Plan your thermal scope battery supply around your scope’s operating-time rating, with manufacturer-approved spares when an outing could outlast it. Our PFI-C335 is rated for at least five hours at 25 °C (77 °F) with Wi-Fi off, so longer outings need a plan for additional capacity, while cold-weather use calls for a temperature-relevant run-time check.

For handheld optics, our thermal monocular battery article addresses that separate product category.

Thermal Scope Battery Run Time

Use your exact model’s operating-time rating to plan powered-on hours, with reserve capacity for delays. Compare ratings with their temperature and wireless settings attached. Standby time describes a separate operating state, so keep standby figures separate when estimating how long you can actively use a thermal scope.

Our operating-time ratings for these models carry explicit temperature and Wi-Fi conditions.

Keep those conditions alongside any figure you save for comparison. If you intend to use Wi-Fi, the rating’s Wi-Fi-off condition matters to your planning.

The time specification for the PFI-P435 Pro in our Pegasus Pro range refers to standby. That model uses two internal rechargeable lithium batteries and one external replaceable CR123A. Its battery arrangement and time category both deserve attention when comparing it with another model.

Spare Batteries Start With the Exact Model

Identify the full model code before selecting a replacement battery. For PFI-C225, PFI-C335, PFI-C635 and PFI-C650, the specified battery type is a replaceable 18650 lithium battery. Check our Cetus model specifications against your scope’s code, then use the model’s manual for the complete replacement requirements.

PFI-P335LRF, PFI-P635LRF and PFI-P650LRF in our Pegasus 2 LRF range combine an internal rechargeable 18650 lithium battery with an external, replaceable and rechargeable 18650 lithium battery.

Match any spare to the full manufacturer specification, including voltage and any required cell features. Use the battery-change procedure in the exact model’s user manual, available through our Download Center. Confirm the model’s power-management behavior during replacement before relying on uninterrupted operation.

USB Charging and Connected Operation

A USB connector label alone leaves charging and connected-operation capabilities unresolved. The model’s instructions determine how you can use the port and which supply is appropriate.

Before including USB power in your outing plan, check the manual for each function you intend to use.

• Whether the scope can charge a battery through its USB port.
• Which installed battery, if any, that charging function serves.
• Whether operation while connected is supported.
• The required input and approved charging equipment.

Treat charging a removable battery in a separate charger as another model-specific compatibility question. Follow the battery and charger instructions together.

Cold Weather Needs a Separate Battery Plan

For a cold-weather outing, check run time with your intended settings in temperatures close to those expected, following your model’s instructions. Lower temperatures can reduce usable lithium-ion battery capacity during use. Record the conditions and usable operating time, then leave reserve capacity for delays.

A scope’s operating-temperature range describes the conditions in which the device is specified to function. A battery operating-time rating describes duration under its own test conditions. Keep both in view when planning an overnight or freezing-weather outing.

Charging has its own temperature limits. The Canadian Centre for Occupational Health and Safety recommends room-temperature charging for rechargeable lithium-ion batteries and advises against charging below freezing unless the manufacturer permits it. Check the applicable charging limits before connecting a cold battery to a charger. CCOHS lithium-ion charging guidance

Battery Handling and US Recycling

Use the model’s instructions for removable-battery handling, transport and storage. For a scope with an internal battery, ask our after-sales support or the receiving collection program how to prepare the complete device for disposal.

In the United States, the Environmental Protection Agency directs lithium-ion batteries and devices containing them to separate recycling or household hazardous-waste collection points. Keep them out of household trash and curbside recycling. Check your local program’s acceptance and preparation instructions before drop-off. EPA lithium-ion battery disposal guidance

Battery Checklist Before a Long Outing

When comparing a new optic, make the thermal scope battery arrangement part of your model selection. Before departure, save the exact model’s user manual offline and keep these details easy to find.

• Battery identification. Record the full scope model code and complete replacement-battery specification.
• Power allowance. Note your expected powered-on hours and the reserve capacity you’re carrying.
• Replacement procedure. Find the instructions for changing the battery and managing power during the change.
• Charging plan. Confirm the approved equipment and charging-temperature limits for each rechargeable battery.

Domande frequenti

How Many Spare Batteries Should I Carry?

Base the count on your expected powered-on time, your model’s operating-time rating and reserve capacity for delays. Use only replacement batteries approved for the exact model.

Can I Use Any 18650 Battery?

The 18650 designation alone leaves compatibility unresolved. Match the complete battery specification in your scope’s user manual, including voltage and any required cell features.

Does USB-C Confirm Charging Support?

Charging support comes from the exact model’s instructions. Check the permitted charging function, input requirements and equipment before using the port.