Product Highlights
Battery Size 18650
The battery capacity is 3800mAh
The discharge is 10 Amp
The voltage is 3.6V
Price Match
Price Match Guarantee
Vaping 101 offers the lowest prices in the UK. We check our prices against trusted competitors to give you the best deal.
- Must be a genuine UK website that complies with UK law.
- Price must be public and not clearance or special promotion.
- Same product and in stock for same day dispatch.
Questions. Contact our support or fill in the form below.
Returns Policy
Returns and Cancellations
You may cancel online orders within 14 days. Items must be unopened and in original condition. Unwanted orders must be returned at your cost.
Hygiene Rules
E liquids, tanks, vape kits, coils and pods cannot be returned once opened (unless faulty).
Faulty Goods
If confirmed faulty, return postage up to three pounds is refunded.
Address or Delivery Issues
Parcels returned due to incorrect address or refusal incur carrier fees. Missing parcels can only be checked after ten working days.
Contact Us
Email info@vaping101.co.uk for help or call 01224 032542
- Description
- Reviews
- Delivery
Description - Fogstar Energy 3800 18650 10A 3800mha Battery
The Fogstar Energy FS3800 is a high-capacity 18650 lithium-ion cell built for vapers who need reliable, long-lasting power from a regulated box mod. Made by Fogstar, a trusted name in UK battery supply, the FS3800 delivers 3800mAh capacity alongside a 10A continuous discharge rate. That combination makes it a strong choice for single-battery mods running at low to moderate wattages. Its flat-top design ensures broad compatibility across a wide range of regulated devices, and it suits everyday vapers and experienced enthusiasts who know their hardware. Order before 1pm Monday to Friday for same-day dispatch, with next-day delivery available across most UK postcodes. A custom battery wrap is available at checkout for an added layer of protection.
Introducing the Fogstar Energy FS3800 18650 Battery
Most 18650 cells force a trade-off: high capacity or high discharge. The FS3800 sits at a sensible middle ground, prioritising runtime for vapers who use regulated mods at moderate wattages and want to get through a full day without reaching for a charger.
3800mAh is one of the highest capacities available in the 18650 format. Paired with a 10A continuous discharge rate, it delivers consistent power output without the stress of high-drain demands. If you vape at 30-60W on a single-battery regulated mod, this is a cell worth knowing about.
Fogstar has built a reputation as a legitimate UK battery specialist, and the FS3800 reflects that. UN38.3 and MSDS documentation is available on request, which reassures buyers who want to confirm they're purchasing a properly tested, compliant cell rather than a grey-market import.
Why Choose the Fogstar Energy FS3800?
- Cell type: 18650 lithium-ion, flat-top configuration
- Capacity: 3800mAh, providing extended runtime between charges compared to standard-capacity 18650 cells
- Continuous discharge rate: 10A, suited to low and medium-output regulated devices
- Nominal voltage: 3.6V, maximum charge voltage 4.2V
- Protection type: Non-protected cell. The cell itself has no built-in circuit. It is designed for use in regulated mods that provide their own safety management, including overcharge, over-discharge, and short-circuit protection
- Ideal device match: Single-battery regulated box mods operating at moderate wattages, generally up to 50-60W in practice. Not recommended for unregulated mechanical mods unless you have advanced knowledge of Ohm's law and battery safety
- Best for: Everyday vapers with regulated box mods who want fewer charges per day and consistent power delivery
- Cycle life: Approximately 200-500 full charge cycles before capacity begins to drop noticeably
- Compliance: UN38.3 and MSDS documentation available on request
The high capacity of this cell makes it particularly well suited to vapers who don't want to carry a spare battery or stop to charge mid-session.
Compatibility and Performance
Getting the most from the Fogstar Energy 3800 18650 Battery comes down to pairing it correctly with your device and looking after it properly.
Compatible devices include regulated box mods that take a single 18650 cell with flat-top compatibility. Always check your mod's manual to confirm it accepts flat-top cells before purchasing. This cell works well for MTL (mouth-to-lung) setups and low-wattage direct-lung configurations where power demand stays comfortably within the 10A discharge limit.
The FS3800 is not suited to devices that require button-top cells, dual-battery configurations expecting matched pairs, or unregulated mechanical mods in the hands of inexperienced users.
For charging, you need a dedicated lithium-ion charger rated for 18650 cells. Do not charge via a generic USB charger or leave batteries unattended while charging. Browse our 18650 battery chargers to find a compatible option.
Two practical habits extend this battery's usable life significantly:
- Inspect the wrap regularly. A damaged battery wrap exposes the cell casing and creates a short-circuit risk. Replace or rewrap immediately if the wrap shows any sign of peeling or tearing. A custom wrap is available as an optional add-on at checkout.
- Store it correctly. Keep the cell in a cool, dry place. Leaving a fully charged battery in high temperatures for extended periods accelerates capacity degradation and shortens the overall cycle life.
Choosing the right charger and maintaining the wrap in good condition are the two most practical things you can do to protect your device and push this cell toward the upper end of its 500-cycle lifespan.
Fogstar FS3800 Highlights
One of the highest-capacity 18650 cells available, the FS3800 is built for vapers who prioritise runtime and reliability above all else.
- 3800mAh capacity for extended vaping sessions between charges
- 10A continuous discharge for consistent, stable power delivery
- Flat-top design for broad compatibility with regulated box mods
- Non-protected cell built for use in devices with integrated safety circuits
- High-grade lithium-ion construction with documented compliance credentials
- 200-500 cycle life when charged and stored correctly
- Optional custom battery wrap available for added protection and personalisation
These specs combine to make the FS3800 a practical, dependable daily driver for vapers who know their setup and want a cell that simply does its job.
Box Contents
- 1 x Fogstar Energy 3800 18650 Battery
- Optional: Custom Battery Wrap (select design at checkout)
The Fogstar FS3800 is in stock now at Vaping 101, one of the UK's largest vaping retailers. Order before 1pm Monday to Friday for same-day dispatch, with next-day DPD delivery available to most UK postcodes. Free delivery applies to all orders over £50. We stock the full Fogstar range alongside a wide selection of 18650 batteries and compatible chargers, so you can put together a complete, well-matched setup in a single order.
Fogstar Energy 3800 18650 10A 3800mha Battery Reviews
Delivery Of Fogstar Energy 3800 18650 10A 3800mha Battery
- All orders are sent in discreet packaging.
- Delivery is free for all orders over £50. Otherwise, delivery is £3 to £12 depending on the service you plan to purchase.
- You can return your product up to 14 days after receiving your order. Please make sure that the products are not used or damaged.
UK Shipping
Service Overview: Reliable tracked delivery service.
Delivery Time: 2 to 4 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays and on Saturday.
- NOT GUARANTEED SERVICE
Cost: £3.00 (Free over £50)
Service Overview: Fast, door-to-door courier service.
Delivery Time: Next day for most UK postcodes. View postcode exclusions
Key Features:
- Full end-to-end tracking with live updates.
- Same-day dispatch Monday to Friday for orders placed before 1:00 PM (excluding Bank Holidays).
- Deliveries made on weekdays (some areas deliver Saturday).
- Signature required on delivery.
- Battery Restrictions: None: DPD imposes no additional restrictions on batteries.
- NOT GUARANTEED SERVICE
Cost: £3.50 (Free over £50)
Service Overview: Parcels are delivered to a nearby DPD Pickup Point or Drop-Point for customer collection.
Delivery Time: Next day for most UK postcodes. View postcode exclusions
Key Features:
- Notifications sent via email/SMS when parcel is ready for collection.
- No signature required—customer collects in person.
- Ideal if you’re not available at home for doorstep delivery.
- Battery Restrictions: None: DPD imposes no additional restrictions on batteries.
- NOT GUARANTEED SERVICE
Cost: £3.50 (Free over £50)
Service Overview: Reliable standard delivery service.
Delivery Time: 2 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
Cost: Price Based On Address
Service Overview: Faster tracked delivery service.
Delivery Time: Up to 1 to 2 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays and on Saturday.
- NOT GUARANTEED SERVICE
Cost: £4.00
Service Overview: A cost-effective express service for less time-sensitive deliveries.
Delivery Time: Next business day delivery by the end of the day to most UK destinations.
Key Features:
- Lower-cost option compared to UPS Express®.
- Includes tracking and proof of delivery.
- Suitable for urgent but not time-critical shipments.
Cost: Price Based On Address
Service Overview: Guaranteed next-day delivery service.
Delivery Time: Next day.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday for orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays and on Saturday.
Cost: £9.00
Service Overview: A time-definite delivery service for urgent shipments.
Delivery Time: Next business day delivery by 10:30 AM or 12:00 PM to most UK locations.
Key Features:
- Ideal for time-critical shipments.
- Includes tracking and proof of delivery.
- Money-back guarantee if the delivery commitment is not met.
Cost: Price Based On Address
International Shipping
Delivery Time: 3-10 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- NOT GUARANTEED SERVICE
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Weight + Address
Delivery Time: 3-10 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:30 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- NOT GUARANTEED SERVICE
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Weight + Address
Delivery Time: 2-4 working days.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: Next Business Day EU.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: Next Business Day EU By 10:30am.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: 2 Business Day.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Delivery Time: 1-2 Business Day.
Key Features:
- Tracked to delivery point.
- Same day dispatch Monday to Friday orders placed before 2:00 PM (excluding Bank Holidays).
- Deliveries are made weekdays.
- Delays caused by Customs are completely out with our control.
Cost: Price Based On Address
Fogstar Energy 3800 18650 10A 3800mha Battery FAQ
You may also like
New to vaping or you're not sure where to start?
Don’t worry vaping might seem a bit confusing at first, but it really doesn’t need to be. If you’re unsure where to start or just want things explained clearly, we’ve put together a set of simple guides to help you understand the basics. From choosing the right vape kit to looking after your vape and learning the different ways to vape, everything’s covered in plain language.
We also have helpful videos from our reviewer, Andrew, who walks you through each topic and products shows you exactly how it all works.
If you need any extra help, our friendly support team is here 7 days a week via live chat or give us a call on 01224 032542 and we’ll be happy to assist. You can also reach us through Contact Us.
Recently viewed
- Opens in a new window.