Ps-855b Maintenance Manual -

If the LED fails to illuminate or stays on for less than 5 seconds, the capacity is below 50% and requires a full recharge cycle. Above 50% Capacity: Charge for 8 hours. Below 50% Capacity: Charge for 16 hours.

If the stays illuminated for the full 5 seconds, capacity is above 50%. ps-855b maintenance manual

A condition check must be performed every quarter or half-year to verify the unit's operational status. This is similar to a "Preflight Check" and ensures the unit is ready for emergency deployment. If the LED fails to illuminate or stays