-
Save £6.00
Vendor:GolisiGolisi G25 18650 2500mAh Battery
Regular price £7.99Regular price£13.99-£6.00 Sale price £7.99 -
Save £4.00
Vendor:NitecoreI4 Battery Charger By Nitecore
Regular price £21.95Regular price£25.95-£4.00 Sale price £21.95 -
Save £4.46
Vendor:EfestEfest LUSH Box Vape Battery Charger
Regular price £14.49Regular price£18.95-£4.46 Sale price £14.49 -
Save £2.00
Vendor:NitecoreI2 Battery Charger By Nitecore
Regular price £17.95Regular price£19.95-£2.00 Sale price £17.95
If you vape on a box mod or an unregulated device, you already know that your battery is basically the heart of your setup. Get the wrong one and you could be dealing with short battery life, a mod that won't fire properly, or worse — a safety risk. Get the right one and you barely think about it again.
This guide from Vape Online Store is here to help you understand what actually matters when picking a vape battery or charger, so you can shop with confidence instead of just guessing.
First Things First — What Do Those Numbers Actually Mean?
Every vape battery has a string of numbers on it and honestly it can look like a foreign language if nobody has explained it to you before. The first part, like 18650, 20700 or 21700, tells you the physical size of the battery. The first two digits are the diameter in millimetres and the next two are the length, so an 18650 is 18mm wide and 65mm long. The 0 at the end just means it's round.
Bigger is not automatically better here — it just means more room inside for capacity. A 21700 battery is physically larger than an 18650, so it usually holds more charge and can often handle higher continuous power draw, which is why you see them in bigger box mods more often than in slim pen style devices.
Understanding mAh, Voltage and Amp Rating
The mAh number tells you the capacity of the battery — basically how much charge it can store, which affects how long it lasts between charges. A higher mAh rating generally means longer vaping time before you need to recharge.
The amp rating, shown as something like 40A, tells you the maximum continuous current the battery can safely deliver. This one actually matters a lot for safety. If you are running a low resistance coil build that pulls a lot of current, you need a battery with a high enough amp rating to handle it, otherwise you risk overheating the battery, which is genuinely dangerous.
Here's a fun fact for you — most 18650 batteries used in vaping are actually repurposed or inspired by the same battery format used in laptops and power tools, and the format was originally developed by Panasonic back in the 1990s.
What's Inside This Collection?
- AWT 18650 2900mAh 40A Best All-Rounder
- AWT 18650 2400mAh 40A Budget-Friendly
- AWT IMR 18650 3000mAh 40A Pack of 2
- AWT 18650 3500mAh 35A Rainbow Pack of 2
- AWT 21700 4800mAh Big Battery Power
- AWT 20700 4200mAh 40A Medium Format
- Golisi G30 18650 3000mAh High Capacity
- Golisi S30 18650 3000mAh Premium Option
- Aspire K3 Battery Replacement 600mAh Built-In
- Al Fakher Crown Bar Mini 3K Battery Case
- Vape Battery Chargers U2, Slim K4, Slim K1 & More
1. AWT 18650 2900mAh 40A — Best All-Rounder
The AWT 18650 2900mAh 40A is a well-known name in the vaping world for high drain performance. The 40A rating makes this one suitable for most sub-ohm box mod setups, and the 2900mAh capacity gives you a solid balance between runtime and power delivery.
Who's it for? Everyday vapers who want a dependable battery that works with most sub-ohm builds. It holds a five-star rating from customers for good reason.
What's in the box? 1× AWT 18650 2900mAh 40A battery.
- Size: 18650
- Capacity: 2900mAh
- Max Discharge: 40A
- Voltage: 3.7V
- Chemistry: Li-ion
- Rating: ⭐⭐⭐⭐⭐
2. AWT 18650 2400mAh 40A — Budget-Friendly
The AWT 18650 2400mAh 40A is a budget-friendly option that still carries that same 40A continuous discharge rating, just with a slightly smaller capacity.
Who's it for? Vapers who charge often anyway and don't need the extra runtime. A fair trade-off if you're looking to save a few pounds without compromising on safety.
What's in the box? 1× AWT 18650 2400mAh 40A battery.
- Size: 18650
- Capacity: 2400mAh
- Max Discharge: 40A
- Voltage: 3.7V
- Chemistry: Li-ion
3. AWT IMR 18650 3000mAh 40A — Pack of 2
The AWT IMR 18650 3000mAh 40A pack gives you a matched pair straight out of the box, which is exactly what you want for a dual battery device.
Who's it for? Vapers using dual battery mods who need matched cells for even discharge. Also great for single battery users who want a spare ready to go.
What's in the box? 2× AWT IMR 18650 3000mAh 40A batteries.
- Size: 18650 (Pack of 2)
- Capacity: 3000mAh each
- Max Discharge: 40A
- Voltage: 3.7V
- Chemistry: IMR (Li-Mn)
- Rating: ⭐⭐⭐⭐⭐
4. AWT 18650 3500mAh 35A Rainbow — Pack of 2
The AWT 18650 3500mAh 35A Rainbow pack offers a bit more capacity if longer battery life between charges matters more to you than the amp rating. The rainbow finish looks great too.
Who's it for? Vapers who prioritise longer runtime over maximum amp draw. The 35A rating is still plenty for most setups, and the 3500mAh capacity means fewer charges.
What's in the box? 2× AWT 18650 3500mAh 35A batteries (Rainbow finish).
- Size: 18650 (Pack of 2)
- Capacity: 3500mAh each
- Max Discharge: 35A
- Voltage: 3.7V
- Chemistry: Li-ion
- Rating: ⭐⭐⭐⭐⭐
5. AWT 21700 4800mAh — Big Battery Power
The AWT 21700 4800mAh is a larger format battery designed for mods that take 21700 cells. It offers a solid jump in capacity compared to the standard 18650 size.
Who's it for? Vapers using 21700-compatible mods who want maximum runtime and power. The larger format suits bigger box mods and cloud chasing setups.
What's in the box? 2× AWT 21700 4800mAh battery.
- Size: 21700
- Capacity: 4800mAh
- Voltage: 3.7V
- Chemistry: Li-ion
6. AWT 20700 4200mAh 40A — Medium Format
The AWT 20700 4200mAh 40A sits between the 18650 and 21700 in size, offering a solid jump in capacity compared to the standard 18650 size.
Who's it for? Vapers using 20700-compatible mods who want a balance between size and performance. The 40A rating makes it suitable for most sub-ohm builds.
What's in the box? 1× AWT 20700 4200mAh 40A battery.
- Size: 20700
- Capacity: 4200mAh
- Max Discharge: 40A
- Chemistry: Li-Mn
- Voltage: 3.7V
7. Golisi G30 18650 3000mAh — High Capacity
The Golisi G30 18650 3000mAh is a respected name when it comes to high drain 18650 cells. It holds a five-star rating and offers a genuinely big saving of £6.
Who's it for? Vapers who want a trusted brand with a solid capacity without stretching their budget too far. Golisi is known for reliable performance.
What's in the box? 1× Golisi G30 18650 3000mAh battery.
- Size: 18650
- Capacity: 3000mAh
- Voltage: 3.7V
- Rating: ⭐⭐⭐⭐⭐
8. Golisi S30 18650 3000mAh — Premium Option
The Golisi S30 18650 3000mAh is another solid pick from Golisi. With a £6 saving, it offers excellent value for a premium high-drain cell.
Who's it for? Vapers who want a premium Golisi cell with a higher price point but trusted performance. Great for those who know exactly what they want.
What's in the box? 1× Golisi S30 18650 3000mAh battery.
- Size: 18650
- Capacity: 3000mAh
- Voltage: 3.7V
- Chemistry: Li-ion
9. Aspire K3 Battery Replacement 600mAh — Built-In
The Aspire K3 Battery Replacement 600mAh is a built-in style battery unit designed for compatible Aspire pen devices. The smaller 600mAh capacity reflects that it is built for a slim, low power vape pen rather than a high wattage box mod.
Who's it for? Aspire K3 device owners who need a replacement battery for their pen-style device. Not for box mods or high-wattage setups.
What's in the box? 1× Aspire K3 Battery Replacement 600mAh (Pink).
- Device: Aspire K3
- Capacity: 600mAh
- Type: Built-in battery unit
- Colour: Pink
10. Al Fakher Crown Bar Mini 3K Battery Case
The Al Fakher Crown Bar Mini 3K Battery Case is designed as a compact rechargeable case rather than a swappable cell. It's a handy option if you use disposable style pod systems and want a bit more flexibility.
Who's it for? Users of Al Fakher Crown Bar Mini 3K devices who want a replacement or spare battery case.
What's in the box? 1× Al Fakher Crown Bar Mini 3K Battery Case.
- Device: Al Fakher Crown Bar Mini 3K
- Type: Rechargeable battery case
- Features: Compact, rechargeable
Vape Battery Chargers — Complete Range
A lot of vapers focus all their attention on the battery itself and completely forget about the charger, but honestly your charger has just as much impact on battery health and safety. A good charger monitors voltage properly, cuts off automatically once the battery is full, and often lets you charge multiple cells independently at their own pace.
Cheap or uncertified chargers are one of the most common causes of vape battery incidents, so this is genuinely not an area to cut corners on. Always look for a charger from a recognised brand with proper safety certifications.
Available Chargers at VOS
- U2 Charger By Vapcell — £9.95 (was £11.95) — Simple two-bay charging setup
- P2 Charger By Vapcell — £9.95 (was £11.95) — Two-bay charger
- Q2S Charger By Vapcell — £6.95 (was £7.95) — Budget two-bay
- Q1 Charger By Vapcell — £3.95 (was £4.95) — Single-bay, compact
- Slim K4 Vape Battery Charger By Efest — £13.95 (was £15.95) — Screen display
- Slim K1 USB Vape Battery Charger By Efest — £8.95 (was £9.95) — USB-powered, travel-friendly
Why Buy a Proper Charger?
- Faster charging than USB ports on mods
- Even charging — charges multiple cells independently
- Auto cut-off — stops charging when full to prevent overcharging
- Charge spares while still vaping on your device
Quick Comparison: Which Battery Is Right for You?
| Product | Size | Capacity | Max Discharge | Price | Best For |
|---|---|---|---|---|---|
| AWT 18650 2900mAh 40A | 18650 | 2900mAh | 40A | £5.99 | All-rounder |
| AWT 18650 2400mAh 40A | 18650 | 2400mAh | 40A | £4.59 | Budget |
| AWT IMR 18650 3000mAh 40A | 18650 (2pk) | 3000mAh | 40A | £12.99 | Dual battery mods |
| AWT 18650 3500mAh 35A | 18650 (2pk) | 3500mAh | 35A | £8.99 | Long runtime |
| AWT 21700 4800mAh | 21700 | 4800mAh | — | £8.99 | 21700 mods |
| AWT 20700 4200mAh 40A | 20700 | 4200mAh | 40A | £10.99 | 20700 mods |
| Golisi G30 18650 3000mAh | 18650 | 3000mAh | — | £7.99 | Trusted brand |
| Golisi S30 18650 3000mAh | 18650 | 3000mAh | — | £10.99 | Premium option |
Battery Safety Rules Every Vaper Should Actually Follow
- Never carry loose batteries in your pocket or bag without a proper case — metal objects like coins or keys can short the terminals
- Always use a battery case or sleeve and check the plastic wrap regularly for tears — a damaged wrap is a genuine fire risk
- Don't fully drain your battery to zero every single time — this puts extra stress on the cell over time
- Avoid heat — don't leave batteries in direct sunlight, a hot car, or anywhere temperature gets extreme
- Never mix batteries of different ages, brands or charge levels in a dual battery device — always replace both as a matched pair
- Check your device manual for recommended battery specs — every device is different
- If your battery feels warm just sitting in the mod, or the wrapping is torn, it's time for a fresh one
How to Charge Your Batteries the Right Way
- Place your battery into the charger making sure the positive and negative ends line up correctly
- Choose a stable surface away from anything flammable — a table rather than a bed or sofa
- Don't leave it unattended — charge somewhere you can keep an eye on it
- Most decent chargers show a red light that switches to green once the battery is full
- Unplug it once it's done — don't leave it connected for hours afterwards
Frequently Asked Questions — Vape Batteries & Chargers
Can I use any 18650 battery in my vape mod?
Not really — you need to check the amp rating and mAh rating match what your mod and coil setup needs. A battery with too low an amp rating for your build can overheat or fail, so always check your device manual and pick a battery rated for high drain use if you are running sub-ohm coils.
How do I know when it is time to replace my vape battery?
If your battery feels warm just sitting in the mod, the wrapping is torn or peeling, it drains much faster than before, or your mod is giving you low voltage warnings way earlier than usual, it is time for a fresh one. Never keep using a battery once the wrap is damaged.
Is it safe to charge vape batteries overnight?
It is best avoided. Lithium batteries can overheat if left on charge for too long past being full, even with built in safety features. A smart charger with auto cut-off is much safer than charging inside your mod overnight, so always keep an eye on charging where you can.
What is the difference between an 18650, 20700 and 21700 battery?
These numbers describe the size of the battery in millimetres — the first two digits are diameter and the next two are length. Bigger batteries like the 20700 and 21700 generally hold more capacity and can handle higher power draws, which suits bigger box mods and cloud chasing setups.
Do I really need a separate charger or can I just use the USB port on my mod?
A separate charger charges your batteries faster and more evenly, and lets you charge spares while still vaping on your device. Built in USB charging is fine occasionally but a proper external charger is much better for battery health long term.
What does mAh mean on a vape battery?
mAh stands for milliampere-hours — it tells you the capacity of the battery, basically how much charge it can store. A higher mAh rating generally means longer vaping time before you need to recharge.
What does the amp rating mean on a vape battery?
The amp rating tells you the maximum continuous current the battery can safely deliver. If you are running a low resistance coil build that pulls a lot of current, you need a battery with a high enough amp rating to handle it, otherwise you risk overheating the battery.
Can I mix different brands of batteries in a dual battery mod?
No — never mix batteries of different brands, ages, or charge levels in a dual battery device. Always use a matched pair (same brand, same age, same charge level) and replace both at the same time. This prevents uneven discharge and extra strain on one cell.
Why do my batteries drain so fast?
If your batteries are draining faster than usual, it could be because they are old and need replacing, you are vaping at a higher wattage than before, or the batteries don't have enough capacity for your usage. Check your device manual and consider upgrading to a higher capacity battery.
Are these batteries genuine and authentic?
Yes, absolutely. Vape Online Store sources every product directly from authorised UK distributors. We never sell counterfeit or grey-market goods. All batteries are fully TPD compliant and UK legal.
Ready to Power Up? Choose Your Vape Battery & Charger Today
Picking the right vape battery and charger does not need to be complicated once you understand what the numbers actually mean and what to look out for. Whether you need a high drain cell for a sub-ohm build, a matched pair for your dual battery mod, or a reliable charger that will look after your batteries properly, VapeOnlineStore.co.uk has trusted brands like AWT, Golisi, Efest, Nitecore and Vapcell ready to go.
Take a look through the full Vape Batteries and Chargers range, match the specs to your own device, and give your setup the reliable power source it actually deserves. A good battery and a proper charger are honestly one of the best small upgrades you can make to how your whole vaping experience feels day to day.
✅ TPD Compliant: All products in this collection are fully compliant with UK regulations.
We believe vaping is more than a habit — it’s a personal experience. That’s why we offer only the highest-quality devices and e-liquids, carefully selected to match every taste and lifestyle. Whether you're new to vaping or a seasoned cloud chaser, our mission is to deliver satisfaction, flavour, and convenience right to your door — safely, swiftly, and reliably."