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Specification
Brand : QWinOut
BulletPoint1 : Can avoid the risk of burning the mosfet or the 5v regulator at the moment of power on
BulletPoint2 : With this Capacitor , we can use 3S 300~350mah battery for the Crazybee F4 PRO V2.0 and Crazybee F4 PRO V2.1 , and 2s 300~350mah battery for the Crazybee F4 PRO V1.0
BulletPoint3 : And if you want to use the battery above 350mah , we recommend use 220 uF or above capacitor.
BulletPoint4 : F57Z*18A927*A
BulletPoint5 : FORD F57Z-18A927-A
Capacitance : 100 microfarad
Color : Regular
Edition : 1 pcs
EquivalentSeriesResistance : 0.05 ohm
ExternallyAssignedProductIdentifier1 : 843492119276
ExternallyAssignedProductIdentifier2 : 0843492119276
ItemName : QWINOUT XT30 Plug Pigtail Power Wire 100?F Capacitor for Mobula7 HD Sailfly-X TRASHCAN UR85 UR85HD Crazybee F3 / F4 PRO Parts (1 pcs)
ItemPackageDimensions_Height : 13.2 centimeters
ItemPackageDimensions_Length : 2.1 centimeters
ItemPackageDimensions_Width : 9.3 centimeters
ItemPackageQuantity : 1
ItemShape : Rectangular
ItemTypeKeyword : vehicle-amplifier-capacitors
Manufacturer : QWINOUT
Material1 : Plastic
Material2 : Aluminum
MaximumVoltage : 19 volts
ModelName : Ranger
ModelNumber : M30631
MountingType : Pole Mount
OperatingVoltage : 19 volts
PartNumber : M30631
ProductDescription : Brand: QWINOUT
Wire length: 70mm(include xt30)
Height: 2.6gram
Used for :  Crazybee F3 / F4 PRO series flight controller

Can avoid the risk of burning the mosfet or the 5v regulator at the moment of power on

With this Capacitor , we can use 3S 300~350mah battery for the Crazybee F4 PRO V2.0 and Crazybee F4 PRO V2.1 , and 2s 300~350mah battery for the Crazybee F4 PRO V1.0 

And if you want to use the battery above 350mah , we recommend use 220 uF or above capacitor.

We found most of the 5v regulator and esc of the Crazybee F4 flight controller burnt after mod the PH2.0 to XT30 .

Also, more powerful the battery is(lower esr than stock battery) , more possibility to fail. And, the temporary solution is add a low esr capacitor onto xt30 connector. This capacitor should have a esr less than 0.2 ohm and have a capacitance more than 100uF. Rubycon ZLG/ZLH series and Samyoung NXB series are what we have tested and recommended.

Plese refer to our pics:
Our pictures show what happened after plug in battery

The max voltage is 19v and the voltage spike lasted for about 5us.After add a 100uF/16v (NXB16VB100M5*11_LO) capacitor, we obtained a much slower and smaller spike: 

Without 100uF, the max spike voltage increase to ~25v while with 100uF it decrease to about 20v, which is acceptable to Crazybee F4 PRO V2.0 and Crazybee F4 PRO V2.1 
ProductSiteLaunchDate : 2019-10-29T06:17:16.060Z
Size : Small
SupplierDeclaredDgHzRegulation : not_applicable
UnspscCode : 32121500