will alienate customers.
         \_ Who will it alienate?  Assuming they can get longer battery
	...
2008/8/29-9/3 [Science/Battery] UID:50997 Activity:nil
8/29    I have 2 AA rechargeable batteries. One is at 300mAH and the other
        one is at 600mAH. They used to be 2400mAH. Is there anything useful
        I can use them for?
        \_ How do you know this?
           \_ http://www.amazon.com/Crosse-Technology-BC-900-AlphaPower-Battery/dp/B00077AA5Q/ref=pd_bbs_sr_1?ie=UTF8&s=electronics&qid=1220035985&sr=8-1
           \_ http://www.amazon.com/Crosse-Technology-BC-900-AlphaPower-Battery/dp/B00077AA5Q
	...
2013/8/16-10/28 [Computer/HW/Laptop] UID:54728 Activity:nil
8/16    I just left my employer. They didn't ask to get their HW back.
        Is is common for employers to contact me a few months/years later
        and ask for their HW back?
        \_ Is it an iPhone 9 prototype? :-)
           \_ as a matter of fact, it is just a 2 year old laptop
              and they don't seem to keep track of inventor
	...
2013/7/8-8/23 [Computer/HW/Laptop] UID:54706 Activity:nil
7/8     Suppose I just stopped going to work and stopped communicating
        with them. How many days will it take before they stop sending me
        paycheck (and maybe even try to get back the laptop they gave me)?
        \_ They'll probably try to call your emergency contact first to see if
           you're hit a tree or something.
           you've hit a tree or something.
	...
2011/12/21-2012/2/6 [Computer/HW/Laptop, Computer/SW/Editors/Emacs] UID:54269 Activity:nil
12/21   In Emacs, how do I make it so that it will resize its screen
        when the maximum resolution of my monitor changes? When I
        use my laptop, my emacs is too big (and I can't resize it
        because the bottom-right corner is not accessible).
        \_ Which OS?  Can't you drag the top border (not a corner) to resize
           the height to be smaller?
	...
2011/5/9-7/13 [Computer/Companies/Apple, Computer/SW/OS/OsX] UID:54106 Activity:nil
5/4     Any thoughts about apple switching to ARM for all machines?
        \_ Could only have happened if the Mac App Store had been a wild, wild
           success, and they were willing to give up Steam. Games/dual-booting
           is strategically valuable to not driving people away from macs.
           A new ARM iOS based device, or opening the Apple TV to iOS apps
           (same thing, really) would be much more likely than sabotaging their
	...
2011/3/12-4/20 [Consumer/CellPhone, Computer/HW/Laptop] UID:54057 Activity:nil
3/12    I am curious what others think of tablets like iPad. They don't seem
        useful to me, but I use my computer for more than web browsing,
        Facebook, and Twitter. Why would I buy one instead of a laptop?
        They seem like a disabled laptop to me, but at a higher price.
        \_ You are most likely a coder.  iPad is not for coders.  They are
           what you get your non-technical friends.  Or musicians.  Look at
	...
2010/8/23-9/7 [Computer/SW/OS/Windows] UID:53932 Activity:low
9/21    are you guys really all using win7 in some way now?
        \_ Yes.  In my company, we have upgraded all our machines for
           development, QA and other office use (HR, Finance, Receptions, etc.)
           from WinXP to Win7 a few months ago.  Our products now primarily
           support Win7/Win2008 and secondarily support WinXP/Win2003.
           \_ Any weird gotchas support-wise?
	...
2010/5/17-26 [Computer/SW/OS/OsX] UID:53835 Activity:nil
5/13    I am getting a new Macbook Pro. Should I get a glossy or matte screen?
        I always had matte in the past. I use my laptop just about everywhere
        and glare is a concern. Should I stick with matte? I noticed
        glossy is the default now.
        \_ It is weird, but I have the glossy screen that goes to the edge of
           the monitor for my 13" PB and it somehow seems bigger than the one
	...
2010/4/5-15 [Computer/HW/Laptop, Computer/SW/OS/OsX] UID:53770 Activity:nil
4/4     My macbook is dying. After three and a half years, I want to retire it,
        and get a new one, but I live in constant fear* that Apple will pull a fast
        one on me and update them as soon as I do. Anyone know anything about an
        impending Apple laptop refresh?
        * = hyperbole
        \_ http://buyersguide.macrumors.com
	...
2010/1/22-30 [Computer/HW/Laptop, Computer/SW/OS/OsX] UID:53655 Activity:high
1/22    looking to buy a new development laptop
        needs ssdrive, >6 hr possible batt life, and runs linux reasonably
        Anyone have a recommendation? Thx.
        \_ thinkpad t23 w ssdrive and battery inplace of drive bay
        \_ Ever wondered what RICHARD STALLMAN uses for a laptop?  Well,
           wonder no more!
	...
2009/10/24-11/3 [Computer/HW/Laptop] UID:53466 Activity:kinda low
10/24   How well do you see color? I got 8, how about you?
        http://www.xrite.com/custom_page.aspx?PageID=77
        \_ 7
           \_ what monitor did you use?
              \_ LCD on thinkpad x32, under not so great lighting conditions.
        \_ I scored 101, which seems impossible. Then again, I didn't
	...