What size battery does my vape mod take?

Most box mods take 18650 or 21700 cells. Check the battery door or your mod's manual. If you're still unsure, bring it into our Caerphilly store and we'll check for you.

Can I use any 18650 battery in my vape?

You need a battery with a high enough continuous discharge rating (CDR) for your mod. Most vape mods need a battery rated at 20A or above. We only stock cells that meet this requirement.

Is it safe to charge vape batteries in the mod?

It's generally fine for occasional use, but a dedicated multi-bay charger is safer and better for battery health. It monitors each cell individually and stops charging when full.

How long do vape batteries last?

Most quality 18650 and 21700 cells last 300 to 500 charge cycles before capacity starts to drop noticeably. If your battery drains much faster than it used to, it's time to replace it.

Can I mix different batteries in a dual-battery mod?

No. Always use matched pairs from the same brand and batch in dual-battery mods. Mixing batteries with different capacities or charge levels can cause uneven discharge and is a safety risk.

What is the difference between 18650 and 21700 batteries?

21700 cells are physically larger and hold more charge than 18650s, so they last longer between charges. They only fit mods designed for the 21700 size, so check your device before buying.

Vape Batteries & Chargers UK

Replacement vape batteries and chargers for box mods and advanced kits. We stock 18650 and 21700 cells from trusted brands, plus multi-bay chargers that keep your batteries topped up safely. If you're not sure which battery fits your mod, the guide below will help.

✓TPD-Compliant Only →Free Delivery Over £21 ⏱Same-Day Dispatch Before 2pm ★Trusted Since 2015

Browse:

18650 Batteries 21700 Batteries Battery Chargers

Molicel P28A 18650 Battery

Sold out

Molicel P28A 18650 Battery

Molicel P28A 18650 Battery

£5.99

Sale price £5.99 Regular price
Molicel P42A 21700

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Molicel P42A 21700

Molicel P42A 21700

£8.99

Sale price £8.99 Regular price

Which Battery Do You Need?

Most box mods take either 18650 or 21700 cells. Check your mod's manual or the battery compartment door for the size. 18650 is the most common. 21700 cells are larger and hold more charge, so they last longer between charges, but they only fit mods designed for them. Never mix battery brands or capacities in a dual-battery mod.

Right for you if you have a dual-battery box mod and want longer sessions between charges.

Wrong for you if you use a pod kit or all-in-one device. Those have built-in batteries that you charge via USB.

Battery Safety — What You Need to Know

Always buy batteries from a reputable source. Counterfeit cells are a real risk and can be dangerous. Never charge batteries unattended or overnight. Use a dedicated multi-bay charger rather than charging through your mod where possible, because a proper charger monitors each cell individually. Wrap damaged batteries before disposing of them at a battery recycling point.

Right for you if you want the safest, most controlled charging setup for your advanced kit.

Wrong for you if you want a simple, low-maintenance setup. A pod kit with USB-C charging is a much easier option.

The Vape House has stocked vape batteries and chargers since 2015, and we only sell cells we trust. If you're running a dual-battery mod, getting the right battery matters more than most people realise. The wrong cell can underperform or, in rare cases with counterfeit batteries, cause problems. We stock genuine 18650 and 21700 batteries from brands with a proven track record, alongside multi-bay chargers that balance-charge each cell individually.

For everything else your kit needs, browse our full vape accessories range, including replacement coils and vape tanks. Free tracked delivery on orders over £21. Same-day dispatch on orders placed before 2pm Monday to Saturday.