The first time I built a 21700 battery pack for a long-range night hike, I made the mistake of thinking all 21700s with the same mAh label would perform the same. I grabbed a pair of 4000mAh cells rated for 30A continuous and a pair of 5000mAh cells rated for 10A, mixed them in the same 2S2P pack, and expected a smooth 9000mAh of combined capacity. What I got was a pack that tripped the BMS every time I tried to pull more than 10A, because the 4000mAh cells were trying to carry the entire load while the 5000mAh cells sagged and fought back. That evening taught me that capacity numbers alone are meaningless without the context of discharge ratings, internal resistance, and chemistry — and that a “tier list” for 21700 cells only makes sense when you map milliampere-hours onto the current levels those cells can actually sustain.
This article is exactly the resource I wish I’d had that night. It organizes the 21700 landscape into four capacity tiers — 4000mAh, 4200–4500mAh, 5000mAh, and 5500–6000mAh — and explains what each tier can realistically deliver in terms of continuous current, voltage sag, and real-world runtime. Whether you’re feeding a hot-rod flashlight, building a 13S e-bike pack, or just trying to pick the best cell for the Sofirn SP35 sitting on your nightstand, this tier list will help you match the right number to the right application.
Tier 1: 4000mAh — The High-Drain Specialist
The 4000mAh capacity tier is the domain of high-drain 21700 cells. These cells sacrifice some energy density relative to their 5000mAh siblings in exchange for the ability to deliver truly punishing continuous discharge currents. The archetype of this tier is the Samsung 40T, which offers a rated capacity of 4000mAh and an astonishing 35A continuous discharge rating (with a 45A temperature-limited burst). The Molicel P42A sits in the same neighborhood with 4200mAh and a 30A continuous rating (35A temperature-limited).
Why would anyone buy a 4000mAh cell when 5000mAh cells exist? Because if your device pulls 20A or more continuously — think multi-emitter hot-rods, high-power vaping mods, cordless power tool packs, or the throttle-happy e-bike controller on a steep hill — a 5000mAh cell rated for only 10A will sag so badly under that load that its effective usable capacity collapses. The Samsung 40T, by contrast, will hold its voltage steady under 20A and deliver nearly its full rated capacity. The trade-off is that at low to moderate currents (under 5A), the Samsung 40T runs out of energy noticeably sooner than a Samsung 50E, because its total stored energy is 20% lower.
The Samsung 40T uses a relatively high internal resistance that still manages to be competitive at 35A, and its continuous rating as a “true 35A cell” where many competitors are limited to 30A is a key differentiator. If your application demands sustained high current, start in our High-Drain 21700 batteries category, where you can filter by continuous discharge rating.
Tier 2: 4200–4500mAh — The Compromise Zone
Between the 4000mAh power monsters and the 5000mAh energy kings sits a small but important group of cells that try to split the difference. The Molicel P42A (4200mAh, 30A continuous) and the Samsung 50G (4500mAh, 10A) represent the two ends of this tier’s philosophy.
The Molicel P42A gives you 200mAh more than the Samsung 40T while retaining a very respectable 30A continuous capability — enough for almost any consumer flashlight and most moderate e-bike builds. It’s a favorite among builders of high-performance 2S and 3S packs who want a bit more runtime without dropping into the low-discharge limitations of the 5000mAh tier.
The Samsung 50G, by contrast, leans toward capacity: 4500mAh at 10A. It’s a transitional cell that makes sense if you find the 5000mAh Samsung 50E’s 9.8A rating just slightly too tight for your application but don’t need the muscle of a 40T. For most EDC flashlights, the 50G’s extra 500mAh over a 4000mAh cell is noticeable in medium-mode runtime, and the 10A ceiling is more than enough for single-emitter pocket lights.
In practical terms, this tier is most useful when you’re building a pack with a known current ceiling — say, a 20A BMS limited pack — and you want to squeeze the maximum total watt-hours out of the cells without violating their ratings. Both the P42A and the 50G are available in our standard High-Drain 21700 batteries section, and the 50G is also listed under our passive-draw optimized selections.
Tier 3: 5000mAh — The Default Workhorse
If the 21700 format has a “standard” capacity, it is 5000mAh. This tier is populated by three major contenders — the Samsung 50E, the Samsung 50S, and the EVE 50E — and between them they cover virtually every use case below the extreme high-drain ceiling.
Samsung 50E (5000mAh, 9.8A continuous): This is the cell that powers more 21700 flashlights than any other. It’s the default recommendation for single-emitter EDC lights, headlamps, and low-drain power banks because it squeezes the maximum watt-hours into the 21×70 mm cylinder. Its 9.8A rating is sufficient for any light with a regulated driver that draws under 8A on turbo, and the 50E’s gentle discharge curve under 3A loads translates to extremely flat medium-mode runtime. Mooch’s independent bench testing rated it at an estimated 4900mAh at 2A discharge.
Samsung 50S (5000mAh, 25A continuous / 45A temperature-limited): The 50S is what happens when Samsung applies the same high-drain electrode design philosophy from the 40T to a higher-capacity platform. It delivers a full 5000mAh with a massive 25A continuous rating — enough to support multi-emitter lights and moderate e-bike loads without the capacity penalty of the 4000mAh tier. In testing, Mooch rated this cell as an “amazing performer for the capacity,” noting that it is the better choice for applications running below 25A (compared to cells like the Molicel P42A or P45B). Ratings at 5A and 10A discharge came in at 4800mAh and 4700mAh respectively. The 50S also features a 45A temperature-limited rating, meaning it can deliver extremely high current for short bursts without permanent damage — though sustained operation at 45A will cause the cell to heat rapidly and should be avoided. I personally run the Samsung 50S in my Sofirn SP35 for mixed-use EDC and have switched most of my medium-power 21700 lights to this cell.
EVE 50E (5000mAh, 9.8A continuous): EVE is one of China’s largest lithium battery manufacturers, and their 50E is a direct competitor to Samsung’s 50E with nearly identical specs. Independent testing shows very comparable capacity and internal resistance, often at a lower price point.
For most readers trying to pick a 21700 for a flashlight or power bank, the 5000mAh tier is where you should start. Browse our High-Capacity 21700 cells category to compare the 50E, 50S, and EVE variants side by side.
Tier 4: 5500–6000mAh — The Range Kings
At the top of the capacity pyramid sit the ultra-high-capacity 21700 cells: the Lishen LR2170LA (5500mAh, 10A) and the Vapcell F60 (6000mAh, 12.5A continuous). These cells push the 21700 format to its current practical limits by using every available cubic millimeter of internal volume for active electrode material. The F60, in particular, stands as the highest-capacity 21700 cell commercially available at the time of writing, and it achieves that 6000mAh figure while still delivering a very usable 12.5A continuous discharge.
Where do 6000mAh cells shine? Low-drain applications where runtime truly is king: long-distance hiking headlamps running all night on medium, remote IoT sensor nodes that need to report data for weeks without a recharge, USB power banks assembled from 1S3P or 1S4P configurations where the total watt-hours directly translate to more phone charges, and solar-charged field radios. The Vapcell F60 is also popular with night photographers who power small tracking mounts and dew heaters from a single 21700.
The F60 does have a slightly higher internal resistance than the Samsung 50-series cells — around 18–21 mΩ in tested samples — which means voltage sag is marginally greater at higher currents. But below approximately 5A continuous load, the difference in voltage stability between the F60 and a Samsung 50E is negligible, and the 20% capacity advantage translates directly into 20% longer runtime. If you’re building a power bank that draws 2A per cell, the F60 gives you approximately 21.6 watt-hours per cell compared to the 50E’s 18 watt-hours — that extra 3.6 watt-hours per cell adds up fast in a multi-cell pack.
You can find the Vapcell F60 6000mAh 21700 in our product catalog, complete with discharge curves at multiple C-rates and verified compatible charger recommendations.
How Capacity Tiers Relate to Form Factor Choices
The capacity advantage of the 21700 over the 18650 is one of the most important context points for understanding this tier list. A 5000mAh Samsung 50E contains roughly 47% more volume than a 3500mAh 18650, but delivers 43% more capacity — a near-perfect linear scaling. The Lishen LR2170LA at 5500mAh jumps that to 57% more capacity, and the Vapcell F60 at 6000mAh delivers a 71% increase. These numbers explain why so many manufacturers have migrated their flagship flashlights and power tools from 18650 to 21700 platforms. We’ve unpacked the full geometric and electrochemical explanation — including why capacity gains can exceed volume gains — in our dedicated comparison: 21700 vs 18650: Why 47% More Volume Delivers 60%-100% More Capacity.
Matching the Tier to the Application: A Practical Cheat Sheet
Here’s the decision matrix I’ve developed after building dozens of 21700 packs for flashlights, power banks, and e-bike projects:
Multi-emitter hot-rod flashlights (FET driver, 20A+ draw): Samsung 40T or Molicel P42A. Capacity is secondary to voltage stability under load.
Regulated single-emitter EDC lights (3–8A turbo): Samsung 50S. It offers the best balance of capacity and discharge headroom.
Low-drain single-emitter lights, headlamps, small power banks (≤5A): Samsung 50E, EVE 50E, or Vapcell F60 for maximum runtime.
E-bike packs (10S–14S, 15–30A controller): Samsung 50S for mixed riding; Samsung 40T or Molicel P42A for high-performance off-road builds with heavy throttle use.
DIY USB-C power banks (1S3P–1S6P): Vapcell F60. The extra 1200mAh per cell compared to a 50E translates to roughly one extra smartphone charge in a 3-cell configuration.
Solar storage / long-cycle-life applications: Consider LiFePO4 21700 cells (IFR21700), which operate at 3.2V nominal and 3000–3600mAh but deliver 3000+ cycles. Available in our LiFePO4 category.
The Bottom Line
A capacity number printed on a 21700 wrapper is a promise that the cell can only keep under specific conditions. A 4000mAh Samsung 40T delivers nearly its entire rated capacity under a 20A load, while a 5000mAh Samsung 50E under the same load would sag so severely that its effective capacity plummets below 4000mAh. The right cell for your device is the one whose continuous discharge rating comfortably exceeds your device’s maximum current draw, and whose capacity you can actually access at that draw level.
If you’ve read this far and you’re ready to put the tier list into action, Browse All 21700 Batteries in our aggregated store. Filter by capacity, continuous discharge rating, and chemistry to find the cell that matches your device’s actual power profile — not just the biggest number on the label.