3500mah 18650 Rechargeable Battery | High Drain Vape Battery


42 in stock (can be backordered)

(3 customer reviews)

42 in stock (can be backordered)

This HG21 18650 battery is a 20A (high drain) 3500mAh (large capacity) rechargeable battery for your Nectar device or any other vaporizer with a replaceable battery. It can be used to upgrade the existing battery of your vaporizer or just act as a replacement battery.

  • High capacity and discharge current, low internal resistance, no memory effect, ready for loading and unloading.
  • Stable performance, continuous charge and discharge for 500 times, battery capacity is not less than 85% of rated capacity.
  • Use original program, intelligent protection circuit design, 15kg explosion-proof battery internal pressure valve automatically opens to prevent explosion.
  • PTC internal safety switch automatically disconnected when short circuit and other damage happens

To ensure you never run out of power check out the Nectar Dual 18650 battery charger which doubles up as a power bank for your vaporizer or any other device!


3500mah 18650 Rechargeable Battery

  • Any 18650 battery (Lithium-Ion cells) should be charged on a dedicated charger rated specifically for Lithium-Ion cells Our selection can be found by clicking on 18650 battery charger uk
  • Never leave a cell unattended whilst charging
  • Keep all batteries away from animals and children
  • Wraps and insulators should be periodically inspected for tears or damage. If a battery has a damaged wrap, it should be repaired or disposed of immediately
  • If you are re-selling these 18650 batteries, it is your duty to pass these warnings onto your customers
  • Batteries usually have a cycle life of between 200-500 cycles (varies with manufacturer) before noticeable capacity drop off. Batteries should be recycled at this time
  • Do not crush, incinerate or modify
  • Only use within manufacturers specification

Same day dispatch, 7 days a week, except on public holidays.


This large capacity 3500mah rechargeable 18650 battery can be used as a replacement battery for any product which accepts an 18650 battery, including torches and vapes such as our Nectar Gold dry herb vaporizer and our Nectar Platinum dry herb vape.

Why Nectar 18650 Batteries?

All our vape batteries are rechargeable, high-drain and offer a high capacity (3000mah or 3500mah). Just to be clear – ‘mah’ refers to milliampere/hour, which is a measurement of (electric) power over time. High-drain batteries are for power-hungry devices that need a constant supply of power.

High-drain Batteries

The 18650 rechargeable battery offers 3500mah which means it’s made for power-hungry devices that need a constant supply of power. These batteries hold higher voltages under a heavy load, and can put out more amperage than a non high-drain battery, this means you get the power when you need it. 

Rechargeable Batteries – What Are the Benefits?

Rechargeable batteries can be recharged with a simple battery charger and therefore produce less waste. It’s also more efficient for the planet because recharging batteries with a battery charger is more energy efficient than the cost and energy of making new batteries. Throw-away batteries have a further adverse effect on the environment as batteries end up in landfills (if not disposed of via recycling processes), resulting in dangerous chemicals such as lead, cadmium, lithium and even mercury being leached into the ground which then make their way into the water supply, and eventually the ocean. 

Rechargeable batteries also provide the convenience, control and flexibility around charging your vaporizer without your needing to purchase further batteries each time the battery charge runs out. After the initial outlay in purchasing a charger you can re-use your batteries over and over again, which is good for your purse and for the planet, and convenient. 

The Nectar Dual 18650 battery charger is not just a charger but a power bank, and you’ll get two 3500mah batteries. With this handy 18650 power bank, you’ll be able to charge your Nectar vaporizer as well as charge your 18650 batteries – this can be done either simultaneously or separately as you prefer, which makes it more convenient with less waiting time.

Can You Use Nectar 18650 Batteries with Non-Nectar Devices?

For sure! Nectar 18650 batteries are suitable for any device that accepts a 18650 rechargeable and replaceable battery. Our batteries are not just for our vaporizers! 

Which Batteries Do You Sell?

Here’s what we offer in terms of batteries:

18650 Battery 3000mah (x1 battery)

18650 Battery 3500mah (x1 battery)

18650 Batteries 3000mah (x2 batteries)

What Size Batteries Do Dry Herb Vaporizers Usually Need?

18650 Li-ion batteries are the most common battery for dry herb vaporizers. They’re  a bit larger than standard AA batteries – 18mm by 65mm. Want to know the difference between an 18650 battery and an AA battery? Read on…

Is an 18650 Battery the Same as an AA battery?

No, 18650 and AA batteries differ in size, voltage, current discharge and type. Here’s a summary of these differences.


An 18650 battery is a rechargeable lithium-ion battery, while an AA battery can be  made from a variety of different materials apart from lithium-ion, including zinc-carbon, alkaline, nickel-cadmium, nickel-metal hydride (NiMH).


18650 rechargeable Li-ion Batteries are larger in diameter and length than standard AA batteries. In fact, ‘18650’ gives the size of these batteries away – the “18” refers to the diameter of the battery in millimetres (18mm) and the “65” refers to the length (65mm). Makes sense!  However the name of AA batteries doesn’t give their size away, which is around 14.5mm by 50.5mm.


Typically, an 18650 battery has a higher voltage of 3.6V versus a lower voltage of around 1.5V for an AA battery.  

Discharge of Current

A standard AA alkaline or NiMH battery offers between 2000mah and 3000mah, whilst our 18650 batteries are 3000mah and 35000mah (so not that different). The difference however is that the 18650 battery discharges more current at any one time than an AA battery which draws only a few amps at any one time.


1-Year Warranty: 96% of people keep their Nectar device, but just in case we offer a 12 month limited warranty (extendable to 3 years at no charge), 14-day money back guarantee & 24/7 customer service. The warranty can be claimed for defects due to faulty workmanship or materials arising from normal use of the device. To claim, please contact us via email (info@NectarMedicalVapes.com) or WhatsApp (+44 7732 415 188). Moreover, if you just fancy a chat or would like more information then feel free to call us (+44 207 050 0737).

3 reviews for 3500mah 18650 Rechargeable Battery | High Drain Vape Battery

  1. Mr. Gerald Richmond

    Obviously, the batteries are only much good in the vape itself! But they are, and you should always have spares of anything that is essential ;-)

  2. Elfy Baker

    Item received promptly, packaging and product well made, great company communication, very happy :)

  3. Anthony

    Great company to deal with. Fast delivery and great advice when needed. Will use you again.

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