A cordless drill or battery drill is a portable power tool that runs on rechargeable batteries, usually lithium-ion technology. Its wireless design allows great freedom of movement, making it ideal for DIY work, carpentry, assembly and professional use on construction sites.[1]​.

Contenido

Las taladradoras de batería se clasifican por el voltaje de su batería, lo que determina su potencia y autonomía.

10–12V

Compact, lightweight models suitable for household or precision tasks.

14.4V

Balance between power and size. Still present in mid-ranges.

18–21V

Professional range. High power for demanding jobs.

28V

Less common models, aimed at industrial or high-performance tasks.

They started out as low-power electric screwdrivers, but today they fill a very wide range.[4]​.

Battery packs require battery balancing, which is a technique that maximizes the ability of a battery to have all of its energy available for use and increase the longevity of the battery.

The nominal voltage of a battery pack is determined by the number of 3.7V cell subgroups connected in series. Each subgroup can be made up of one or several cells in parallel, which increases the capacity (Ah) of the pack.[8]​.

The presence of intermediate sockets in the pack wiring allows the BMS (internal or located in the charger) to monitor and balance the charge status of each group of cells. This balance is essential in series configurations, since the cells do not automatically balance as they do in parallel. Some low-cost designs use diodes to limit the imbalance between cells, although this technique offers limited protection and can reduce the useful life of the assembly.[9]​.