rc batteries mah
Electric flight – the best and worst of Li-Po
What happened to that mosquito snarl that always seemed to accompany the sight of model airplanes? The answer is they’re going electric and silent. Li-Po (Lithium Polymer or Li-Poly) batteries are rapidly becoming the standard power source for electric model airplanes. Li-Po batteries are smaller, lighter and hold more power than their predecessors (Nickel Cadmium and Nickel Metal Hydride). There are three specifications that need to be taken into consideration when making a Li-Po battery purchase for your electric model airplane.
The voltage of the battery will tell you how powerful it is, the amperage rating will give you an idea how long it will last, and the burst/constant power rating will tell you how quickly the power will discharge. A major difference between Li-Po batteries and others available for RC model airplane use is that it is much easier to mistreat the battery thereby creating unsafe situations the consequences oc which can be dramatic. Li-Po batteries can be very dangerous if you don’t follow all of the safe handling procedures set out by the battery manufacturers.
In most cases, Li-Pos used for model airplanes come in two voltage ratings ratings; 11.1v and 7.4v. The rating dictates how many volts the battery will discharge to your brushless RC motor. Electric RC model aircraft motors themselves have ratings that relate to this voltage discharge specification. The voltage of a Li-Po battery is directly tied to the RPM output of a brushless motor in that a motor rated for 1000kvm will rotate 1000 times per minute for every volt it receives from the battery. In other words, a 1000kvm motor is capable of 7400 RPM when using a 7.4v Li-Po, and 11,100 RPM when using an 11.1v Li-Po. This information, combined with the prop type and weight of the plane gives you all the data needed to calculate the final thrust output of a given motor.
The amperage rating of Li-Po batteries is rated in milliamp hours (mAh). This technical term describes how long the Li-Po will provide electrical power in much the same way that the size of the fuel tank on a glow powered airplane will dictate how long the engine can keep running. Typical electric RC model airplane flights can last 20%-50% longer when using Li-Po compared to other batteries. The larger the mAh rating, the bigger and heavier the battery will be. This is a major factor to take into consideration when putting together any electric RC model aircraft.
Li-Po battery burst rates describe the output characteristics of the battery. Burst rates tell you how much power the battery is safely capable of discharging in one big burst. This number is often higher than the constant power rating. Once the burst of energy has been discharged, the constant power rating tells you where the power output will settle down to.
Li-Pos come with very strict safety guidelines that tell you how to care for them. Charging rates, charging times, and damaged battery disposal procedures just to name a few. Damage to your RC electric model airplane can be avoided by following these guidelines. Properly matched brushless motors and Li-Po batteries can provide hours of clean and quiet flying enjoyment. Take the time to understand everything that’s involved with a Li-Po setup and you will have more fun and more time in the sky with your electric model airplane.
About the Author
Bruce Bird makes it easy for the beginner to quickly get a grasp of the broad range of exciting activities that make up airplane modeling. To receive his free 5 part mini-series visit http://www.modelairplanesecrets.com.
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6V Vacuum cleaner battery for RC3000 2000mAh Power Tool $51.00 Power tools battery For KARCHER 6V NI-MH 2000mAh.. Compatible part numbers : 2.891-029.0. Compatible tool models : Include: Power Tools Battery x1… |
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30 Pure nickel Solder Tabs for high capacity LiPo, NiCd and NiMh Battery Packs $6.99 30 pcs 2 inch 0.007 thick commercial grade pure nickel solder tabs for RC Toys and Power tool battery pack DYI projects. Best suited for heavy duty / high current draw applications using high capacity NiMh, NiCd, LiPo battery packs…. |
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3.6V 800mAh Ni-CD Cordless Battery For Uniden ANA9710, BBTY0373001, BBTY0414001, BBTY0494001, BP2499, BP990, BT2499, BT990, EXP990, EXR2460, EXR2480, EXS9110, EXS9110i, EXS9500, EXS9600, EXS9650, EXS9660, EXS9800 , BP-2499, BP-990, BT-2499, BT-990, EXP-99 $7.09 3.6V 800mAh Ni-CD Cordless Battery For Uniden ANA9710, BBTY0373001, BBTY0414001, BBTY0494001, BP2499, BP990, BT2499, BT990, EXP990, EXR2460, EXR2480, EXS9110, EXS9110i, EXS9500, EXS9600, EXS9650, EXS9660, EXS9800 , BP-2499, BP-990, BT-2499, BT-990, EXP-99… |
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Bastens LiPo battery upgrade for the Parrot AR.Drone- a high capacity alternative replacement battery – 15 to 20 minute flight time - $39.95 Looking for more flight time than a LiPo battery upgrade is the way to go. With this high capacity battery you will get 15 to 20 minute flight time! This battery not only higher capacity but it does so with no weight gain. By getting rid of the heavy hard case that the original stock battery has and substituting it with a tough plastic shrink wrap case. Remember you can charge this battery with th… |
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Syma S107 / S107G Upgrade 3.7V Lithium Polymer 240 mah Battery for Remote Control Helicopter Helizone RC Firebird $2.25 Replacement & Upgrade battery for the popular Syma S107 and Syma S107G helicopter. Battery provides longer flight time by up to 3 to 6 minutes. Capacity at 240 mah compared to the standard 150 mah, 33% more capacity! Battery Replacement Instructions: |
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TSD Universal Smart Charger 7.2-12V for NiCad & NiMH batteries $19.99 Light Indicator when Charging • Large & Small Tamiya Adaptor• Auto Trickle Charge Function • The smart charger will cut-off power automatically when battery is full• Charging style will Re-energize some Dead NiMH Packs• Input: 100-240V, 50/60Hz 700 mA Max •Output: 20V 09A/1.8A •7.2v – 12v Selector Switch•Two output levels .9A and 1.8A. For battery packs 11… |
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Tenergy Universal Smart Charger for NiMH/NiCd Battery Packs (6V – 12V) Perfect for RC or Airsoft Battery Packs — NEW! $19.99 Smart charger For use with 6V-12V NiMH & NiCd battery packs Temperature sensor Charging light indicator Large & small Tamiya adaptor Auto trickle charge function 100V-240V input 20V output 4-hour safety timer 1.0A & 2.0A current levels Selectable output switch 1.5×2.36×4.67 0.6lbs Enjoy extended airsoft skirmish play? This universal smart charger by Tenergy will charge your airsoft gun so you’ll … |
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11.10V,4400mAh,Li-ion,Hi-quality Replacement Laptop Battery for SONY VAIO VGN-AR71ZU, VAIO VGN-CR70B/W, VAIO VGN-CR305E/RC, SONY VAIO VGN-CR10, VAIO VGN-CR20, VAIO VGN-CR490, VAIO VGN-CR50, VAIO VGN-CR60, VAIO VGN-CR90 Series, Compatible Part Numbers: VGP-BPS9/S, VGP-BPS9A/S $26.06 This item fits following models: (1) SONY: Sony VAIO VGN-AR71ZU, Sony VAIO VGN-CR70B/W, Sony VAIO VGN-CR71B/W, Sony VAIO VGN-CR72B/W, Sony VAIO VGN-CR305E/RC, Sony VAIO VGN-CR31S/D, Sony VAIO VGN-CR323/W, Sony VAIO VGN-CR33, Sony VAIO VGN-CR382. (2) Sony VAIO VGN-CR10 Series: VAIO VGN-CR11H/B, VAIO VGN-CR11S/L, VAIO VGN-CR11S/P, VAIO VGN-CR11S/W, VAIO VGN-CR11Z/R, VAIO VGN-CR120E/L, VAIO VGN-CR1… |
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New – BTI Lithium Ion Notebook Battery – N27905 $135.92 General Information Manufacturer/Supplier: Battery Technology, Inc Manufacturer Part Number: DL-D620X3 Brand Name: BTI Product Name: Lithium Ion Notebook Battery Product Type: Notebook Battery Battery Information Battery Rechargeable: Yes Battery Chemistry: Lithium Ion (Li-Ion) Battery Capacity: 4800 mAh Output Voltage: 11.1 V DC Miscellaneous Compatibility: Dell Latitude Notebooks: D620 Series D6… |
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6V Vacuum cleaner battery for RC3000 2000mAh Power Tool $51.00 Power tools battery For KARCHER 6V NI-MH 2000mAh.. Compatible part numbers : 2.891-029.0. Compatible tool models : Include: Power Tools Battery x1… |
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30 Pure nickel Solder Tabs for high capacity LiPo, NiCd and NiMh Battery Packs $6.99 30 pcs 2 inch 0.007 thick commercial grade pure nickel solder tabs for RC Toys and Power tool battery pack DYI projects. Best suited for heavy duty / high current draw applications using high capacity NiMh, NiCd, LiPo battery packs…. |
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3.6V 800mAh Ni-CD Cordless Battery For Uniden ANA9710, BBTY0373001, BBTY0414001, BBTY0494001, BP2499, BP990, BT2499, BT990, EXP990, EXR2460, EXR2480, EXS9110, EXS9110i, EXS9500, EXS9600, EXS9650, EXS9660, EXS9800 , BP-2499, BP-990, BT-2499, BT-990, EXP-99 $7.09 3.6V 800mAh Ni-CD Cordless Battery For Uniden ANA9710, BBTY0373001, BBTY0414001, BBTY0494001, BP2499, BP990, BT2499, BT990, EXP990, EXR2460, EXR2480, EXS9110, EXS9110i, EXS9500, EXS9600, EXS9650, EXS9660, EXS9800 , BP-2499, BP-990, BT-2499, BT-990, EXP-99… |
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