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Lithium Polymer Batteries
Lithium polymer (LiPoly) batteries offer the most energy storage per weight, about four times better than NiCd, making them ideal for RC ornithopters. They hold their charge a long time and have no memory effect. Voltage is 3.7 volts per cell. Charge only as directed.


    
LiPoly 2-cell, 450 mAh - $18.95
Two-cell (7.4 volts) lithium-polymer battery with JST output connector and cell-balance charging connector. Capacity is 450 mAh. Weight is 0.9 oz (26 grams). Blue Arrow Power.

 

 
Ultra Connectors - $2.49/pair
Heavy duty, low-loss battery connectors with solder tabs. Male/Female pair. Order a bunch!

 
JST Connectors - $1.99/pair
Lightweight connector with leads. Now sold as a male/female pair for the same unbeatable price! Battery is male, charger is female. You get both connectors for just $1.99!
    Warning: Incorrect charging or other misuse of lithium polymer batteries may result in explosion or fire. Use only chargers designed for lithium polymer batteries. Read and observe all instructions provided with your battery and charger. Do not charge unattended. Batteries may be damaged if discharged below 3 volts per cell or faster than the recommended discharge rate.