Shenzhen RYDBATT Electronics Co., Ltd. is one of the leading manufacturers and suppliers of high drain 6s1p 21700 li ion cells for drones uavs in China. Welcome to buy CE approved batteries in stock here and get free sample from our factory. All customized products are with high quality and low price.
High Drain 21700 Li ion Cells for Drones UAVs
Long Flight Time, High Discharge
21700
Cell format
High-Drain
Continuous + pulse discharge
6S1P–14S
Custom pack assembly
No-Logo
Neutral / OEM / ODM supply
High Drain 6S1P 21700 Li ion Cells for Drones UAVs
Drone batteries are a compromise between two opposing goals: energy density (total energy carried -flight time) and power density (how quickly energy is released thrust and control authority). For most multirotor platforms, the 21700 high-drain Li-ion cell is the sweet spot that LiPo packs and low-rate cells each miss in different ways.
Low internal resistance is what makes high discharge possible- but the design choices that reduce resistance (thinner electrodes, more current-collecting foil, higher-conductivity additives) reduce the active material you can fit into the same can. A cell built for 10C looks very different from one built for 3C
Low-drain / energy cells (≈5–10A)
offer maximum capacity but sag badly under multirotor loads - causing voltage drop, throttle weakness, and heat that shortens service life.
Ultra-high-drain cells (≈35–45A)
hold voltage under extreme loads but sacrifice 20–30% of capacity, cutting flight time on endurance missions.
High-drain cells in the middle band (≈20–30A continuous)
keep voltage stable during climb-outs while preserving enough capacity for 30–45-minute missions.
18650 vs 21700 vs LiPo Cells
|
Consideration |
18650 Li-ion |
21700 Li-ion |
LiPo pouch |
|
Volume vs. capacity |
Baseline |
≈30–50% more capacity per cell |
Lower volumetric efficiency |
|
Cells needed per pack |
More cells, more welds, more BMS channels |
Fewer cells for the same Wh |
Single or few cells per pack |
|
High-rate capability |
Limited; fewer high-drain options |
Strong; broad high-drain range |
Excellent (very high C-rate) |
|
Cycle life & robustness |
Good |
Good, steel can resists swelling |
Lower; prone to puffing if abused |
|
Typical use case |
Light platforms, budget builds |
Long-endurance & industrial UAV |
Racing FPV, short high-punch flights |
How to Match a Cell to Your Airframe (Selection Logic)
- Start from hover current. Estimate the platform's hover current draw; your continuous cell rating should sit comfortably above it, so that climb-outs stay within the pulse window rather than pushing the cells to their limit.
- Check voltage sag at max throttle. Internal resistance (mΩ) determines how far the voltage drops under peak load. Lower resistance means steadier thrust and less heat.
- Then maximise capacity. Once the cell can hold voltage under load, every remaining gram should go towards capacity - this is the direct lever for flight time.
- Match the pack configuration to your power system. 6S for 22.2V nominal platforms, and 12S/14S for high-voltage industrial airframes - see Pack Options below.
Rule of thumb: choose the lowest-resistance cell that lets your platform complete every mission profile without voltage-sag alarms - then pick the highest capacity that fits your weight budget. That is the high-drain sweet spot.
Specifications - 21700 High-Drain Li-ion Cell Range
Three pertormance tiers dial in masimum endurance or maximum disr narge. All rells are ryind ical 21700 tormat (0 21.0 mm x 70.5 mm).
arand-neutral, with a tull datasheet cn request.
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Parameter |
Specification |
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Cell format |
21700 cylindrical (Ø 21.0mm × H 70.5mm) |
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Chemistry |
NMC (ternary lithium-ion) |
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Nominal voltage |
3.6V · charge cut-off 4.20V · discharge cut-off 2.5V |
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Internal resistance (AC, 1kHz) |
≈12–20 mΩ depending on tier |
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Weight |
≈70 g (66–72 g by tier) |
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Operating temperature |
Charge 0–45℃ · Discharge -20–60℃ |
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Storage temperature |
-20–25℃ recommended, 60% RH ≤ |
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Standard charge |
0.5C CC-CV to 4.20V, 0.02C cut-off |
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Cycle life |
≥500 cycles to 80% of initial capacity (1C/1C, 25℃) |
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Certification |
UN38.3 · MSDS · IEC 62133 (available formats) · CE/UKCA (pack level, on request) |
Compliance & configuration note: every figure above is a datasheet value measured under standard test conditions. Real pack performance - flight time, peak current, and temperature rise - depends on your configuration, airflow, and mission profile. We publish what we test, and we will confirm the numbers that apply to your build before you commit. A full specification sheet, UN38.3 test summary, and MSDS are available under NDA on request.
Custom Drone Battery Pack Options - 6S1P, 6S2P and Beyond
Buying bare cells keeps your options open; buying assembled packs removes the welding, BMS, and testing work from your production line. RYDBATT supplies both. Our custom drone battery pack service covers cell selection, spot welding, BMS integration, harness and connector termination, wrapping, labelling, and pack-level testing.
|
Configuration |
Pack Voltage (nominal) |
Typical Capacity |
Typical Energy |
Best for |
|
6S1P - 6 cells |
≈21.6V |
≈4,000–5,000 mAh |
≈86–108 Wh |
Compact FPV and light commercial airframes |
|
6S2P - 12 cells |
≈21.6V |
≈8,000–10,000 mAh |
≈173–216 Wh |
Long-endurance FPV, mapping and inspection |
|
12S2P - 24 cells |
≈43.2V |
≈8,000–10,000 mAh |
≈345–432 Wh |
Agricultural spraying and heavy-lift payloads |
|
14S4P - 56 cells |
≈50.4V |
≈16,000–20,000 mAh |
≈806–1,008 Wh |
Industrial UAV power, long-range logistics |
Pack Service Scope
Cell selection & matching - capacity, internal resistance, and voltage are graded before assembly so no weak cell limits the pack.
Welding & BMS - nickel-strip spot welding with your choice of BMS: balancing, over-current, over-temperature, and SOC reporting.
Connectors - Anderson, ring terminals, or custom options
Pack-level testing - capacity, resistance, charge/discharge, and balance verification before shipment, with a serialised test record.
Custom configurations from 3S to 14S, 1P to 8P. Send your voltage, capacity target, peak current, and connector type - we will return a build specification and sample lead time, typically within 1–2 business days.
Applications - Commercial UAV Platforms
Our high-drain 21700 cells and packs are supplied for civil, commercial, and industrial UAV use:
FPV & long-range flight
FPV drone battery builds where punch and endurance both matter: freestyle, cinematic, and long-range cinematic platforms.
Aerial photography & mapping
steady voltage under hover load keeps camera gimbals and RTK payloads stable across a full survey grid.
Agricultural spraying
high-current packs designed for the heavy, sustained load of tank-and-pump agricultural drone missions across large fields.
Power line & infrastructure inspection
predictable capacity and stable discharge for repeatable inspection flight plans and accurate battery-state logging.
Logistics & delivery
high energy per kilogram extends payload range for last-mile drone delivery trials and operations.
Survey & environmental monitoring
consistent, low-self-discharge cells for seasonal deployment and long storage between campaigns.
Intended for civil and commercial applications only. Products are not supplied, tested, or certified for military, weapon, or combat-related use.
SUPPLY & QUALITY CONTROL
Neutral Supply, Factory-Backed QC, Full Documentation
For distributors, pack builders, and integrators, brand matters. We ship neutral, unbranded cells with no logo - plain shrink wrap or your artwork, your packaging, and your part numbers. You present the product as your own. Where you want a fully finished product, our OEM/ODM service covers custom wrap printing, pack labelling, retail packaging, and instruction inserts.
1
Requirement review - voltage, capacity, continuous and peak current, connector, and enclosure requirements.
Proposal - cell tier recommendation, configuration, BMS selection, indicative price, and lead time.
Sample - prototype pack with a test report for evaluation on your platform.
Validation & approval - sample confirmation, specification sign-off, and packaging artwork approval.
Mass production - production to the approved specification with batch-level QC records.
Shipment - UN38.3-compliant packaging, documentation, and freight coordination.
2
Incoming inspection - cell voltage, capacity, and internal resistance screening.
In-process control - graded cell matching, weld pull-strength checks, and BMS parameter verification.
Pre-shipment testing - full charge/discharge cycle, balance check, appearance and weight verification, and serialised records.
Traceability - batch and serial numbers retained so any pack can be traced back to its cell lot.
3
UN38.3 · MSDS · IEC 62133 · CE / UKCA (pack level) · RoHS - certification coverage depends on cell format and pack configuration. Tell us your destination market, and we will confirm exactly which documents apply and provide copies under NDA.
RYDBATT (Shenzhen Ryder Electronics / Huizhou Ryder New Energy) has specialised in lithium battery system integration and custom pack solutions since 2005, operating ISO-certified laboratories and quality systems with export experience across European markets.
Frequently Asked Questions
Q: 1. What is your MOQ for high-drain 21700 cells and custom drone battery packs?
A: For bare cells, the MOQ is [X] cells per model and capacity tier - low enough for evaluation builds and sized so we can guarantee matched-cell consistency. For custom packs, the MOQ is [Y] packs per configuration, and sample quantities (1–5 units) can be arranged before committing to a production run. Tell us your target order volume, and we will confirm the exact figures with your quote.
Q: 2. How long does a custom pack take, from specification to delivery?
A: Typical timeline: 1–2 business days for a proposal, 30 days for a prototype sample (including pack-level testing), and 90 days for mass production after sample approval, plus shipping. Faster turnaround is possible for repeat configurations. Production lead time starts on the date the approved specification and deposit are received.
Q: 3. Which shipping methods do you use for UAV battery cells and packs, and are they compliant?
A: Lithium-ion cells are UN Class 9 dangerous goods, so all shipments use certified UN38.3-compliant packaging and documentation. We ship by air freight (3–8 days to most European destinations), sea freight for larger volumes (economical, with longer transit times), rail and road for Eastern European and CIS routes, and express courier for samples. We handle the dangerous-goods paperwork and can quote EXW, FOB, CIF, or DDP terms - DDP is often simplest for buyers in Ukraine and neighbouring markets.
Q: 4. What certifications do your cells and packs carry?
A: Cells are supported by UN38.3 test summaries, MSDS, and IEC 62133 where applicable to the format. Pack-level CE/UKCA and RoHS documentation is prepared according to the configuration. Because certification scope is configuration- and market-specific, we confirm the exact document set for your destination before shipment and can provide copies under NDA.
Q: 5. Can you supply cells without your brand, and do you support private labelling?
A: Yes - neutral, no-logo supply is one of our standard supply models for distributors and pack builders. We ship plain-wrapped or custom-printed cells and packs with your branding, part numbers, and packaging. Full OEM/ODM support is available, from wrap artwork to retail-ready boxes and instruction inserts.
Q: 6. How do I know these cells will actually improve my platform's flight time?
A: We work from your numbers rather than from marketing claims. Share the platform's hover current, peak current, pack weight budget, and mission duration target, and our engineers will recommend the tier and configuration that fits - then send a sample so you can verify performance on your own airframe. Every specification we publish is a datasheet value measured under standard conditions, not an estimate. Flight time is configuration-dependent, and we will state clearly what we tested and under what conditions.
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