Battery lab testing and the limits of the datasheet: Page 3 of 3

September 09, 2013 //By Achim Loesch
Battery lab testing and the limits of the datasheet
Achim Loesch of Varta Microbattery explains how the engineer can infer a certain amount of information about the expected performance of a battery system in a real application from specifications contained in the cell’s datasheet.
and storage at temperatures far below 25°C can be expected. Clearly, for the designer of a pedelec a cell’s datasheet specifications showing performance at a constant current and a constant mild
temperature are not adequate as an indication of the performance of the battery pack in the field.

The effect of abuse on a battery Other conditions are, in any case, explicitly not specified in the datasheet of the cell or any other component of the battery pack. Abuse takes many forms, but its effects can be hard to predict. Manufacturers of portable data loggers, for instance, know that their devices will occasionally be accidentally dropped by users, normally from around waist-high to the ground. Other abuse conditions suffered by battery-powered devices include over- and under-temperature, use of nonapproved chargers, and vibration. A battery pack can potentially fail for mechanical or electrical reasons when subject to abuse. But how much abuse leads to failure? How is the data logger manufacturer to know whether the battery can withstand multiple drops?

Achim Loesch is General Manager for the Power Pack Solutions at Varta Microbattery - www.varta-microbattery.com

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