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Lipo Battery Basics |
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Stryker
Basics 2K Fun Stryker Build |
The diameter or (capacity) of pool could be thought of as MAH.
As an example we will use a 7.4v 2200mah 7.4v could be seen as the amount of water pressure pushing down thru the hose, the deeper the water the more pressure would be pushing down on the hose increasing flow. Pressure or Volts = speed 2200mah could be thought of as "how wide the pool is", the wider the pool the longer it will take to empty. Making the pool wider will also increase the flow (higher amps). The capacity or Mah = duration The diameter of hose would be amps, the bigger the hose the more flow. Like gallons of water per hour or Amps. To get watts you would simply multiply (water pressure x flow) or in battery terms (Volts x Amps) = Watts. Each cell has a nominal voltage of 3.7 volts. A fully charged cell holds about 4.2v and a fully discharged cell 3.0v. Cells can also be run in series or parallel but need to be identically matched, meaning if you have a 20C 2200mah, all cells in the pack should be 20C 2200mah and in the same state of charge. Lets start with a
3 cell
1100mah for a demonstration. Series, you only add the volts for each cell so 3.7 x 3 = 11.1v and the 1100mah dont change. Parallel would look like this: ( + + + - - - )
Parallel, you only add the mah for each cell 3 x 1100 = 3300mah and the 3.7v dont change.
Series connected cells will give you
higher volts (speed) If you want a certain volt/mah you would need to run some cells in parallel and some in series depending on what you need. Lipo battery packs are listed by the number of cells in series (S) followed by the number of cells in parallel (P). (like: 3s2p) Multiplying these two numbers gives the number of cells in the battery pack. So a 3s2p pack would have 6 cells (3x2 = 6) or a pair of 3 cells. For each of the three series connected cells there would be a parallel connected cell. Battery combinations for 2100mah: 2s 2100mah =
(2) cell 7.4v 2100mah 3s 2100mah =
(3) cell 11.1v 2100
5s 2100mah =
(5) cell 18.5v 2100 6s 2100mah =
(6) cell 22.2v 2100 And so on.... If we wanted more rpms or speed we might go from a 3 cell 11.1v to a 4 cell 14.8v with a total of 4 cells, you get more volts but the mah stay the same. If we wanted more duration we might try a 3s2p where the volts stay the same and the mah is higher (3x3.7 = 11.1v) (2x1100 = 2200mah) with a total of 6 cells. Another common way of doing the same thing would be buying two of the same batteries and use a "Y" connector. Example: if you wanted a 4 cell you could use two 2 cells, or maybe an 8 cell using two 4 cells, the "Y" connector connects two batteries together as one. A "Parallel Y" connector increases the mah and current and the "Series Y" connector increases the volts. See image below:
Lipos also have a "C" rating which rates the batteries ability to charge/discharge at high currents. Most lipos will have a Charge C and Discharge C . Example: Discharge 25C and Charge of 1C. If we was using a 2200mah battery with a rating of 25C we would first multiply 2200x25 = 55000 then divide 55000/1000 = 55 discharge amps. Incase you was wondering (1000 milliamps = 1 amp). All we are doing here is multiplying the C rating times the mah then dividing by 1000 to convert the C rating into amps. The same formula works with charge rates, if your 2200mah battery has a charge rate of 1C then 1x2200 = 2200 then divide 2200/1000 = 2.2 charge amps.
Beyond Battery
Basics |
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