Even een berichtje van een "biased source"
De nieuwste generatie MFIS 3 cells zijn prima en de kracht is meer dan een thunderpower. Ze hebben meer de "punch" als de nieuwste flightpower cells (evo 20c). Dit heb je nodig voor de 450TH of 450F. Hij is heel "power hungry" en gebruikt veel amps. De enige ding is de kosten voor de MFIS packs zijn minder omdat ze zijn special gemaakt voor ons in China. je hebt geen kosten van de "middle men". Ze zijn direct van het fabriek naar ons.
Maar je vraag was ook hoeveel "C" je hebt nodig voor de 450TH en ik moet zeggen dat je moet niet minder dan 15C 1800 of meer MAH packs gebruiken als je wil je Lipos gebruiken voor een langere tijd. Mindere "C" rating zullen ook werken maar niet met hetzelfde kracht en zeker niet voor heel lang.
Ik vlieg zelf met thunder power, mfis, en flightpower (omdat ik moet alles proberen) en ik vind dat de MFIS en Flightpower de meeste kracht heeft en de thunderpower minder kracht maar de langste tijd. Nu vlieg ik eerst met de MFIS packs en wanneer deze leeg zijn dan met de anderen. Maar ik vlieg een beetje aggressief en vind veel kracht leuk
Even een beetje meer uitleggen maar in engels omdat het makkelijker is om me dit uit te leggen in engels.
If you have heard any bad stories from the Version 1 MFIS packs this is why.
Both versions of the MFIS packs have very low internal resistance which means that they deliver ALOT of current when its needed (higher C ratings) and they also hold their voltage VERY well ALL THE WAY to the END of the pack's capacity. This is where the problem starts. The voltage dips VERY quickly at the end of the packs charge on all cells and sometimes this results in the cells being out of balance with eachother. This is not in and of itself a problem. None of these issues are. The problem comes on the next charge and discharge cycles after this one if you dont balance the pack. The version one packs had no balancing connectors so the only way to deal with this issue is as follows:
DONT DISCHARGE THE BATTERY TO THE END OF ITS CAPACITY!

The voltage imbalance occurs ONLY when you over discharge it. The safest way to be sure you arent creating imbalanced cell conditions is to fly only 80-90 percent of the pack and then recharge it. This translates to timing your flights and keeping them under 8 minutes on the Version 1 packs. DONT FLY THEM UNTIL YOUR ESC BEGINS low voltage cutoff. Do this only once and time how long it takes and then from then fly about 1 minute less than that and you should be fine. Alternatively you can also install your own balance taps / leads and balance after each flight.
For the Version 2 packs the same rules apply. The only difference is that now we have installed balancing leads which allows you to check and balance the pack and this will easily allow you to keep the pack in balance and extend the number of cycles you will get from it.
All packs are pre-balanced at the factory to .01 volts so following these simple guidelines will greatly increase the life of the pack and the number of cycles you will get from it. The cells are matched and pre-balanced you just need to make sure they stay that way

The secret to the extra power behind these packs is simply that they are engineered to maintain their voltage EXTREMELY well under heavy load so your motor RPM does not drop during power hungry maneuvers. However this design introduces the problems explained above and by simply following the guidelines for these packs you will be happy with their performance.
Also a good general guideling for lipos is this. After you use a lipo its resting voltage should always be the same as its nominal voltage or you have over-discharged it and if you continously do this it will shorten the number of cycles you will get from the pack. In other words, after a flight, your 3 cell lipo pack should be at 11.1 volts resting voltage (5-10 minutes after the flight is the resting voltage). If its lower, Shorten your flight next time by 30 seconds or so and measure again after that flight.
Hope this HUGE POST is helpful to some of you
