17670 1800mAh 3.7V Rechargeable Batteries (2-Pack) - UltraFire

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UltraFire® 17670 Rechargeable Battery

1800MAH | 3.7V | PROTECTED CELL

The UltraFire 17670 is an 1800mAh protected rechargeable battery in the slim Ø17 × 69 mm format — perfect for flashlights that need 2×CR123 length with rechargeable savings. Built-in protection keeps charging safe, cycle after cycle.

"Charged these many times, still like new."

- Robert Martinez

"Fits my flashlight and charger perfectly."

- Emily Harris

$18.23

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Free Shipping

Easy Returns

1-Year Warranty

Included

2 PCS

Features

Dependable Power in a Slim Profile
The UltraFire 17670 rechargeable batteries deliver up to 1800mAh capacity (actual ~1600mAh), offering a reliable power source for flashlights, electronics, and other compatible devices.

Built-in Protection for Safety
Each cell is equipped with a protection circuit to guard against overcharging, over-discharging, and short circuits, ensuring safe and stable performance.

Durable & Rechargeable
Engineered with Li-ion chemistry, these batteries are rechargeable and long-lasting, making them a cost-effective and eco-friendly alternative to disposable batteries.

Certified Quality
Comes with a protective storage case and carries CE, FCC, MSDS, and UN38.8 certifications, meeting international safety standards.

Specifications
Reviews

Brand

UltraFire

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Battery Type

17670

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Material

Li-ion

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Capacity

1800mAh

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Actual Capacity

1600mAh

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Rated Voltage

3.7V

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Charge Termination Voltage

4.2V

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Discharge Termination Voltage

2.75V

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Size

69×17×17mm

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Weight

85g

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Chargeable

Yes

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Protective Case

Yes

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Certifications

CE, FCC, MSDS, UN38.8

Works exactly as described. 5 stars.

Perfect fit for my vintage flashlight setup. It's getting hard to find reliable 17670s these days, but these Ultrafire ones definitely hit the mark.

The batteries perform fine and deliver stable power, but be aware of the dimensions. Because of the added protection circuit, they measure 69mm long. They were just a hair too long for the battery tube of one of my older devices. They work great, just make sure your gear has enough clearance for that extra length.

Solid Li-ion cells. I like that the company is honest about the actual capacity being around 1600mAh rather than exaggerating like some other brands. They work flawlessly in my gear. Docking one star just because they took a bit longer to top off than my other batteries, but they hold the power well.