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Efest Slim K2 Battery Charger
The Efest Slim K2 Battery Charger is a compact, dual-slot charger for 3.6V/3.7V lithium batteries. It charges at 1A with safety features like overcharge protection. Priced at $11.00, ideal for vaping devices, flashlights, and electronics.
$11.00
● In stock
Buy at Smoke Cartel →Price and availability may change. Click to see current details on Smoke Cartel.
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Key features
- Dual-slot design for simultaneous charging
- 1A charging speed with safety protections
- LED indicators for battery status
- Compatible with 18650, 21700, and more
- Portable piano-string design for durability
- Micro USB input for versatile power sources
- Overcharge, short-circuit, and reverse polarity protection
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Pros
- +Safe charging with overcharge protection
- +Compact and portable for on-the-go use
- +Charges multiple battery types efficiently
- +LED indicators show charging status
- +Affordable price for reliable performance
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Cons
- −No USB-C port for faster charging
- −No included carrying case for storage
- −Limited to 1A charging speed
- −No advanced features like fast charging
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About Efest Slim K2 Battery Charger
What is Efest Slim K2 Battery Charger?
The Efest Slim K2 Battery Charger is a portable, dual-slot device designed to charge 3.6V/3.7V lithium batteries efficiently. With a 1A charging speed and advanced safety features, it ensures reliable performance for users needing consistent power solutions. Its compact design and LED indicators make it user-friendly for both beginners and experienced users.
Key features
- Dual-slot design — Simultaneous charging of two batteries.
- 1A charging speed — Efficient power delivery for common lithium batteries.
- Safety protections — Overcharge, short-circuit, and reverse polarity safeguards.
- LED indicators — Visual feedback for charging status and completion.
- Compatibility — Works with 18650, 21700, 14500, and other standard lithium cells.
- Portable piano-string design — Durable, lightweight construction for on-the-go use.
- Micro USB input — Versatile power source compatibility.
Who is Efest Slim K2 Battery Charger for?
This charger suits vapers, DIY enthusiasts, and outdoor adventurers who rely on lithium batteries for devices like flashlights, e-cigarettes, and power tools. Its safety features and portability make it ideal for users prioritizing reliability and convenience.
How does Efest Slim K2 Battery Charger compare?
The Slim K2 outperforms basic single-slot chargers with its dual-slot design and advanced safety mechanisms. While it lacks USB-C support, its 1A charging speed and compact form factor provide a cost-effective alternative to bulkier models, offering balanced performance for everyday use.
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Best use cases
- →Charging vape batteries for e-cigarettes
- →Recharging flashlights and LED tools
- →Maintaining power for electric bikes
- →Powering DIY electronics projects
- →Keeping emergency lights ready
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Is Efest Slim K2 Battery Charger right for you?
Ideal for vapers, DIYers, and outdoor enthusiasts needing reliable battery charging. Suitable for basic to intermediate users. Alternatives include standard battery chargers, but the Slim K2 offers better portability and safety features.
How it compares: The Efest Slim K2 offers a compact, safe alternative to bulkier chargers. It outperforms basic models with its dual-slot design and advanced safety features, though it lacks USB-C and faster charging options.
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More from Smoke Cartel
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Frequently Asked Questions
What batteries does the Efest Slim K2 charge?
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The Efest Slim K2 charges 3.6V/3.7V lithium batteries like 18650, 21700, and 14500. It's compatible with most common battery types used in vaping, flashlights, and electronics.
Does the Slim K2 have overcharge protection?
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Yes, the Slim K2 includes overcharge, short-circuit, and reverse polarity protection to prevent damage to batteries and the charger itself.
How long does it take to charge batteries?
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Charging time varies by battery capacity, but the 1A output ensures efficient charging for standard lithium cells, typically completing in 2-4 hours.
Is the Slim K2 compatible with all lithium batteries?
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It works with 3.6V/3.7V lithium batteries including 18650, 21700, 14500, and others. Check battery specifications for full compatibility.
Can the Slim K2 be used internationally?
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Yes, its AC input supports 100~240V 50/60Hz, making it suitable for use in most countries with standard power outlets.
How much does Efest Slim K2 Battery Charger cost?
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Efest Slim K2 Battery Charger is $11.00 at Smoke Cartel. Prices may change — click through to Smoke Cartel for the latest.
Is Efest Slim K2 Battery Charger in stock at Smoke Cartel?
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Yes, Efest Slim K2 Battery Charger is currently in stock at Smoke Cartel.
Are there coupon codes for Smoke Cartel?
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Yes — Love Those Deals currently tracks 4 active Smoke Cartel coupons. See the coupons section on this page to copy a code before checkout.
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Specifications
- SKU
- SLIMK2
Last updated May 14, 2026