ProTek RC PTK-5187 LiFe Futaba, JR, Spektrum, KO, Transmitter Battery 9.9V 2100mAh

This is the ProTek R/C LiFe Transmitter Battery Pack and is intended  for use with Futaba, JR, Spektrum and KO Propo Transmitters that use a  4x4 AA Battery Tray. Lithium battery technology is evolving. With cell  dimensions that fit anywhere a standard Li-Poly battery will and rapidly  increasing capacity, LiFe chemistry will soon set the standard that all  others are judged by. With the ability to deliver 1000+ usable cycles,  and a life span up to 4 times longer than Li-Poly batteries (when cycled  under the same discharge conditions), these batteries offer the user an  excellent balance of performance and value. LiFe batteries are more  durable than Li-Poly and are able to handle a higher level of abuse when  compared to Li-Poly without the risk of pre-mature failure. Unlike  Li-Poly, LiFe cells can be stored in a fully charged state with little  to no loss in stored power, and can be discharged deeper with less risk  of damage to the cells. Most importantly, LiFe batteries are SAF