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A microcalorimeter has been built by the authors and used to measure internal losses in primary pacemaker batteries. Power dissipation of 10-50 Â¿W has been measured in new pacemaker batteries, much of which is traceable to innocuous exotherm from continuing curing of plastic materials in the battery. True internal shorts have produced 1000-2000 Â¿W of heat. Present noise level is about 3 Â¿W. A noise level of under 1 Â¿W should be achievable. Such a microcalorimeter should prove invaluable for nondestructive early identification of parasitic power losses, both in batteries and in completed pacemakers.