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BeavenX5 -> A123 4s battery in my T-Rex (4/19/2008 5:09:03 PM)
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Well, as promised, I buit some 4S A123 batteries for my P-38 and tried them on the T-Rex. I am new at flying helis with only about 20 flights on my T-Rex 450SE v2. I am still only hoovering and doing small circuits. I crashed Monday practicing my first nose in hovering... Obviously I am not doing any 3D yet.
- At 13.2v they give the T-Rex a very good head speed.
- You can get easily 10 minutes flight with this battey. Takes only 15 minutes to charge it back to full charge so you can fly all day with only 2 batteries.
- They are quite heavy at 345grams. The extra weigh did not matter for my flying. It migh even help with stability.
- They are quite bulky so I needed to build them in two packs of 2cells. One goes at the normal location, the second goes under the belly between the skids. You need to do this in order to keep the center of gravity where it shoould be.
Overall, I think A123 4S packs are great for sport flying as they are relatively cheap (out of a Dewalt pack), will last for 1000 flights, are extremely safe, can be discharged lower than lipo without consequences and will allow you to fly all day on 2 batteries. The negative side of it is their weight and bulkiness that might not be as good for hard 3D flying. Current draw is not a concern here at they can easily handle constant 30C discharge.
There is a great thread on them at: helifreak here
Here are a few pics of my installation.
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