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TECHNICAL


Power pack


current that counts though. A big voltage doesn’t necessarily mean big power - there also has to be enough current (and vice versa). In the instance of battery-powered technology, the current depends on the cell types being used, the condition and quality of the cells and the control system put in place to manage them.


As a buyer, be mindful of battery labels that use watts instead of watt-hours or amp hours. This isn’t as helpful because users don’t just want to know how much power the battery generates in a given moment - they want to know how long it can deliver that power. Run time, however, can depend on many factors such as the capacity of the battery to begin with, which tool being used,


how it is being used, how tools are taken care of, and how the batteries are stored.


The full circuit


A basic knowledge of circuits will also help you choose the kit with the best bang for your buck. When battery cells are connected end-to-end in a single row they are in ‘series’. Arranging cells together in series delivers the required voltage (V). When more than one series is combined, the rows of battery cells are connected in ‘parallel’. Adding an identical number of cells in parallel delivers more capacity and run time (Ah). The batteries have been designed to deliver 56V for an extended period of time in order to meet user expectations. To achieve this, we arrange the right number of cells in series to deliver 56V - then increase capacity (Ah) by adding more cells in parallel: (W) Fig. 1a.


Theoretically, a manufacturer could build a battery with more power than a user would ever need for outdoor applications. This is where manufacturers must apply a balancing


act between power and usability. More cells mean more weight and size. That’s why EGO has settled on a 56V platform. We have found 56V provides the optimum balance between petrol matching performance and run-time.


Quality over quantity


Cell consistency is also critical to battery performance. Inconsistencies could lead to over-charging and discharging, which can impact battery lifecycle and create potential safety issues. When selecting the right manufacturer for battery-powered tools, look for a brand that uses high-quality cells and a company that continually assesses the market to ensure the best quality. In addition to sourcing components from the world’s leading suppliers, our tests and selects every single cell before building a battery. This includes testing and sorting each cell to ensure only those with the most consistent voltage are used while monitoring and managing each cell during operation. Power is nothing without control which is why the Power+ 56V Arc Lithium battery is continuously controlled by software, microprocessors and power management systems.


Microprocessors and software within the


It’s the relationship between voltage and current that


Fig. 1a


counts. A big voltage doesn’t necessarily mean big power - there also has to be enough current (and vice versa)


132 PC June/July 2020





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