jargon
 LiPo  Lithiumion Polymer
 NiMH  NickelMetal Hydrid
 Discharge Rating
Capacity
Capacity is denonted in milliampers hours (mAh) on the battery. It is the amount of charge stored in the battery. If you have a battery with a capaciy 1 mAh and a motor is drawing 1 mAh then your motor will run for 1 h. In general the \textit{approximate} duration of a battery can be computed by:
\[\mathrm{duration} (h) = \frac{\mathrm{capaciy(mAh)}}{\mathrm{load (mA)} }\]If you have a 4700 mAh battery and it is powering a moter with a 100 mA load, it will keep runing for approximatly 47 hours. reference
Discharge
Battery bank
Combination of multiple batteries reference
 joined in series: voltage increases, capacity remains the same.
 joined in parallel: voltage remains the same, capacity increases.
 series and parallel: both voltage and capacity increase.
A guide to understanding battery specifications
Pixhawk 2.1 battery stuff
 Max continuous current sensing: 30A
 Max burst current: 100A
 Connectors: XT60
Electricity

Ampere: A  base unit. Attractive/repulsive force of \(2 \times 10^{7}\) Newtons between two wires 1m appart is the definition of \(1\,\mathrm{A}\). \(1\,\mathrm{A} = 1\,\mathrm{C} / 1\,\mathrm{s}\)

Coulomb: C  charge transported by a constant current of 1 A in on second. \(1\,\mathrm{C} = 1\,\mathrm{A} \cdot 1\,\mathrm{s}\)

Electrical work is the work done on a charged particle by an electric field.

Watt : W  power. \(1\,\mathrm{W} = \frac{1\,\mathrm{N} \cdot \mathrm{m}}{\mathrm{s}}\)

Volt: V  pressure

Ohm: \(\Omega\)  electrical resistance
voltage
\[V = \frac{\mathrm{potential energy}}{\mathrm{charge}} = \frac{N\cdot m}{C}\]Ohm
 Ah  ampere hour
 mAh  milli ampere hour