FlightPower EVO 1800

Here i have tested the new Flightpower EVO20 1800 Lipo batterys, there have been some talking of these new packs over the internet forums, some say they are the best there is, some saying they have bad quality/performance and not genuine 20/30c cells.

The battery is put togheter real nice, with high quality, cells are perfectly matched and balanced, also all of these packs are equiped with balancing connectors, this means one can easely balance and monitor the cells with Lipo balancers like the Robbe EQlizer or FlightPowers own balancing system, this will keep the performance of the battery during it´s lifespan and helps the battery to last many sycels. Battery is delivered with safety information and handling precations. Building of the pack are very well done!

The EVO packs seems to be carfully put togheter with perfect balancing and matching of the cells.

Can this battery realy handle 20c cont and 30c burst current? this is what i have tested and messured, and yes this is truly a 20/30c Lipo battery. Tests have been done to register tha capacity of the pack, when discharging the pack i mostly drained betwen 1700-1800mAh depending on discharge load, cells where discharge down to 3v/-2,9v/cell. Continius discharge of 20c ( 36Amp) has been done, this is the absolute max continuos C rate of this pack, the pack when it´s cold (room temprature) dropps down to 8,7-8,7v, when the battery have gained in temp the voltage increase, and after a while up to 9,26v. After draining the batterys full sycle whit 20c continuos dischare the battery temp was 57 degrees Celsius, hot but not to hot, when testing this the battery had no air flow or forced cooling, in a plane or heli setup there will be some kind of air flow over the cells and the battery should remain cooler. But i dont think its healty for the cells to be puched harder, i would try to keep it in maximum of about 16c continuos discharge for long life sycle and low temp during flight in summer time.

30c burst testing 2-3sec, this battery can handle 30c (54Amp peak) tests have shown that when pushing it to 50Amp the pack holds 9,3v (3,1v/cell) withaout any danger in heat. More tests will be done with loads up to 54-55Amp, my guess is it will hold abaout 3v/cell during this load. I think the best maximum load for this pack would be 22-25c peak, this for long life span and low temp during flight. On 8c (14,5Amp) discharge the pack hold 10,5v, this gives good performance on smal helis like the Zoom or T-rex, also smal size planes like the mini Funtana, Katana and JumpingJack will really get nice performance with this battery, setups for 12-15Amp cont and burst up to 30Amp this battery will have high voltage during load with high efficiency and stay cool.

EVO 1800 3s, 18A discharge

To the left you can see graps of 18A continuos (10c) discharge of the EVO 1800 3s charge. Also temprature data was registered during the test, result can be faound below, total discharge capacity was 1710mAh.

EVO 1800 3s 18A discharge

EVO 1800 3s 1,5Amp charge, 1728mAh

When charging after a full discharge, the capacity is mostly between 1750-1800mAh, see data to the left.

www.rcsports.se

www.flightpower.co.uk

Text: Joacim Göransson 2006

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