Vapcell 21700 S41 4100mAh

Description - Vapcell 21700 S41 4100mAh

The Vapcell S41 is a high-drain INR 21700 battery built for setups that demand serious, sustained power. The 21700 format is slightly larger than the common 18650, and it pays off in capacity: the S41 delivers 4100mAh typical alongside a 45A continuous discharge rating. Manufactured by Vapcell, a brand trusted by experienced vapers and electronics builders for consistent quality and genuine published ratings, this cell also supports quick charging up to 6A and maintains low internal resistance for reliable voltage delivery under heavy load.

It's aimed squarely at enthusiasts running high-wattage regulated mods, mechanical mods, or other high-drain devices where inconsistent output simply isn't acceptable. Order before 1:00 PM Monday to Friday for same-day dispatch, with next-day tracked delivery available across most UK postcodes.

Introducing the Vapcell S41 21700 Battery

Not every 21700 cell lives up to its headline numbers in real-world use. The S41 earns its reputation because Vapcell's quality control is tight: the typical capacity of 4100mAh sits above a guaranteed minimum of 4000mAh, and the 45A CDR is a genuine continuous rating rather than a burst figure dressed up as a sustained one.

The cell uses INR chemistry (lithium nickel manganese cobalt oxide), which prioritises high discharge capability and thermal stability over raw energy density alone. That chemistry choice matters at high wattages, where thermal behaviour under sustained load separates reliable cells from ones that sag or degrade quickly.

Internal resistance is rated at a maximum of 5mΩ (measured at AC 1kHz). In practice, that means brisk ramp-up, stable output under sustained load, and less heat generated per unit of current drawn. The S41 is rated for 500+ charge cycles while retaining at least 70% of its original capacity, making it a genuinely long-term investment for a high-use build.

Why Choose the Vapcell S41 21700 Battery?

• Cell format: INR 21700, the larger, higher-capacity successor to the 18650 format, supported by a growing range of regulated and mechanical mods
• Capacity: 4100mAh typical (minimum 4000mAh), delivering longer runtimes between charges compared to standard 18650 cells
• Continuous discharge rating (CDR): 45A, with pulse capability up to 70A at 60°C thermal cut-off, handling high-wattage draws without voltage sag
• In vaping terms: 45A CDR comfortably supports high-wattage builds running in the 80-150W+ range on regulated mods, and suits demanding mechanical mod builds well
• Quick charge: Up to 6A fast charge, requiring a compatible high-current Li-ion charger, which cuts downtime significantly versus standard 3A charging
• Temperature tolerance: Discharge from -20°C to 70°C, charge from 0°C to 45°C
• Low internal resistance: Max 5mΩ for clean, consistent voltage delivery under sustained load
• Cycle life: 500+ charge cycles at 8C discharge rate, retaining at least 70% of original capacity
• Nominal voltage: 3.6V, charging to 4.20V with a 2.50V discharge cut-off
• Weight: Maximum 72g per cell

The S41's headline numbers are strong. What sets it apart from lesser cells is that those numbers hold up consistently across hundreds of cycles, not just on the first charge.

Compatibility and Performance

The Vapcell S41 4100mAh 21700 is compatible with any regulated mod, mechanical mod, or high-drain device designed for the 21700 cell format. Before ordering, check your mod's specification sheet to confirm 21700 compatibility, as some devices only accept 18650 cells.

For multi-battery mods: the S41 works in dual or quad configurations, but cell matching is non-negotiable. Always use cells from the same brand, same model, and same batch, kept on an identical charge cycle from new. Mixing a new S41 with a partially used cell creates an imbalance that accelerates wear on both cells and undermines the safety margins your mod is designed around.

Charger selection matters too. To take advantage of the 6A quick charge, you need a charger rated for high-current Li-ion charging in the 21700 format. Browse our 21700 battery chargers to find a compatible option. Any quality Li-ion charger will handle standard 3A charging, just without the fast-charge benefit. The S41 follows a CCCV (constant current, constant voltage) charging protocol to 4.20V with a 100mA cut-off for optimal cell health.

In vaping use, the S41's high CDR makes it appropriate for sub-ohm tanks and RDAs running at higher wattages. Explore our sub-ohm tanks and RDA range for compatible atomisers. For storage, keep cells between -5°C and 35°C. If you're storing for an extended period, hold the charge at approximately 3.5-3.7V rather than fully charged: Li-ion cells stored at full charge lose capacity faster over time.

Vapcell S41 21700 Highlights

The S41 stands out in the 21700 market because it combines high capacity with genuinely high continuous discharge in a well-built, tight-tolerance cell. These aren't aspirational figures from a manufacturer data sheet with no quality control to back them up. Vapcell tests consistently, and the cell you receive performs to the numbers on the label.

• 4100mAh capacity (min 4000mAh) for extended runtimes between charges
• 45A continuous discharge for high-wattage and mechanical mod use
• Up to 70A pulse with thermal cut-off protection at 60°C
• 6A quick charge support to reduce downtime between sessions
• 500+ cycle life at 70% capacity retention at 8C discharge rate
• Max 5mΩ internal resistance for clean, consistent voltage delivery
• Wide operating range from -20°C to 70°C discharge
• Dimensions: 21.5mm x 70.5mm, max weight 72g

Pair the spec sheet against what your build actually demands at peak wattage, and it becomes clear why the S41 is a go-to choice for vapers who've outgrown lower-rated cells.

Box Contents

• 1 x Vapcell S41 21700 Battery (Red)

No charger is included. A compatible Li-ion charger is required to use this cell. Browse our 21700 battery chargers or explore the full chargers range for compatible options. A protective carry case is also strongly recommended for safe transport and storage. Never carry loose cells in a pocket or bag alongside metal objects.

Vaping 101 stocks a full range of Vapcell batteries and 21700 cells alongside compatible chargers and accessories. Order before 1:00 PM Monday to Friday for same-day dispatch, with next-day tracked delivery to most UK postcodes via DPD. Standard delivery is free on orders over £50, and returns are accepted within 14 days of receipt on unused, undamaged items.