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release time:2024-04-03 Hits: Popular:AG11 battery
Calculation of voltage and number of batteries
The characteristics of lithium polymer batteries during charging and discharging are different from those of nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH) batteries, when a single lithium battery is fully charged, the voltage is about 4.2V, and the single voltage is about 3V when the full discharge is completed. When using lithium batteries, we should keep the voltage of a single lithium battery between 3 and 4.2V, and overcharge and overdischarge will cause harm to lithium batteries. Don't forget to set the cut-off discharge voltage of your electronic transmission to avoid lithium overdischarge.
If you have flown with nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH) batteries, since the voltage of a single nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH) battery is 1.2V, and the lithium battery is 3.6V, you will need to do some conversion. If you originally used 6 to 7 nickel-cadmium or nickel-metal hydride batteries, you can use two lithium batteries in series to obtain an approximate voltage. If you originally used 10 to 11 nickel-cadmium or nickel-metal hydride batteries, you can use three lithium batteries in series to obtain an approximate voltage.
Many flying friends originally used 8 nickel-cadmium or nickel-metal hydride batteries, and there will be a choice between choosing two or three lithium batteries in series to achieve an approximate voltage. In my experience, the best choice is to first understand the wattage (W) required to fly with nickel-cadmium or nickel-metal hydride batteries, and then use lithium batteries, motors, and propellers in combination to achieve similar power output.
For example: if your previous aircraft had a Class 400 motor, use 8 nickel-cadmium or nickel-metal hydride batteries (9.6V) and the current is 10 amps during flight. You need to lose 9.6×10 = 96 (W) watts of power per second, so if you use two lithium batteries (7.2V), you may have to change paddles to fly, with a current of 13 amps; Or use three lithium batteries (10.8V) and switch paddles to fly at 8.9 amps. Pairing estimates such as these require a bit of experience to get the best results, but calculating power output on this basis is a good way to start.
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