Understanding the LiPo Battery for electric start

LiPo batteries are used in PPG for Electric Start and full on electric paramotors.

Example Battery for starting a paramotor:

2200 Mah (milli amps) 2.2 amps

4s1p (made up of 4 cells) 14.8v (each cell 3.7v)

35c to 45c (discharge rate)

(35c? 2.2amps x 35c = 77 amp output with a max 30second burst of 45c x 2.2amps = 99amps)

Plug type: JST-HX (in this case (a 4 cell battery) its a 5pin balance lead.

Discharge Plug: XT60 (the connector type proving to be popular)

weight: 250 grams (wow what a weight saving over lead acid at 2600 grams/ 2.6kg)

Charge rate max of 2c (requires a balance charger) optimum charging is usually 1c which in this case is 2.2 amps charging this battery at 2c would require 4.4 amps. Never exceed what is stated on your battery. If in doubt always charge at 1c or less.

Above battery can be found for about £25

If the battery was larger for example:

Minimum Capacity: 3000mAh
Configuration: 4S1P / 14.8v / 4Cell
Constant Discharge: 40C
Peak Discharge (10sec): 50C
Pack Weight: 360g
Pack Size: 143 x 42 x 28mm
Charge Plug: JST-XH
Discharge plug: 4mm Bullet-connector

3000mAh = 3.0 amps x 50c = 150amps available for starting.

This battery is around £45

For electric paramotors many of these batteries are linked together in series and parallel to create voltages as high a 44v to 60v depending on the motor requirements.

Batteries wired in series increase voltage 14.8 + 14.8 + 14.8 + 14.8v = 59.20 volts

Batteries wired in parallel increase the Ah (amp hour) 3.0 x 4 = 12 aH

This looks good but half of the batteries are wired in parallel and half in series for another example we take

ad: performance high powered e-bike mbt http://www.performance-ebike.co.uk

22.2 volt 6s lipo packs that are 5000mAh.

We would need 4 packs to generate 44.4v and 10 aH (2 batteries in parallel and 2 in series)

all this power would give us about 15 minutes flying time at 35kg thrust depending on the motor used.

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