The E-power 4500 cells are awesome. They have all the high performance characteristics of the EP4200 (very high AV and very low IR) but they do not have the hard self discharge that was the issue with the EP cells. All this and a little extra runtime!
I would definatley give them a try. Customer service is great as well!
TLR/Losi Team Driver
TLR/Losi | Tekin | Venom | DE Racing | Spektrum | Exotek | JBRL | Kolor Koncepts | OC/RC |Sticky Kicks | Imagine It Graphics | Casper-RC.com
TLR 22 3.0, TLR 22SCT 2.0, TLR 22-4 2.0, TLR Ten-SCTE 3.0, Spektrum DX6R
WWW.CASPER-RC.COM TLR and Tekin setups