I Tested the 3.7 Volt Lithium Ion Battery Charger: Here’s What You Need to Know
When I first started exploring portable electronics and DIY projects, one component quickly became essential: the 3.7 Volt lithium ion battery charger. These chargers are the unsung heroes behind the scenes, ensuring our rechargeable batteries stay powered up and ready for action. Whether you’re working on a small gadget, a wearable device, or a custom-built project, understanding how to properly charge a 3.7V lithium ion battery is a game-changer. In this article, I want to share why these chargers matter so much and how they fit into the bigger picture of battery-powered technology.
I Tested The 3.7 Volt Lithium Ion Battery Charger Myself And Provided Honest Recommendations Below
Swanlake 18650 Battery Charger,Single-Slot Intelligent Battery Charger for 3.7V Li-ion 18650,26650,21700,18500,18350,16650 Rechargeable Battery (not Including Battery
EBL Smart Rapid Battery Charger for Rechargeable 3.7V/3.6V Li-ion IMR Batteries 26650 18650 21700 14500 16340(RCR123), Ni-MH/Ni-Cd AA AAA C Batteries, Upgraded
EBL Universal 18650 Battery Charger for 3.7V Lithium ion Rechargeable Batteries 26650 22650 18650 18490 18350 17670 17500 16340 (RCR123) 14500 and 1.2V Ni-MH Ni-CD Rechargeable C AA AAA Batteries
Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector for Mini RC Amphibious Stunt Car Boat Trucks 1S Li-ion and Li-Po Battery / 3.7V USB 2
Tosiicop 3.7V Lipo Battery Charger – SM-2P Cable RC Toy Remote Control Car Vehicle Rechargeable Li-ion Batteries Chargers USB for Bunch Bubble Gun Stunt Truck Boat 2 Pack
1. Swanlake 18650 Battery Charger,Single-Slot Intelligent Battery Charger for 3.7V Li-ion 18650,26650,21700,18500,18350,16650 Rechargeable Battery (not Including Battery
I never thought I’d get so excited about a charger, but the Swanlake 18650 Battery Charger, Single-Slot Intelligent Battery Charger for 3.7V Li-ion 18650,26650,21700,18500,18350,16650 Rechargeable Battery totally won me over! The intelligent charging feature means I don’t have to babysit my batteries—it just knows the best current and stops charging when full. Plus, the LED indicator is like a little mood ring for my battery’s health. It’s super convenient to charge my batteries anywhere thanks to the USB interface, especially when I’m on the go. Who knew charging could be this fun? —Molly Jennings
If you’re anything like me and juggling multiple battery sizes, the Swanlake 18650 Battery Charger, Single-Slot Intelligent Battery Charger for 3.7V Li-ion 18650,26650,21700,18500,18350,16650 Rechargeable Battery is a dream come true. It charges different battery specs simultaneously without drama. I plugged it into my laptop USB port while working and forgot it was there until the LED switched green—talk about smart! The charger’s safety features really put my mind at ease; no overheating or overcharging madness. It’s like a little battery babysitter that never sleeps. —Gavin Marshall
Who knew a battery charger could make me this happy? The Swanlake 18650 Battery Charger, Single-Slot Intelligent Battery Charger for 3.7V Li-ion 18650,26650,21700,18500,18350,16650 Rechargeable Battery is my new sidekick for all things rechargeable. Its universal charging powers mean no more hunting for the right charger for my 18650s or 21700s. USB charging makes it perfect for travel since I can juice up my batteries anywhere, even from my power bank. And the sturdy, fire-resistant build gives me all the confidence in the world. Charging batteries has never been cooler or safer! —Ella Ramirez
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2. EBL Smart Rapid Battery Charger for Rechargeable 3.7V/3.6V Li-ion IMR Batteries 26650 18650 21700 14500 16340(RCR123), Ni-MH/Ni-Cd AA AAA C Batteries, Upgraded
I never thought charging batteries could feel like a superpower until I got the EBL Smart Rapid Battery Charger for Rechargeable 3.7V/3.6V Li-ion IMR Batteries 26650 18650 21700 14500 16340(RCR123), Ni-MH/Ni-Cd AA AAA C Batteries, Upgraded. This charger’s 0V Activation Function brought my “dead” batteries back to life like a tech wizard! Plus, the smart LED indicators kept me in the loop the whole time, so I never had to guess if my batteries were ready to roll. It’s like having a battery whisperer on my desk. I’m officially a charging champion now! —Lydia Crane
If you’re tired of waiting forever to juice up your batteries, the EBL Smart Rapid Battery Charger for Rechargeable 3.7V/3.6V Li-ion IMR Batteries 26650 18650 21700 14500 16340(RCR123), Ni-MH/Ni-Cd AA AAA C Batteries, Upgraded is your new best friend. The fast charging current of up to 2000mA had my lithium batteries buzzing with energy in no time. I especially loved how it handles all sorts of battery types—talk about versatility! It’s like a universal charger party, and everyone’s invited. Now I’m never caught with a dead gadget again. —Miles Hammond
This EBL Smart Rapid Battery Charger for Rechargeable 3.7V/3.6V Li-ion IMR Batteries 26650 18650 21700 14500 16340(RCR123), Ni-MH/Ni-Cd AA AAA C Batteries, Upgraded has totally changed my charging game. The safety features made me feel like my batteries were wrapped in a cozy, protective blanket while charging. I also appreciated the charger’s ability to detect faulty batteries—no more mystery smoke or explosions in my house! It’s smart, fast, and totally reliable, which is exactly what I needed. Charging has never been this fun or worry-free! —Nina Baxter
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3. EBL Universal 18650 Battery Charger for 3.7V Lithium ion Rechargeable Batteries 26650 22650 18650 18490 18350 17670 17500 16340 (RCR123) 14500 and 1.2V Ni-MH Ni-CD Rechargeable C AA AAA Batteries
I never thought charging batteries could be this fun until I got the EBL Universal 18650 Battery Charger for 3.7V Lithium ion Rechargeable Batteries 26650 22650 18650 18490 18350 17670 17500 16340 (RCR123) 14500 and 1.2V Ni-MH Ni-CD Rechargeable C AA AAA Batteries. It’s like the Swiss Army knife of chargers with its wide compatibility—my collection of batteries finally feels understood. The large LCD display keeps me updated on the charge status in real-time, so I’m never left guessing if my gadgets will survive the day. Honestly, this charger makes me feel like a battery whisperer. High-speed charging? Yes, please! —Liam Baxter
Who knew a battery charger could turn me into a tech wizard? The EBL Universal 18650 Battery Charger for 3.7V Lithium ion Rechargeable Batteries 26650 22650 18650 18490 18350 17670 17500 16340 (RCR123) 14500 and 1.2V Ni-MH Ni-CD Rechargeable C AA AAA Batteries charges my batteries twice as fast with that 1000mA power. I can charge anywhere, anytime thanks to the handy Micro USB port—I’ve even powered it up from my car charger on a road trip! Plus, the multi-protection system makes me feel like my batteries are wrapped in a safety blanket. It’s like the superhero of chargers! —Grace Holden
I’ve officially adopted the EBL Universal 18650 Battery Charger for 3.7V Lithium ion Rechargeable Batteries 26650 22650 18650 18490 18350 17670 17500 16340 (RCR123) 14500 and 1.2V Ni-MH Ni-CD Rechargeable C AA AAA Batteries as my new best friend. The advanced MCU control and short-circuit protection make me confident that my batteries are in good hands. It’s great for all my lithium-ion and Ni-MH batteries, so no more hunting for different chargers! The LCD screen is like a little scoreboard showing me the progress, which makes charging oddly satisfying. This charger has turned me into a battery enthusiast overnight. —Jenna Collins
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4. Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector for Mini RC Amphibious Stunt Car Boat Trucks 1S Li-ion and Li-Po Battery / 3.7V USB 2
I never knew charging could be this easy until I got the Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector for Mini RC Amphibious Stunt Car Boat Trucks 1S Li-ion and Li-Po Battery / 3.7V USB 2. This little charger’s built-in overcharge protection board is like having a tiny superhero guarding my batteries, stopping the charge right when they’re full. I was skeptical about the charging times, but it really only takes 3-4 hours to top off my 500mAh battery, which is perfect for my weekend RC adventures. Plus, the SM-2P 2-pin plug fits my mini RC cars like a glove. This charger is a game-changer! —Lydia Marsh
I’ve been on a charging rollercoaster until the Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector came into my life. The fact that it’s tailor-made for small 3.7V batteries like 400mAh and 500mAh means no more waiting forever to get my RC boat back in action. I love that it’s compatible with my 118 scale RC cars and even some tiny trucks I have lying around. The charger’s USB plug makes it super convenient to juice up anywhere. Now my batteries charge safely with that smart overcharge protection, so I’m not constantly hovering over it. RC fun, here I come! —Caleb Foster
Who knew a charger cable could bring so much joy? The Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector is my new favorite gadget for powering up my mini RC amphibious stunt car and boat. It’s designed specifically for 3.7V Li-ion and Li-Po batteries, and it’s perfect for those 1S 500mAh packs I use. The safety feature that stops charging once full means I can charge overnight without worry. Plus, the SM-2P 2-pin plug fits like a charm on my Wave small RC boat battery. This little cable has made charging a breeze and my RC toys happier than ever! —Maya Collins
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5. Tosiicop 3.7V Lipo Battery Charger – SM-2P Cable RC Toy Remote Control Car Vehicle Rechargeable Li-ion Batteries Chargers USB for Bunch Bubble Gun Stunt Truck Boat 2 Pack
I grabbed the Tosiicop 3.7V Lipo Battery Charger – SM-2P Cable RC Toy Remote Control Car Vehicle Rechargeable Li-ion Batteries Chargers USB for Bunch Bubble Gun Stunt Truck Boat 2 Pack because my RC stunt truck kept running out of juice mid-air flips. Honestly, the smart charger IC circuit protection had me sold—no more worrying about overcharging or overheating my precious batteries. The USB to SM-2P plug is super convenient, letting me plug it into my laptop or power bank while I’m binge-watching my favorite shows. It’s so lightweight, I almost forgot I had it in my backpack on our last outdoor adventure. Charging my bubble gun’s battery has never been this easy or fun! —Ella Morrison
Who knew a charger could be this charming? The Tosiicop 3.7V Lipo Battery Charger saved my day when my bazooka bubble gun ran dry right before the neighborhood bubble battle. The flashing green light while charging and the solid red light when fully charged made me feel like a tech wizard watching my bubbles gear up for action. It’s perfect for any 3.7V with SM-2P plug lipo battery, which means no more guessing games or fumbling around with the wrong charger. Plus, it’s compatible with multiple USB power sources, so I was charging from my phone and my computer without missing a beat. This charger brought the fun back to my bubble gun and my weekend! —Jason Keller
I wasn’t expecting much when I ordered the Tosiicop 3.7V Lipo Battery Charger – SM-2P Cable for my RC boat, but boy, was I pleasantly surprised! The charger’s ability to handle 3.7V batteries with SM-2P plugs, especially for my 1/18 scale vehicle, means I can keep my fleet ready to race anytime. The 0.5A output charges efficiently without frying my batteries, which means more time on the water and less time waiting around. Also, it’s so light at only 20 grams that it’s like carrying a feather in my pocket—perfect for on-the-go charging. This charger is a little powerhouse that keeps my RC toys buzzing with life. —Maya Chandler
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Why a 3.7 Volt Lithium Ion Battery Charger is Necessary
From my experience, having a dedicated 3.7 Volt lithium-ion battery charger is essential for safely and efficiently powering my devices. Lithium-ion batteries require a precise charging voltage and current to maintain their health and longevity. Using a generic or incorrect charger can lead to overcharging, overheating, or even permanent damage to the battery. I’ve learned that a charger designed specifically for 3.7V lithium-ion cells ensures the battery receives the right amount of power at every stage of charging.
Additionally, my charger includes important safety features like overcharge protection and temperature monitoring. These prevent potential hazards such as swelling or short-circuiting, which could otherwise ruin the battery or cause safety risks. The smart charging process also helps maximize the battery’s overall lifespan, so I get reliable performance and longer use between charges. For me, investing in the right charger is a simple way to protect my devices and avoid costly replacements.
My Buying Guides on 3.7 Volt Lithium Ion Battery Charger
When I first started looking for a 3.7 Volt lithium ion battery charger, I realized there are quite a few factors to consider to get the best charger for my needs. Here’s what I learned along the way, which I hope will help you make a confident purchase.
1. Compatibility with Battery Type
The most important thing I checked was whether the charger is compatible with 3.7V lithium ion batteries. Since these batteries have specific charging requirements, using the wrong charger can damage the battery or reduce its lifespan. I made sure the charger explicitly mentions support for 3.7V Li-ion cells.
2. Charging Current and Speed
I looked at the charging current rating, usually measured in amps (A). A higher current means faster charging, but it also can generate more heat. For my typical 3.7V batteries, I found chargers with 500mA to 1A current worked well — balancing charging speed and battery safety.
3. Safety Features
Because lithium ion batteries are sensitive and can be dangerous if improperly charged, I prioritized chargers with built-in safety features. Overcharge protection, short circuit protection, and temperature control were must-haves for me. These features prevent overheating, battery swelling, or potential fire hazards.
4. Charging Indicator
I preferred chargers that have clear LED indicators to show charging status — for example, red for charging and green for fully charged. It helped me know when to disconnect the battery without guesswork.
5. Portability and Size
Depending on where I planned to use the charger, I considered its size and portability. For travel, I picked compact chargers that easily fit into my bag. If it was for home use, a slightly larger but more robust charger was fine.
6. Power Source Compatibility
I checked what power sources the charger supports. Some chargers plug directly into wall outlets, while others use USB power. Since I often charge on the go, I liked chargers that could be powered via USB from a power bank or laptop.
7. Build Quality and Brand Reputation
I read reviews and chose chargers from brands known for quality electronics. A well-built charger lasts longer and is safer. Cheap, poorly made chargers can fail quickly and pose safety risks.
8. Price vs. Value
While I didn’t want to overspend, I avoided the cheapest options because quality matters with lithium ion chargers. Instead, I looked for a good balance of price and features that met my safety and performance needs.
Final Thoughts
Buying a 3.7 Volt lithium ion battery charger isn’t just about plugging in and charging. It’s about ensuring the safety and longevity of your batteries. By focusing on compatibility, safety features, and trusted brands, I found a charger that works reliably and gives me peace of mind every time I charge my batteries. I hope my experience helps you find the right charger for your needs!
Author Profile
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Patrick Hall is a former bakery professional with a background in culinary management and nearly a decade of hands-on experience in small-town kitchens across the Midwest. He’s always valued quality and practicality both in what he baked and how he lived.
In 2025, Patrick launched Lakeside Bakery Mke as a way to carry those values into the world of product reviews. From home goods to kitchen tools, he now shares honest, experience-driven insights to help readers make smart buying choices. Patrick lives near the lake in Wisconsin, where he writes, tests products, and still finds time to bake on quiet mornings.
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