MEDICAL, MILITARY & INDUSTRIAL ELECTRONICS FEATURE
Pros and cons for the rechargeable cell/battery pack T
he use of a single AA rechargeable cell could save the use of many hundreds of non-rechargeable batteries. There are three major rechargeable technologies in use today: Lead Acid, Nickle Metal Hydride and Lithium Ion. Typically, a single Nickel Metal Hydride cell, used and maintained correctly, with the right charger, could save as much as 12 thousand grams in equivalent Alkaline battery waste throughout its defined lifetime. This is further magnified if you consider rechargeable Lithium Ion batteries.
Alongside technical suitability, whole life cost must be considered. Initial outlay for rechargeable cells and a quality charger may seem high, but consider the number of charge cycles and energy required to recharge them; cost per cycle, per cell is only pennies. Of course, not all applications can run on a couple of AA cells, so any design should also consider the use of multiple cells - often in the form of a ‘custom’ battery pack (like the kind you see in an electric drill). Even with greater expense in manufacturing,
there are obvious advantages such as space consideration, duration and power levels that offset the higher production costs – which are then, mostly, transferred to the consumer. One must appreciate and respect the needs of the lowly battery. It is often the case that rechargeable cells and batteries are inadvertently over charged or discharged, leading to the significant reduction of cyclic life. Failing to address these key elements surrounding battery management can dramatically affect performance, cost and importantly, consumer safety. Selection of technology must also consider these issues of safety and suitability regarding transportation and handling. Understanding defined regulations for different battery technologies (chemistries) can reveal potential hidden costs - Lithium cells can often be listed as Class 9 – and dangerous goods, limiting use to expensive specialist carriers.
H-Squared
www.h-squared.co.uk
/ ELECTRONICS
ELECTRONICS | FEBRUARY 2020
31
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