Battery pack

When a pack contains groups of cells in parallel there are differing wiring configurations which take into consideration the electrical balance of the circuit.

Most SOC methods take into account voltage and current as well as temperature and other aspects of the discharge and charge process to in essence count up or down within a pre-defined capacity of a pack.

[7][8] More complex state of charge estimation systems take into account the Peukert effect which relates the capacity of the battery to the discharge rate.

Another advantage is the flexibility of their design and implementation, allowing the use of cheaper high-production cells or batteries to be combined into a pack for nearly any application.

At the end of product life, batteries can be removed and recycled separately, reducing the total volume of hazardous waste.

Packs are often simpler for end users to repair or tamper with than a sealed non-serviceable battery or cell.

Though some might consider this an advantage it is important to take safety precautions when servicing a battery pack as they pose a danger as potential chemical, electrical, and fire risks.

[12] The circuit board can contain additional features such as over discharge protection, automatic shut off and charge level indication LEDs.

[23] In one case with a brand called FuelRod, it was sold at an elevated price at various amusement parks with the understanding that they get a perk of free exchange at participating locations.

[25] Per US Federal Aviation Administration regulations, power banks in the United States are not allowed in checked-in luggage.