LongGo - electric flight batteries

LongGo flight batteries consist of high grade KOKAM Lithium Polymer cells. The cells from the world leader distinguish themselves through high load capability and a long lifetime. The cells are assembled to a LongGo flight battery by mechanically protecting them through a special manufacturing procedure. Each flight battery is tested at EMCOTEC using laborious measuring equipment. Only herewith, optimal quality can be achieved.

All LONGOO flight batteries carry a "Special Balancing Connector" - a special plug, which allows for balancing the single cells during charging (see also accessories/chargers respectively e-shop). Here too, EMCOTEC is the leader in technology. Because flight batteries are being heavily used, rebalancing plays a major role. Because of the high currents, the cells carry different voltages after a few flights. Therefore, cells with the highest voltages become overcharged when charging without a balancer. On the long run, this leads to decreasing capacity - the battery gets "worse" and lifetime shrinks. The cell voltages of the LongGo flight batteries are being levelled thanks to the connected balancer during charging. The batteries therefore keep their power even after many flights and they live longer. The LongGo balancer is delivered with different connectors (MPX, JST and DSUB9) and suits all LongGo flight batteries.


In order to test our flight batteries and balancers we developed a special measuring device: the LiPo-Simulator. With this simulation device up to 7 Lithium Polymer cells with up to 1 amp power can be simulated. This means 7 galvanic separated LiPo cells whose voltages (separated from each other) are adjustable from approx. 2.2 volts up to 4.4 volts. A connected balancer can be tested by the simulated cells, i.e. at what voltage the balancer starts to balance. Switching at the pushbutton allows for reading of the current, which is drained by the balancer. Herewith an exact check of the balancing is possible. The LiPo simulator can also be used as a measuring device. In this operating mode it displays the voltages of the single cells of a battery pack. During discharging tests, the cell voltages of all single cells can be monitored. "Bad" cells can be immediately rejected and replaced. The LiPo simulator works totally self-sufficient and is energized by 3 LiPo cells whose voltages are monitored of course (including optical and acoustical error indication). Imminent low voltage causes the LiPo simulator to turn off. The LiPo simulator can be purchased at EMCOTEC.


We also provide the newest KOKAM high current LiPo cells with 4800 milli amp/h. Perfect as F3A battery pack for highest power and "drive". Please see technical data and prices in the e-shop.



Technical Data "LongGo Light" (for 10C and 20C applications) Specification of the C-rate according to manufacturer


For the "LongGo Light" batteries each best "top 5%" cell is selected from production and matched. This provides for a long lifetime and high capacity! Despite their capabilities, the "LongGo Light" batteries are at a more favourable price than comparable NiMH batteries from pushed and matched cells.

New: 12C cells immediately available in e-shop! All LongGo flight batteries starting from 4S are being measured in house using elaborated test equipment. The battery is sent back to the manufacturer and does not reach the market if a cell in a pack differs for more than +/- 1.8%. This way we can guarantee best quality. This test procedure is unique! For a small extra cost, we attach the measuring protocol to the battery. Please see the offer in the e-shop. Here, more battery types are listed!



Technical Data "LongGo" (for 15C and 20C applications) Specification of the C-rate according to manufacturer


These LongGo batteries consist of high current proof 15C respectively 20C cells. They are a little heavier than LongGo Light but can be strained with even more load. There is always a correlation between the weight of a LiPo cell and their load capability: The more it weighs, the more it can be loaded. Extremely light cells with utopistic high currents are technically unrealizable.


Technical Data "EMCOTEC LongGo SBC" (for 15C and 20C applications) Specification of the C-rate according to manufacturer


EMCOTEC LongGo SBC batteries are high grade tailored LiPo batteries which, based on their design also can be used in drones (UAV's). Here, the cells are tailored to powerful battery packs. These cells too, consist of "TOP 5%" charges of the cell manufacturer and are assembled at EMCOTEC very carefully. Measuring equipment for over 10.000.- Euro (e.g. 6.5 kW DC electronic load) provides for realistic data.


Additional information about LongGo electric flight batteries:

  • Use only chargers released by EMCOTEC GmbH
  • Always use a balancing unit for high current applications (such as electric flight)
  • Observe charging current (1C max.) and charging voltage (number of cells)
  • Observe the maximum discharge current
  • Protect against mechanical force (squeezing, push, bend, drill)
  • Do not open or cut the batteries in any case, do not throw in fire, keep away from children
  • Do not short cut the battery in any case
  • Do not discharge batteries below 2.7 volts/cell (under load) otherwise they are definitively damaged! Charge already at 3.0 volts (without load)
  • Do not operate the batteries below -5°C (23 degree Fahrenheit). Capacity decreases dramatically below freezing point!
  • Protect batteries against heat (maximum allowable battery temperature is 65°C / 150 degree F).
  • Before storing (e.g. winter) charge the batteries - don't store when discharged!
  • Do not leave the batteries unattended during charging
  • In case of fire with LiPo batteries involved (e.g. crashed burning jet), NEVER extinguish using water, but use powder extinguisher instead!


Considerations about the C-rate according to manufacturer specifications:

  • The manufacturer’s specifications in respect to the maximum current load capability of cells (C-rate) are not realistic (e.g. 10C or 20C). This is usually not dramatically, because such high (continuous)-currents are not really needed. However, consider the minimal flight duration. If a model with electric drive should fly for 8 minutes, the average current load is 60 minutes / 8 minutes = 7.5C. Since LiPo batteries should only be discharged to approximately 80%, the current load averages to approximately 30 amps for a 5 amps/h battery. For such a "continuous"-current-load a 15C battery sis sufficient (according to manufacturer specification).
  • Because one talks about 12 - 15 minutes flight time, the C-rate amounts for only 4C - 5C. A 10C battery (according to manufacturer specification) suffices for that reason.
  • Only for F5B or F5D, where electric motors run under e.g. 5 minutes, cells of extremly high C-rates are necessary. Here, only 20C KOKAM cells are applicable (3200 milliamps/h or even better 4800 milliamps/h).

Due to the high energy density (up to 190Wh/kg), the cells are not harmless and require special care! EMCOTEC GmbH shall therefore assume absolutely no liability for damages that arise from incorrect handling of the lithium polymer cells.
   
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