Current wants to go up
squared with voltage (keeping everything else the same). So, going from 2 to 3 cells will give an increase in current by factor 2.2! 120% more.
And for a rainy day ...
* Get a current/Watt-meter, it will save you money and will more than pay for itself!
3$ diy Watt-meter:
http://www.rcgroups.com/forums/showthread.php?t=949923
* Presentation: de-mystifying Electric Flight
http://www.rcaircrafters.org/The%20Electric%20Show.pdf
Get a current/Watt-meter 
*
http://www.ampaviators.com
-> Beginner Guide
Get a current/Watt-meter
* E-book: Everything You Wanted To Know About Electric Powered Flight
http://homepage.mac.com/kmyersefo/ev...ng-e-power.pdf
Corresponding discussion:
http://www.wattflyer.com/forums/showthread.php?t=31071
Get a current/Watt-meter
* Several Wiki's
http://www.wattflyer.com/forums/vbglossar.php
Get a current/Watt-meter
* Battery FAQs
http://www.hangtimes.com/redsbatteryclinic.html
http://www.batteryuniversity.com/
Get a current/Watt-meter
*
http://www.ezonemag.com
-> Faq
Get a current/Watt-meter
* System wiring diagrams:
http://scriptasylum.com/rc_speed/_wiring.html
* LiPo pack and balancer cable wiring:
http://scriptasylum.com/rc_speed/_lipo.html
Get a current/Watt-meter
* Monthly Ampeer newsletter, on paper and online available. Excellent articles in the archives by e-flight pioneers Ken Meyers and Keith Shaw a.o.
http://homepage.mac.com/kmyersefo
Get a current/Watt-meter
* Brushless motor animations and simulations. Mostly outrunners but inrunners are just outrunners turned inside out, nothing fancy:
http://www.rcgroups.com/forums/showthread.php?t=216928
Get a current/Watt-meter
* Choosing a power setup
http://www.rcgroups.com/forums/showthread.php?t=739069
http://www.wattflyer.com/forums/showthread.php?t=27019
Get a current/Watt-meter
* About de-rating controllers and motors, starting at 'for everyone else':
http://www.rcgroups.com/forums/showt...0#post11476940
Get a current/Watt-meter
* E-flight calculators, a compilation
http://www.rcgroups.com/forums/showthread.php?t=606703
Get a current/Watt-meter
* Current, voltage, Watt, battery-types and -C-rating explained
http://www.rcgroups.com/forums/showthread.php?t=417868
Get a current/Watt-meter
* About BECs, #servos and battery voltage:
http://www.rcgroups.com/forums/showt...2#post11679182
Get a current/Watt-meter
* 'Dry' testing brushless motors after a mishap:
http://www.wattflyer.com/forums/showthread.php?t=35216
http://www.rcgroups.com/forums/showthread.php?t=240993
Get a current/Watt-meter
* How to repair a brushless motor
http://www.rcgroups.com/forums/showthread.php?t=1079423
Get a current/Watt-meter
* Motor_rewinding_101, about poles, winds, delta, star
http://www.gobrushless.com
-> knowledge base
-> basic overview (1-5)
* And I almost forgot, get a current/Watt-meter
ps: "Get a current/Watt-meter
" copyright
Cato Maior, 234-149BC
Vriendelijke groeten
Ron