Battery rc

Database of batteries

 * http://www.ecalc.ch/ RC Calculator, motor databases. Select appropriate motor size etc. for load.
 * http://www.rcdetails.info/ Database of motors, batteries from various manufacturers.

coin
https://www.youtube.com/watch?v=ZtDn6eH3rlQ cr2450 recharge using tp4056 charging module replace resistor with 33k(IN- side). https://www.thingiverse.com/thing:1808964. Or use Coin Cell Battery Breakout - CR2032 module. From https://hackaday.com/2014/01/17/1-coin-cell-charger/

New battery tech
http://diydrones.com/profiles/blogs/ncr18650b-the-future-of-rc-aircraft-batteries

http://store.mygeekshow.com/product-p/3.3a-4s-2c-battery.htm

lll
http://www.societyofrobots.com/batteries.shtml

http://www.batterystuff.com/kb/articles/battery-articles/proper-care-and-feeding-of-a-nimh-battery.html

http://www.ladyada.net/learn/lipoly/

http://en.wikipedia.org/wiki/Lithium_polymer

li ion have higher power density then li polymer. lipoly are used for high surge current 30amps, not laptops.

http://www.rcgroups.com/forums/showpost.php?p=3066606&postcount=8 link to links

http://www.rcgroups.com/forums/showthread.php?t=209187

http://www.rcgroups.com/forums/showpost.php?p=9742263&postcount=11 pdf on electric flight

http://www.wattflyer.com/forums/showthread.php?t=31071

http://www.cheapbatterypacks.com/Models/Loose-Cells/23/Nimh-Cells.aspx

http://www.rcgroups.com/forums/showthread.php?t=599287 balance bat

http://www.hobby-lobby.com/brushless_motors_269_ctg.htm

http://www.rcgroups.com/forums/showthread.php?t=170524&highlight=Parallel parallal charging

http://www.rchelicopterfun.com/rc-lipo-batteries.html

http://www.rcdiscuss.com/showthread.php?42892-When-to-stop-flying-because-the-LiPo-battery-is-low

Low voltage
http://www.dynamiterc.com/Products/Default.aspx?ProdID=DYN4070

http://www.hobbyking.com/hobbyking/store/__4176__HXT_Lipo_Monitor_4S_A_must_have_for_all_lipo_users_.html monitor cells 

http://www.hobbyking.com/hobbyking/store/__7225__Hobby_King_Battery_Monitor_4S.html buzzer below 12v

Links
RcServos

RcHobby