How Often do You Need to Recharge Batteries in Electronic Devices?

Rechargeable batteries are an essential component of our modern life - they're in our phones, laptops, cameras and cars - so it pays to know what type of battery you're using, and how to get the most out of them. How NCR Printed Forms Actually Work "With certain types of rechargeable batteries, letting them run completely flat and then recharging them back to full capacity each time is the best way to prolong their life," says Professor Maria Skyllas-Kazacos from the School of Chemical Engineering at the University of New South Wales. "That's because some batteries, mainly nickel-cadmium and nickel-metal-hydride suffer from a drop in voltage that is often referred to as the 'memory effect'. This happens when you cycle them through only short amounts of discharge before recharging." "It then becomes extremely hard to recharge these batteries higher than a certain point meaning they won't last as long between recharges, and need to be recharged more often. Most of the memory effect problems experienced by nickel-cadmium batteries, were caused by overcharging and poorly designed chargers," says Skyllas-Kazacos. Many consumer electronics such as laptops and cameras, however, now contain lithium-ion batteries, which don't suffer from the 'memory effect'. Skyllas-Kazacos says it is often recommended that these type of batteries receive regular 'top-off'charges during the day when possible, and fully discharging and recharging the battery every 30 charges or so. This reduces the likelihood that the cells get out of balance, and helps maintain the accuracy of the 'fuel gauge'on the device. How do they work? Nickel-cadmium (Ni-Cd) batteries, which are the original type of rechargeable battery used in consumer electronics, use nickel hydroxide and cadmium electrodes with potassium hydroxide as the electrolyte. They have been largely superseded by nickel-metal-hydride (Ni-MH) batteries. Ni-MH batteries, which are used in consumer electronics and electric cars, offer twice the energy density of nickel-cadmium batteries and are less environmentally damaging as they don't contain heavy metals such as cadmium. They also differ by using a metal alloy negative electrode capable of storing a large amount of electrons. The metal-hydride is produced as the charging product.