I am pretty new to flying RC planes. From day one I have used Gens Ace lipo batteries from Genstattu.com. I have all of my ESCs set to “soft-cut” mode meaning that the power delivered to the motor is reduced when 3.2 volts is reached. When flying, I land as soon as I experience lethargic throttle response. I have never puffed a lipo 2s battery using this approach.
One thing I have noticed though is that charging rate has a definite impact on flight time. If I charge at 2C or 3C the battery provides less flight time than if I charge it at 1C. In fact if I charge the battery at approximately 0.8C I get nearly 25% better flight time.
For example, I charge my 3S 1300mAh 25C lipo at 2.6Ah (2C), I get about 8 minutes of flight with liberal throttle. If I charge the same battery at 1.0Ah (~0.8C) I get about 10 minutes of similar flight.
This is consistent across the range of batteries I use, ranging from 850mah to 3300mah.
I have managed to puff a 5000mah 3s lipo 35C lipo but that was in a 1/8 scale truggy that was geared too steep in HOT weather AND I drained it to ~3.0/cell. Even that battery hasn’t shown signs of lost capacity despite it’s puffiness but I only charge it at 0.8C – 1.0C for safety. -
The best way to discharge a battery for disposal is to use automobile taillights. Solder your favorite connector to some wire, solder the other end of the wire to one (for up to 3 cells) or two (for up to 6 cells) taillights in series, plug your battery into the newly created discharger for a few hours. Then check the battery voltage to ensure it’s close to 0, cut off the connector, strip the wires and twist them together to ensure that any bounceback voltage goes away, and discard the pack.
What is the difference between a one, two or three cells lipo battery?
The primary difference is voltage! A single cell or (1S) Lipo is 3.7 volts, 2-cell or (2S) Lipo is 7.4 volts; 3-cell or (3S) is 11.1 volts. I am sure you have figured out, each cell is 3.7 volts and depending on how many cells you have in series you can multiply those numbers by 3.7 and that will give you the packs voltage. (Example 3 x 3.7 = 11.1) Running a 3-cell Lipo battery will give you the relative equivalent voltage if you were to run 9 to 10 NiMh or NiCad type cells that are 1.2 volts per cell. Electric motors are capable of running different amounts of voltage.However, it is important that you pay attention to gearing; incorrect gearing with prolong runs from high capacity batteries can results in excessive heat to the motor and the battery. If you are not careful, it is possible the battery could overheat which will cause it to swell and possibly catch on fire or explode be sure to check for proper gearing no matter what motor you run, brushed or brushless.
What is 2S2P: Means there are two cells (2) in series (S) (which makes 7.4 volts) and two (2) in parallel (P) to get capacity. If you were to add another cell in series that would increase the (S), number to and would raise the capacity from 7.4v to 11.1v at that time you would have a 3S2P battery, and that number can increase even more depending on how many cells are added to the pack.
Choosing the right battery:
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Connectors – Make sure they are the same or you need to know how to solderA bigger battery will let you fly for longer but will also impact the performance of your airplane
Some packs may consist of a combination of serial and parallel connections.Lipo batteries commonly have four 3.7V Li-ion cells in series to achieve 14.4V and two in parallel to boost the capacity from 2,400mAh to 4,800mAh. Such a configuration is called 4S2P, meaning four cells in series and two in parallel. Insulating foil between the cells prevents the conductive metallic skin from causing an electrical short.
Most battery chemistries lend themselves to serial and parallel connection. It is important to use the same battery type with equal voltage and capacity (Ah) and never mix different makes and sizes.