Armytek 18650-21700 Adapter for Lithium-ion Battery allows you to use the smaller 18650 battery pack to power your lights with the standard 21700 battery pack. They extend the diameter of the 18650 battery and increase the length.
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Astronomy
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- Astronomical telescope
- Telescope mounts
- Eyepiece
- Astrocamera
- Filter
- Filter wheel, filter drawer
- Focal reducer, corrector
- Accessory for astrophotography
- Finderscopes
- Adapter
- Barlow lens
- Solar telescope
- Telescope diagonals
- Focuser
- Binoviewer
- Power supply
- Telescope mount motor drives
- Mount accessory
- Collimation
- Accessories for ZWO Seestar smart telescope
- Astronomical literature
- Storage
- Dew remover
- Miscellaneous
Nature observation
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- Binoculars
- Monoculars
- Spotting scopes
- Spotting scope eyepieces
- Photo tripod
- Spotting scope cases
- Accessories for nature observation
Outdoor
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- Flashlight
- Laser rangefinder
- Accessory for flashlight
- Battery
- Battery charger
Hunting
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- Thermal imaging device
- Thermal imaging rifflescope
- Nightvision rifflescope
- Hunting camera
- Hunting camera accessories
- Thermal camera and night vision accessories
Microscopy
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- Microscope for children
- Biological microscope
- Stereo microscopes
- Digital microscopes
- Microscope camera
- Prepared slides
- Microscope eyepiece
- Microscope objective
- Microscope optical accessory
- Microscope accessory
Information
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- FAQ
- Knowledge base
- Loyalty program
- Product support
- General terms and conditions
- Service form
- Purchase widthdrawal form
Knowledge base