Weltool BB11 Extension Tube – Dual 21700 Battery Tube for F11R Flashlight
SKU: 48957447217

Weltool BB11 Extension Tube – Dual 21700 Battery Tube for F11R Flashlight

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Description

Weltool BB11 Extension Tube – Dual 21700 Battery Tube for F11R FlashlightWeltool BB11 Extension Tube The Weltool BB11 (F11R ExtensionTube) is a flashlight accessory and dual battery extension tube made for the Weltool F11R flashlight. Installing the BB11 lets the F11R run two 21700 rechargeable lithium ion batteries (such as the Weltool INR21 60) for significantly longer runtime. Highlights Doubles battery capacity run two 21700 lithium ion batteries Made for the Weltool F11R flashlight Longer runtime for extended sessions

Weltool BB11 Extension Tube

The Weltool BB11 (F11R-ExtensionTube) is a flashlight accessory and dual-battery extension tube made for the Weltool F11R flashlight. Installing the BB11 lets the F11R run two 21700 rechargeable lithium-ion batteries (such as the Weltool INR21-60) for significantly longer runtime.

Highlights

  • Doubles battery capacity — run two 21700 lithium-ion batteries
  • Made for the Weltool F11R flashlight
  • Longer runtime for extended sessions in the field
  • Extension tube only — flashlight and batteries sold separately

Specifications

Model Weltool BB11
Compatibility Weltool F11R Flashlight
Battery Support 2 × 21700 lithium-ion (e.g. INR21-60), not included
Material Aluminum alloy, anodized finish
Includes Extension tube only

Frequently Asked Questions

What does the Weltool BB11 extension tube do?

The Weltool BB11 (F11R-ExtensionTube) lets the Weltool F11R flashlight use two 21700 lithium-ion batteries instead of one, increasing runtime.

Which flashlight is the Weltool BB11 compatible with?

The Weltool BB11 (F11R-ExtensionTube) is designed for the Weltool F11R flashlight.

What batteries does the Weltool BB11 use?

With the Weltool BB11 (F11R-ExtensionTube) installed, the F11R accepts two 21700 rechargeable lithium-ion batteries such as the Weltool INR21-60. Batteries are not included.

Does the Weltool BB11 include a flashlight or batteries?

No. The Weltool BB11 (F11R-ExtensionTube) is the extension tube only; the F11R flashlight and 21700 batteries are sold separately.

Why use a dual-battery extension tube?

The Weltool BB11 (F11R-ExtensionTube) roughly doubles available battery capacity, extending runtime for longer tasks without recharging.

Where can I buy the Weltool BB11?

You can buy the Weltool BB11 (F11R-ExtensionTube) at Going Gear. Going Gear is an authorized Weltool dealer.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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  • Delivery to the USA:
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 48957447217

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Streamtrout
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★★★★★ 5
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Built with real quality, keeps outdoor smells out.
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Reviewed in the United States on April 18, 2026
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Reviewed in the United States on March 19, 2026
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DB
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★★★★★ 5
Much Needed Cabin Air Filter Replacement!
This Cabin air filter replacement is working well. It had been a long time since I replaced my cabin filter, so this was a much needed replacement. It was easy to do, and a much needed replacement. The air quality inside my car is much better. It smells fresh, and light and airy now.
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TJK
Fort Morgan, US
★★★★★ 5
Best cabin filter I've ever seen
This is the most complex and over-engineered cabin air filter I have ever seen, and I mean that in a good way! The overall shell is a hard plastic, and inside it are two basic parts; the filter (HEPA quality) and the loose fill activated charcoal. The filter media appears to be operating room quality, and if I were to guess, I would say it's like a MERV 14 or greater. The pleats are plentiful, and the spacing of the pleats are perfect, as well as the attachment of the media to the filter frame. The charcoal is a loose style fill, and it fits between the back of the filter media and the filter screen on the very back. This must have 5 times the amount of charcoal compared to the charcoal infused media you can get from many suppliers. The frame fits perfect in my 4runner, and it is hard plastic with good gasket material to further help the effectiveness of the media. All in all, this is an incredibly engineered filter, and if you're the type that wants nothing but the best for your vehicle, you've come to the right place by choosing this one. It is pricey, at $20 for one filter at the time of writing this review, but this is a textbook case of "you get what you pay for." I am going to start only buying these from now on, as they are the best quality and construction filter I have seen, and I highly recommend this filter!
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Reviewed in the United States on November 3, 2025
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jorban
Charlottesville, US
★★★★★ 4
A Simple, Affordable Cabin Filter That Does the Job
I have a mechanic I really trust, which is no small thing these days. The trade off is that he charges a little more for routine services like oil changes, and those visits always include a full vehicle inspection. To manage the cost, I make a point of handling the easy maintenance items myself so he does not feel the need to replace them with higher priced OEM parts. Cabin air filters fall squarely into that category. It takes me about two minutes to replace one, and doing it myself typically saves around fifty dollars. That was the motivation behind picking up this filter for my Toyota Sienna. Right out of the package it fit perfectly. The size is exact, which is important since cabin filters need a snug frame to work properly. There is a clear airflow direction arrow printed on the side, which is one of the two key things I always look for. Without that, it becomes guesswork and you risk installing the filter backward. With the arrow in place, installation is a quick slide and close operation. Functionally, cabin filters are hard to evaluate in real time. You do not get a dramatic change the moment you swap them out. What I rely on instead is whether they fit correctly, whether they load evenly over time and whether they avoid shedding material as they age. Based on construction and feel, this one meets those expectations. It is pleated well and the frame holds its shape. All signs point to it filtering properly, which is the baseline requirement. Because cabin filters need changing fairly often, it never makes sense to overspend on OEM versions unless you have a specific airflow sensitivity or unique environmental need. This filter costs far less and performs the key functions just as well for general use. In my Southern California environment, where dust and pollen appear regularly, I prefer to replace filters on the more frequent side, which makes the lower cost even more practical. The simplicity of the whole process is what I appreciate most. No tools, no struggle, no surprises. The filter pops in cleanly, the compartment closes and the job is done. When paired with the peace of mind of not paying dealership pricing for such a simple part, it becomes an easy product to recommend. A dependable, properly fitting cabin filter at a very reasonable price. Four stars.
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Reviewed in the United States on December 4, 2025

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