the battery you wish to use for your quad-copter has nothing to do with which flight controller you have unless you want to use the voltage monitor. In the case of the KK2.1 nobody seems to know the exact maximum voltage it will take, but you should be fine up to 4S (14,8 Volt) for sure.
You can calculate the maximum amount of Amps a battery can supply by multiplying the number of Amp Hours of capacity with the C Rating : for this battery 2,2 * 25 = 55 Amps. With your setup of 4 * 20 Amp motors you would need a battery that can supply at least 80 Amps. I would recommend looking into a battery with a higher C Rating, if you still want to use a 2,2 Ah Lipo you need a C Rating of at least 35-40.
As far as flight times go, there are A LOT of variables here so there is no way of accurately predicting how long it will stay in the air on one battery. But remember that higher voltages (4S etc.) and big props (11" and so on) will be more efficient.
Quick answer: Yes, it's possible. How long will the flight time be? Depends on a lot of things ranging from the all-up weight to the electronics you have on there to the humidity, climate and how far above sea level you are.
hi alex, Ive seen Registered airmail but it cost me $40 for maximum of 2kg. Fedex is much cheaper that is why I tried it. but if that is the case that i will be paying 1.5-2k for my package when it is arrived in PH then maybe it is much better to go for Registered Airmail.
I see what you mean. I tried loading 7 lipos at check out and it only gives the two options. You can try registered airmail but it takes 2 to three weeks longer than FedEx. Not only that, once it gets to the post office, there's a good chance the customs guy might still charge you a minimum of 1K. Why? Because the package will contain several counts of the same item. They will automatically assume that you will re-sell them locally and will charge you documentary fees, processing fees, declared value tax and VAT. When I want 3 or more of the same item (like LiPos and motors, and ESCs), I break them up into multiple orders and add low value items so they will believe that I'm ordering only for personal use (which I actually do).
alex, how to reply your link? di ako makareply.
anyway, ganun ba? kung 7 ang binili ko mga ilan kaya ang babayaran ko? Sisingilin kaparin ng fedex kahit nagbayad kana ng $24 sa shiiping? wala kasi akong makita na registered mail. Fedex ang pinkamura.
7 pieces ng Lipo? Dami nyan ah! Sisingilin ka pa rin ng FedEx ng storage fee, processing fee saka tax. On top of the $24 (shipping fee lang yun). May posibilidad na lumusot yung tax pero rare mangyari sa FedEx yun. Yung tax, depende sa declared value. Tancha ko (estimate lang ha) sisingilin ka ng 1.5-2K ng FedEx.
Yung first order ginamit ko FedEx kasi maraming kasabay. Within 5 days nasa bahay na kaso siningil ako ng FedEx ng tax saka fees totaling 1.3K. Lugi, pre. Yung susunod na order ko registered mail with Lipo na lang. $7 shipping fee ng hobbyking tas pag dating dito, nag padala ng notice yung post office na pick-upin ko sa kanila yung parcel. Siningil lang ako ng 50 pesos.
Ordered 5 battery's, and only one failed after about the second use. 1/4 the price of others, and 4/5 of them are still plunging away and have massive power punch. I have nothing really bad to say, great deals.
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7 thumbs up!
Sono perfette per t-rex 450 ,volo benissimo senza aver speso un capitale
1 comment. Reply..
7 thumbs up!
Mine puffed after 20 flights :(. But I ordered them right after they came out so it might have been caused by some bad first peaces. Btw I charge to 4,1V and discharge to 3,73V per cell so It wasn't my fault. Now they have 40 flights and are slowly more puffing but they can still deliver enough power for my HK-450. We will see how much more they can take.