PHYSIO CONTROL - LIFEPAK 500 AED Battery (non-rechargeable lithium) A long-life low-maintenance battery pak designed for low or infrequent use environments. The lithium battery pak requires less maintenance than the SLA battery pak since it never requires recharging. A new lithium battery pak may last up to 5 years when installed in the LIFEPAK 500 AED under optimal conditions.

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