This part of IEC 60952 defines test procedures for the evaluation@ comparison and qualification of batteries and states minimum environmental performance levels for airworthiness. Where specific tests are defined with no pass/fail requirement (to establish performance capability)@ the manufacturer's declared values@ from qualification testing@ will be used to establish minimum requirements for ongoing maintenance of approval for that design of battery. To provide representative examples@ this standard utilises voltage and current values based upon an aircraft electrical system nominally rated at 28 V d.c. Additionally@ the nominal values for cell voltage are assumed to be 1@2 V per cell for nickel-cadmium batteries and 2@0 V per cell for lead-acid batteries. It is important to note that when using this standard to evaluate products designed to operate on an aircraft electrical system other than the nominal 28 V d.c.@ or whose chemical properties are such that the individual cell voltage differs from that stated above@ test values need to be adjusted accordingly. The specific topics addressed in this part of 60952 serve to establish acceptable quality standards required to qualify a battery as airworthy and are divided into 2 classes (class I and II) as defined in Clause 3 of this standard. -Most of the requirements of this Part 1 state the minimum performance level for class I applications which are also mandatory for class II applications. -Subclauses 5.6 and 6.6 state 2 different levels of performance for class I and II applications. -Clause 7 states special requirements for class II applications only. In cases where a specific application demands testing and/or requirements exceeding those detailed in this standard the purchaser will detail said requirements in the product specification and the method of establishing compliance.