This is what I have to work with


Any suggestions?
Edit:
Compiling links to compare
http://www.gensaceusa.com/98p-60c-4200-2s2p-hardcase-shorty.html
http://www.amainhobbies.com/rc-cars-trucks/protek-rc-2s-supreme-power-li-poly-100c-hard-case-shorty-battery-pack-w-5mm-7.4v-4250mah-ptk-5102-15/p423775
http://www.amainhobbies.com/rc-cars-trucks/team-trinity-hi-capacity-shorty-2s-li-poly-100c-hardcase-battery-w-5mm-bullets-7.4v-5000mah-tritep2304/p441810?gclid=CKeSyuO9nskCFZMvgQodPUwIOA