Category: News

If you’ve ever used a flashlight, power tool, vape, or built your own DIY battery pack, you’ve probably heard of 18650 batteries.
When browsing online, you might notice two common versions — button top and flat top. At first glance, they look nearly identical, but that tiny difference at the top actually matters quite a lot.

So, what exactly is an 18650 button top battery, how is it different from a flat top one, and which type should you buy? Let’s break it down in simple terms.

1. What Does “18650” Mean?

“18650” isn’t a model number — it’s a size code.
It simply means:

• 18 mm in diameter
• 65 mm in length
• The “0” at the end indicates a cylindrical shape

Because of their high energy density and long lifespan, 18650 lithium batteries have become a universal power source — used in laptops, e-bikes, drones, flashlights, power banks, and even small solar storage systems.

2. What Is a Button Top Battery?

A button top 18650 battery has a small raised “button” on its positive end.
This little bump isn’t decorative — it’s there to make better contact with devices that have deeper battery compartments or flat contact plates.

Some devices (like flashlights or older electronics) may not work properly with flat top batteries because the positive end doesn’t quite reach the contact point.
In that case, the extra millimeter or two from a button top makes all the difference.

3. Button Top vs Flat Top: What’s the Difference?

In short: Button tops are for single-cell use; flat tops are for battery packs.

4. Why Some Devices Require a Button Top

Not every product is designed the same.
Some battery compartments include a protective ring around the positive contact to prevent reverse polarity. That means a flat battery might not touch the terminal at all — and your device simply won’t turn on.

A button top fixes that by providing a taller contact point.

Also, devices with loose springs or deeper chambers tend to perform more reliably with button top batteries. On the flip side, ultra-compact designs that leave no space to spare may only fit flat tops.

5. Is There a Performance Difference?

Not really.
The shape of the top doesn’t affect the performance — the chemistry and quality of the cell inside do.

Both button top and flat top 18650s can have the same capacity, discharge rate, and lifespan if made from the same grade of lithium cell.

The only small difference is that button tops are often welded on afterward. Poorly made welds could add a tiny bit of resistance, but for normal use, it’s negligible.

6. Practical Tips When Using Button Top Batteries

1. Check your device requirements.
   If the manual says “button top only,” don’t risk using a flat top — it might not make contact.
2. Use the same type in pairs or sets.
   When your device takes two or more batteries, make sure they’re the same type and length. Mixing button and flat tops can cause poor contact or uneven pressure.
3. Store and transport safely.
   Because the raised end is more exposed, a button top battery is slightly more prone to shorting if it touches metal objects. Always use a plastic case or insulation sleeve when carrying them.
4. Avoid DIY modifications.
   Some people stick magnets or metal shims on flat tops to “fake” a button top — this can fall off and short-circuit your device. Only do this if you absolutely know what you’re doing.

7. Quick Summary

• “18650” refers to the size, not a brand.
• “Button top” is just a contact design for better compatibility.
• There’s no power advantage between button and flat top versions.
• Always check your device specs before buying.

If you’re buying batteries for flashlights, tools, or plug-and-play devices — go with button tops.
If you’re building a custom pack or need to spot-weld connections — use flat tops instead.

1. What kinds of batteries do drones actually use?

Most UAVs (Unmanned Aerial Vehicles) run on Lithium Polymer (LiPo), Lithium-ion (Li-ion), or Lithium Iron Phosphate (LiFePO4) batteries. Some older or basic models may still use Nickel Metal Hydride (NiMH), but it’s becoming rare. The choice really depends on what the drone is built to do—speed, endurance, or stability.

2. Why are LiPo batteries everywhere in drones?

Because they hit the sweet spot between weight, power, and flexibility. LiPo packs are light and can deliver quick bursts of current, which is exactly what multi-rotor drones need for takeoff and maneuvering. You’ll find LiPo batteries in most consumer and racing drones.
The downside? They’re a bit temperamental—if you overcharge, puncture, or store them wrong, they can swell or overheat. So most UAV operators keep them under strict charging and storage routines.

3. How are Li-ion batteries different from LiPo ones?

Li-ion batteries last longer and hold more energy for their size. That means longer flights—but at a lower discharge rate. So, instead of racing drones, you’ll see Li-ion packs in survey, mapping, or fixed-wing UAVs that cruise for 1–2 hours. They’re also safer to handle and more durable across many charge cycles.

4. What’s the deal with LiFePO4 batteries?

These are the workhorses of the UAV battery world. LiFePO4 (Lithium Iron Phosphate) batteries don’t have the same energy density as LiPo or Li-ion, but they’re rock-solid in terms of safety and thermal stability. They can handle heat, rough conditions, and hundreds of cycles. That’s why they’re often used in industrial, agricultural, or military UAVs, where reliability matters more than long flight times.

5. Do any drones still use NiMH or lead-acid batteries?

Only the old-school or budget ones. NiMH and lead-acid batteries are heavy and inefficient compared to lithium-based types. You might find them in training drones, educational kits, or ground control systems, but not in modern UAVs meant for real work.

6. How much does battery choice affect flight performance?

A lot. The type of battery decides how far, how long, and how stable your UAV flies.

• LiPo: best for powerful takeoffs and fast maneuvers.
• Li-ion: ideal for long missions where energy efficiency is key.
• LiFePO4: perfect for harsh environments or long-term reliability.

In short, your battery isn’t just a power source—it’s part of the flight design.

7. Any new battery tech coming for UAVs?

Yes, and fast. Manufacturers are experimenting with high-voltage LiPos, graphene-enhanced cells, and solid-state lithium batteries that could double flight time and safety. For larger UAVs, hydrogen fuel cells and hybrid battery systems are also being tested to push endurance even further.

8. How can drone operators make their batteries last longer?

A few small habits go a long way:

• Don’t overcharge or fully drain the pack.
• Store batteries at around 50–60% charge when idle.
• Avoid extreme temperatures.
• Use a balancing charger to keep all cells equal.

Handled right, a good UAV battery can easily last over 300–400 charge cycles before noticeable drop-off.

Summary:

In today’s UAV market, LiPo and Li-ion batteries dominate because they strike the best balance between performance and weight. LiFePO4 is the go-to for industrial applications where safety and cycle life matter more. As battery tech keeps evolving, we’re getting closer to drones that can stay in the air for hours instead of minutes.

Electric bikes are everywhere these days, but the real headache for most riders isn’t the bike itself — it’s the battery. Maybe you bought a stock battery and realized it no longer meets your needs after a year, or you’ve run out of juice mid-ride and had to push your bike home. That’s why many riders are searching for custom ebike batteries.

Below, we’ll walk through the most common questions about custom electric bike batteries, explained in plain language.

1. What is a Custom Ebike Battery?

In short, it’s a battery built specifically for your needs.

Unlike generic factory packs, a custom ebike battery is designed around your frame, riding style, and energy demands. It could be long and slim, triangular, or even curved to fit into unusual spaces. Voltage and capacity are tailored to match your motor and controller, not just an off-the-shelf spec.

Think of it like clothing: some people wear “one-size-fits-all,” but if you go to a tailor, the fit is on another level.

2. Why Choose a Custom Ebike Battery?

Most people immediately think of “longer range,” but there are more reasons:

• Extended range: If your commute is 40 km but the standard battery only covers 25, you’re constantly worried. A custom pack can double the capacity.
• Stronger performance: After upgrading to a powerful motor, the stock battery often can’t deliver the current needed. A custom pack unlocks the motor’s full potential.
• Better space use: Folding frames and odd-sized bikes often can’t house factory batteries. Custom packs can be shaped to fit perfectly.
• Durability: With high-grade cells and a quality BMS (Battery Management System), lifespan can stretch from 2 years to 5+ years.

3. Can I Build My Own Custom Battery?

Yes, but it’s not as easy as it sounds. The process usually goes like this:

1. Design the specs – Decide on voltage (36V, 48V, 52V, or even 72V) and capacity (20Ah, 30Ah, etc.) based on your motor power and expected range.
2. Select cells – Common formats are 18650 or 21700 cylindrical cells. A pack might need dozens or even hundreds. Cell quality makes or breaks the battery.
3. Assembly – Spot weld the cells into parallel and series groups (e.g., 13S4P for 48V). Poor welds can overheat or short.
4. Install the BMS – This “brain” balances voltages and protects against overcharge, over-discharge, and short circuits.
5. Enclosure and finishing – Add insulation, put everything into a case, and seal it against water and vibration.

It sounds straightforward, but mistakes are costly. Cells can overheat during welding, a mismatched BMS won’t function, and safety risks are real. DIY is possible for experienced builders, but most riders are safer leaving it to professionals.

4. What Key Specs Should I Know?

When talking to a builder or supplier, expect these terms to come up:

• Voltage (V) – Determines motor power. 36V is entry-level, 48V/52V is common, and 72V is for high-performance builds.
• Capacity (Ah) – Think of it as fuel tank size. 15Ah works for daily commuting; 30Ah+ is for long-distance trips.
• Cell type – Higher-grade cells last longer and run cooler.
• Shape – Packs can be rectangular, triangular, split, or even curved, depending on your frame.
• Connectors & BMS – Critical for safe charging and discharge.

5. Is a Custom Battery More Expensive?

Yes, usually. Reasons include:

• One-off design and hand assembly instead of mass production.
• Extra testing and sometimes custom cases.

But consider this: a cheap stock battery might die in 2 years, while a custom pack can last 5. Over time, it can actually be more cost-effective.

6. What Should I Watch Out for When Using a Custom Ebike Battery?

• Use the right charger – Never swap chargers from other packs.
• Store at partial charge – If unused, keep the battery at 40–60% rather than empty.
• Avoid extreme temps – Don’t charge under the sun or in sub-zero weather.
• Check regularly – Look for loose connectors, swelling cases, or strange smells. If anything seems off, stop using it immediately.

7. Who Really Needs a Custom Ebike Battery?

• Long-distance riders – Touring cyclists who need 100+ km per charge.
• Delivery riders – Couriers who can’t afford downtime.
• Performance enthusiasts – Builders who push motors and controllers beyond factory limits.
• Unique frame owners – Folding or niche frames that can’t fit a standard pack.

8. Where Can You Get One?

Three main routes:

1. Professional builders or factories – Best for reliability and safety.
2. Bike shops with modification services – Some offer install and fitment.
3. DIY communities – Forums and maker groups, if you want to learn and experiment.

Final Thoughts

A custom ebike battery isn’t a luxury — it’s a solution.

It frees you from the limits of “standard packs” and lets your bike fit your life. If you just ride short commutes, stock batteries are fine. But if you need more range, power, or special fitment, a custom battery is the way forward.

The only decision is: do you trust your own technical skills enough to DIY, or do you want to hand the job to someone experienced?

As wearable electronics get smaller and more ergonomic, traditional square or cylindrical batteries often just don’t fit. That’s where curved batteries come in. Their arc-shaped design allows engineers to make the most of limited space, hiding the battery inside rings, bracelets, or wrist-worn smart devices. Here’s a FAQ guide for anyone looking to source these batteries.

1. What is a Curved Battery?

In simple terms, it’s a lithium polymer (LiPo) battery designed with a specific curvature from the start. Unlike flexible batteries that bend like a rubber band, curved batteries are manufactured in a fixed arc shape. This allows them to fit snugly inside rings, wristbands, or curved device enclosures without wasting space.

2. What devices are they used in?

Curved batteries are primarily aimed at the wearable market:

• Smart rings
• Fitness trackers and smartwatches
• Miniature wearable sensors
• Medical-grade wearable devices

If your product is small enough to fit on a finger, standard batteries are either too thick or simply won’t fit. Curved batteries solve that problem perfectly.

3. What are typical specifications?

Wholesale buyers usually care about voltage, capacity, and dimensions. Typical specs include:

• Voltage: usually 3.7V, which is standard for LiPo cells.
• Capacity: ranges from 8mAh to 30mAh, with smart rings often needing around 10–20mAh.
• Dimensions: width, thickness, and curvature can be extremely small, e.g., 1.5mm thick models that fit inside smart rings.
• Cycle life: usually 300–500 charge/discharge cycles.
• Operating temperature: discharge -20°C to 60°C, charge 0°C to 45°C.

Though the numbers seem modest, they’re enough to power heart rate monitoring, Bluetooth, and other core features in miniature wearable devices.

4. Can they be customized?

Absolutely, and in most cases, customization is necessary.
Different rings and wristbands have different curves, so battery manufacturers typically design the battery to match your enclosure. Customization options include:

• Curvature (e.g., π/6, π/3, half-ring shapes)
• Dimensions (thickness, length, width)
• Capacity (based on device power requirements and desired battery life)
• Connector or soldering options

If you finalize your case design before talking to the battery supplier, you might end up with a battery that doesn’t fit—a costly mistake.

5. Which manufacturers offer these batteries?

Currently, several manufacturers specialize in curved LiPo batteries:

• Professional LiPo manufacturers capable of making ring and arc-shaped batteries.
• Wearable device suppliers who often co-develop batteries with smart ring and wristband manufacturers.

For example, ANPS and GMB offer specific models with very thin profiles (1.5mm) and capacities ranging from 8–25mAh, designed for smart rings.

6. What should wholesale buyers watch out for?

If you’re sourcing in bulk, keep these points in mind:

• MOQ (Minimum Order Quantity): Custom curved batteries often require orders of several thousand pieces.
• Consistency: Small-capacity batteries must maintain consistent voltage and capacity across batches.
• Certifications: CE, UL, UN38.3—especially important for export.
• Lead time: Custom batteries usually take 4–6 weeks to produce.

7. Who should consider these batteries?

• Wearable device manufacturers: Startups making smart rings or fitness bands.
• Medical device developers: Miniature devices that need small, lightweight batteries.
• Electronics design companies: OEM/ODM projects requiring specialized battery shapes.

If your device draws high current (like drones or power tools), curved batteries are not suitable. But for lightweight, small, body-conforming wearables, they’re almost indispensable.

Summary

Curved batteries may be small in capacity, but in the wearable sector, they’re invaluable. They’re not “general-purpose batteries” but highly customized solutions. Wholesale buyers should consider not only voltage and capacity but also enclosure curvature, manufacturer customization ability, and batch reliability.

Bottom line: If you’re making smart rings, wristbands, or body-conforming wearables, curved LiPo batteries are a must-have component.

In the drone world, batteries aren’t just a component—they’re basically the heart of the whole operation. For wholesale buyers, knowing the ins and outs of a 12V drone battery, how it works, and how to handle it properly can save a lot of headaches down the line. Here’s a friendly, easy-to-understand FAQ to help you make smart choices.

What Exactly is a 12V Drone Battery?

A 12V drone battery is mainly used for lightweight or mid-sized drones. The appeal? It’s compact, packs a punch, and doesn’t weigh your drone down. Perfect for things like agricultural drones, aerial photography, and even industrial inspections.

Basically, these batteries give you enough juice to keep the drone flying efficiently while keeping the craft light enough for smooth handling. Think of it like choosing a lightweight backpack for a long hike—you want enough storage without being weighed down.

Why You Can’t Ignore the BMS

The Battery Management System (BMS) is basically the battery’s brain. Without it, your battery is flying blind. Here’s why it matters:

• Voltage & Current Monitoring: Stops overcharging or draining too much, protecting the battery.
• Temperature Management: Keeps it from getting too hot or too cold—both are bad for performance.
• Performance Tweaks: Adjusts output depending on how hard your drone is working.

In short, a battery without a BMS is like driving a car without a dashboard—you have no clue what’s going on. For wholesalers, offering batteries with a solid BMS is a smart move because it cuts down on returns and complaints.

How Long Will a 12V Drone Battery Last in the Field?

Flight time varies. Here’s what affects it:

• Battery Size: Bigger batteries = longer flight.
• Payload & Spraying Load: Heavier loads drain the battery faster.
• Environment: Wind, temperature, and even terrain can mess with efficiency.

Some ballpark figures:

• Mid-sized agricultural drones (10–15L spray capacity) usually get 12–16 minutes per charge.
• Heavy-duty batteries can stretch that to 40–60 minutes when carrying lighter loads.

So, when picking batteries for your clients, it’s smart to match capacity to what they’ll actually use.

Charging Tips to Keep Your 12V Batteries Happy

Charging might seem basic, but it’s super important for battery life:

1. Stick to the Manufacturer’s Charger—no substitutes.
2. Check for Damage—don’t charge a swollen or leaking battery.
3. Charge Safely—pick a ventilated area, away from flammable stuff.
4. Avoid Overcharging—unplug once it’s full.
5. Keep an Eye on It—don’t just walk away; watch for anything unusual.

Following these simple steps will make your batteries last longer and keep things safe.

Buying Tips for Wholesale Customers

• Go for Batteries with a BMS—it’s worth it.
• Pick Capacity Based on Use—different drones need different power.
• Look at Cycle Life—good batteries handle around 1,000 charge cycles.
• Consider Protection—waterproof and corrosion-resistant batteries are better for outdoor use.

Wrapping It Up

A 12V drone battery is the unsung hero of any drone operation. For wholesalers, knowing the tech, picking the right models, and giving your clients clear guidance goes a long way in building trust and cutting down returns.

Pro Tip: Include a simple “Battery FAQ” sheet with your products. It helps users understand BMS, charging tips, and flight times. Trust me, it makes life easier for both you and your clients.