Used one of these to replace the battery in my HiTech Optic 6. Use to get maybe 40 good mins with the standard battery before it got "Iffy" after a few years use. Fit right into the back of the transmitter. Same weight - had to change the connector though (Simply clipped the old one off the old battery and soldered it on). This battery will go one hour and still show fully charged, three hours and still the low voltage alarm will not go off. Have been charging with the std wall charger even though it takes 3-4 days (It lasts a month of flying as it doesn't seem to discharge when sitting). Haven't tried fast charging yet. Simply excellent. (Posted on 9/28/12)
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