Toshiba laptop battery

During the last decade, most people have gradually been switching to rechargeable batteries. Improvements in battery technology, better charge methods and more readily available power sources made this possible. The most important single reason, however, is cost.

Another advantage of secondary batteries such as Toshiba laptop battery is low internal resistance. This allows high current on demand, an attribute that is essential for digital devices and instruments needing high inrush currents. Power tools, for example, could not be run effectively on alkaline batteries.
But rechargeable batteries e.g. PA3331U-1BRS have their limitations. Beside marginal energy density, secondary batteries have a defined shelf life and lose the ability to hold charge as they age. Similar to a spring under tension, a secondary battery E.G.PA3331U-1BRS  seeks to revert back to its lowest denominator.

Secondary batteries E.G.PA3107U-1BRS need some level of battery maintenance. Only if periodically discharged do nickel-based batteries provide the cost-effective and reliable service expected in a fleet environment. The deep discharge reverses the crystalline formation (memory) that occurs if a nickel-based battery is repeatedly charged on top of a residual charge. lithium batteries E.G.PA3107U-1BAS  have no memory and an occasional discharge is applied to verify performance. Battery maintenance is best done with a battery analyzer.

Battery aging is subject to cycling, storage temperature and state-of-charge. While a primary battery has a shelf life of 10 years, lithium-based batteries E.G.PA3356U-1BRS are good for 2-3 years in normal use. Cool storage at a 40% charge level prolongs longevity. Nickel-based batteries are good for 5 years and longer but require priming to regain performance after long storage.

Another negative of rechargeable batteries is the high self-discharge. nickel-based batteries exhibit a 10-20% self-discharge per month. This compares with 5-10% for lithium and lead-based batteries. The self-discharge increases at higher temperatures. For this reason, secondary batteries are not an effective media for long-term energy storage; primary batteries are better suited. A secondary battery E.G. PA3383U-1BRS can never be removed too far from the charger. It needs to be fed before each activity.

Secondary batteries E.G. TOSHIBA PA3107U-1BRS have a limited cycle count. The number of cycles achieved is based on the depth of discharge, environmental conditions, charge methods and maintenance procedures. Each battery chemistry behaves differently in terms of aging and wear.

In the US Army, rechargeable batteries are being used predominately for training. Officials are now exploring their suitability for combat missions. Rechargeables have advantages that go beyond cost issues. For one, the batteries can be re-used and do not burden the supply channels. In the absence of electric power, charging can be done through solar power, windmills and hand-crank generators. Even kinetic power is being explored in which an electric generator is built in the sole of the soldier’s boot. Rechargeable batteries are able to providing power when no supply of fresh batteries is possible.

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