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Because they resist memory effect, these genuine Sony batteries will not prematurely reduce your recording time.

Battery Type/Battery Series Name: "InfoLITHIUM® M" Series Battery Type-2 InfoLITHIUM®
Output Voltage- Mean: 7.2V
Battery Capacity- 8.5Wh
Battery Capacity-2- Capacity Indicationer on Package: Up to 2.5hrs (with DCR-TRV10E)