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Description
Efest SLIM K4 Battery ChargerSLIM K4 Charger is a intelligent charger that with a Type C USB charging port. It is compatible with Lithium IMR 3. 6V 3. 7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700. LED indicator will show you the status of charger: indicator turns blue in standby mode full charged, white color in charging. SLIM K4 Charger is designed with some smart functions, such as auto detect charging, monitors and charges
SLIM K4 Charger is a intelligent charger that with a Type-C USB charging port. It is compatible with Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700. LED indicator will show you the status of charger: indicator turns blue in standby mode/full charged, white color in charging. SLIM K4 Charger is designed with some smart functions, such as auto-detect charging, monitors and charges each slot independently, low voltage smart activation recovery function, 0V activation recovery function. Besides, it is safe for you to use with built-in intelligent protection chip.
Efest SLIM K4 Battery Charger available to order Online from Vape Gate UAE with a unique Delivery service in UAE, Abu Dhabi, Dubai, Al Ain, Ras Al Khaimah, Ajman, Sharjah, Ruwais
SLIM K4 Charger is a intelligent charger that with a Type-C USB charging port. It is compatible with Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700. LED indicator will show you the status of charger: indicator turns blue in standby mode/full charged, white color in charging. SLIM K4 Charger is designed with some smart functions, such as auto-detect charging, monitors and charges each slot independently, low voltage smart activation recovery function, 0V activation recovery function. Besides, it is safe for you to use with built-in intelligent protection chip.
Efest SLIM K4 Battery Charger Specification:
| Brand | Efest |
| Product Name | SLIM K4 Charger |
| Compatible with | Lithium IMR 3.6V/3.7V batteries: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 26500, 26650, 20700, 21700 |
| Input Power | DC 5V 2A |
| 2*1A CC Current | 2000mA±10% |
| 1*1A CC Current | 1000mA±10% |
| 4*0.5A/3*0.5A CC Current | 500mA±10% |
| Auto Cut-off Voltage | 4.20±0.05V |
| CV Cut-off Current | ＜100mA |
| Standby Current | ＜20mA |
| Activation Current | 50mA~100mA |
| Auto Recharge Voltage | 4.10±0.10V |
| Operation Temperature | 0℃~40℃ |
| Storage Temperature | ﹣40℃~+70℃ |
| Auto-detect Charging Current | 2×1.0A/1×1.0A/4×0.5A/3×0.5A |
Efest SLIM K4 Battery Charger Features:
Efest SLIM K4 Battery Charger Includes:
- Efest Slim K4 Battery Charger
- USB Cable
- User Manual
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4.8 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 5
My son is actually motivated to do a workbook
Format: Paperback
My Kindergartener finished homeschool online early and we have been doing a page a day and he loves it and loves to earn a sticker after each day and put it on his chart. I love how engaging the workbook is and how it introduces some 1st grade concepts. Would highly recommend.
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Reviewed in the United States on January 23, 2026
★★★★★ 5
Excellent Kindergarten prep
Format: Paperback
My daughter is loving all of the learning exercises and has started feeling more confident heading in to Kindergarten.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Excellent Summer Workbooks - Keeps Kids Engaged and Ready
Format: Paperback
These workbooks have been an absolute lifesaver for keeping my kids on track over the summer! I was looking for a resource that would help them retain what they learned and prepare for the next school year without feeling like a chore, and these deliver perfectly.
What I particularly love is how well **organized they are by days**. This structure eliminates any guesswork and makes it incredibly easy to assign manageable chunks of work each day, which helps to **keep my kids consistently on track**. There's no overwhelm, just steady progress.
The content is engaging, and it genuinely seems to reinforce key concepts in a fun way. We've had **absolutely no complaints** from the kids, which is a huge win for any summer learning material! I highly recommend these workbooks for any parent looking for a structured and effective way to bridge the academic gap during the summer break.
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Reviewed in the United States on May 28, 2025
★★★★★ 5
Fun for my Kindergarteners!
Format: Paperback
This activity book is a fantastic, age-appropriate resource that makes summer learning both fun and effective for Kindergarteners transitioning to 1st grade! The pages are thoughtfully designed with easy-to-follow activities that keep young minds engaged while reinforcing essential skills. The addition of flashcards, stickers, and eBooks takes the learning experience to the next level, making practice feel like playtime.
One of my favorite features is the encouragement of hands-on learning and movement through exciting fitness challenges—because learning shouldn't just be about worksheets! It turns what could be a boring review into an adventure filled with creativity and energy. This workbook truly helps bridge the summer gap while keeping kids motivated and excited for the next school year. A must-have for any little learner’s summer routine!
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Reviewed in the United States on March 19, 2025
★★★★★ 5
Recommend
Format: Paperback
Has been a great learning book
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Reviewed in the United States on February 11, 2026