USB 2.0 Type B female connector

Characteristic:
- Output Type: Fixed
- Voltage Output: 5V
- Manufacturer: ST Microelectronics
- Output Current: 100mA
- Input voltage max.: 30V
- Input voltage min.: 7V
- Operating temperature: 0ºC to + 70ºC
- Encapsulated: TO-92
- Polarity: Positive
- Tolerance output voltage: 5%
- Quantity: 1 unit

Resistor 150R Ohm 5% 0,25W 1/4W features:
-150R Ohm
-Type: Carbon film
-Tolerance: ±5%
-Power: 0.25W
-Dimensions: 2x7mm

The AC 250V 15A 4-pin DPST (on/off) type rocker switch.

Characteristic:
-Metric thread M3
-Male-Female separator 25mm
-Quantity: 5 units

Metal casing with Internal magnet. Power 2W, Impedance: 8 Ohm, Shape: Round, Thickness: 5.3mm / 0.21 ", Diameter: 40mm / 1.6" 

Lot of 65 Male-Male jumper cables. Characteristic: -No soldering required
-You can easily modify or revise the circuits
-Quantity: 65 cables of different lengths and colors
-Cable lengths: 120mm, 150mm, 200mm, 240mm

In the case of a battery pack, the BMS (Battery Management System) balancing protection circuit allows charging and discharging to be individually controlled. That is, the circuit controls that all cells are charged and discharged at approximately the same voltage. The current during charging should be limited, because the cell will "absorb" the current given to it, but a higher current than the one established by the manufacturer (generally a safe current is 1C ) can cause the cell to overheat and, in extreme cases, explode. The same relationship also applies to discharge.

Resistor 100K Ohm 5% 0,25W 1/4W features:
 100K Ohm
-Type: Carbon film
-Tolerance: ±5%
-Power: 0.25W
-Dimensions: 2x7mm