18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
  1. 18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
  2. 18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
  3. 18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct
  4. 18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct

18650 3.7V LiFePO4 2S1P Battery Pack Custom 21700 7.4V 11.1V Li-ion | 32650 32140 12V Pack | 3S1P OEM for Power Tool E-bike Solar Storage | CE UN38.3 | Factory Direct

$12.60

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🔋 Custom Battery Pack — 18650 / 21700 / 32650 / 32140 | Li-ion & LiFePO4 | 2S1P ~ 4S1P OEM Solutions

Overview

We manufacture fully customized battery packs across two chemistry platforms — standard Li-ion (3.7V) and LiFePO4 (3.2V) — using four major cylindrical cell formats: 18650, 21700, 32650, and 32140. Configurations range from 2S1P to multi-cell series/parallel combinations, covering output voltages from 3.7V to 48V+. Whether you need a compact 7.4V tool pack or a 12V LiFePO4 solar storage module, we engineer it to your exact specification with integrated BMS, CE, and UN38.3 certification.

Chemistry Platform Comparison

FeatureLi-ion (NMC/NCR)LiFePO4 (LFP)
Cell voltage3.7V nominal3.2V nominal
Full charge4.2V/cell3.65V/cell
Discharge cutoff2.75V/cell2.5V/cell
Energy density✅ HigherLower
Cycle life≥500 cycles≥2000 cycles
SafetyGoodExcellent — no thermal runaway
Temperature range-20°C ~ 60°C-20°C ~ 75°C
Best forPower tools, consumer devicesSolar, EV, industrial, UPS
4S voltage14.8V12.8V ≈ 12V

📌 Key rule: Always specify chemistry when ordering — a 12V LiFePO4 4S pack and a 14.8V Li-ion 4S pack are NOT interchangeable. BMS, charger, and cutoff voltages differ significantly.

Cell Format Specifications

CellChemistryDiameterLengthCapacityEnergy/cell
18650Li-ion18mm65mm2600~3000mAh9.6~11.1Wh
21700Li-ion21mm70mm4000~5000mAh14.8~18.5Wh
32650LiFePO432mm65mm5000~6000mAh16~19.2Wh
32140LiFePO432mm140mm10000~15000mAh32~48Wh

Voltage Configuration Matrix

ChemistryConfigVoltageCommon Use
Li-ion1S3.7VConsumer devices, IoT
Li-ion2S1P7.4VPower tools, robots
Li-ion3S1P11.1VLaptops, e-scooters
Li-ion4S1P14.8VDrones, heavy tools
LiFePO41S3.2VSingle-cell backup
LiFePO44S1P12.8V ≈ 12VSolar, UPS, marine
LiFePO48S1P25.6V ≈ 24VIndustrial EV, AGV
LiFePO416S1P51.2V ≈ 48VE-bike, solar systems

Popular Pack Configurations

PackCellChemistryVoltageCapacityEnergyBest For
2S1P18650 2600mAhLi-ion7.4V2600mAh19.2WhSlim tools, RC
2S2P18650 2600mAhLi-ion7.4V5200mAh38.5WhPower tools
3S1P18650 3000mAhLi-ion11.1V3000mAh33.3WhLaptop, e-scooter
3S2P21700 5000mAhLi-ion11.1V10000mAh111WhPower stations
4S1P32650 6000mAhLiFePO412.8V6000mAh76.8WhSolar, UPS
4S2P32650 6000mAhLiFePO412.8V12000mAh153.6WhSolar storage
4S1P32140 15000mAhLiFePO412.8V15000mAh192WhMarine, RV

Cell Format Selection Guide

Your PriorityRecommended CellReason
Max capacity in 18mm tube217004000~5000mAh vs 18650’s 3000mAh
Standard compatibility18650Most holders, chargers, and packs
Long cycle life + safety32650 LiFePO42000+ cycles, safest chemistry
Maximum single-cell energy32140 LiFePO415Ah per cell, lowest cell count
Lowest cost per Wh18650Highest volume production globally
Automotive / solar grade32650 / 32140Grade A LiFePO4, industry standard

LiFePO4 Pack — Key Advantages

  • ✅ ≥2000 cycle life — 4× longer than standard Li-ion, ideal for daily charge applications
  • ✅ Inherently safe chemistry — no thermal runaway risk, no cobalt
  • ✅ Wide temp range — -20°C ~ 75°C, excellent for outdoor solar & automotive use
  • ✅ Flat discharge curve — holds ~3.2V across 80% of capacity, stable load voltage
  • ✅ 12V drop-in compatible — 4S LiFePO4 (12.8V) replaces 12V lead-acid in many applications
  • ✅ RoHS & environmentally friendly — no heavy metals, recyclable

Li-ion Pack — Key Advantages

  • ✅ Higher energy density — more Wh per kg & per liter than LiFePO4
  • ✅ Wider cell selection — 18650 / 21700 widely available globally
  • ✅ Lower cost per Wh — most cost-effective for consumer & industrial applications
  • ✅ Compact form — smaller pack size for same energy vs LiFePO4
  • ✅ Proven OEM ecosystem — widest range of compatible BMS, chargers & holders

BMS Features — All Packs

ProtectionLi-ion ThresholdLiFePO4 Threshold
⚡ Overcharge/cell4.25V3.65V
🔋 Over-discharge/cell2.75V2.5V
⚖️ Cell balancing✅ Auto✅ Auto
🔥 OvercurrentPer pack ratingPer pack rating
⚠️ Short-circuitInstant cutoffInstant cutoff
🌡️ Over-temperature65°C75°C
📊 Smart BMS optionUART / I²CUART / CAN bus

Applications

IndustryLi-ion PackLiFePO4 Pack
🔧 Power Tools✅ 7.4V ~ 14.8V—
🤖 Robotics & AGV✅ 11.1V ~ 14.8V✅ 12V ~ 24V
🚲 E-bike / EV✅ 36V ~ 48V (10S+)✅ 48V (16S)
☀️ Solar Storage—✅ 12V / 24V / 48V
🚢 Marine / RV—✅ 12V / 24V
💻 Laptops & UPS✅ 10.8V ~ 14.8V✅ 12V UPS
🏥 Medical✅ 7.4V ~ 11.1V✅ 12V carts
🏭 Industrial✅ 14.8V✅ 24V ~ 48V
💡 Emergency Backup✅ Portable✅ Long-cycle UPS

OEM / Custom Options

OptionLi-ionLiFePO4
Cell format18650 / 2170032650 / 32140
Capacity range2600~5000mAh/cell5000~15000mAh/cell
Voltage range3.7V ~ 48V+3.2V ~ 51.2V+
Configuration1S~16S / 1P~6P1S~16S / 1P~4P
ConnectorXT30/60/90 / Anderson / DC Jack / customAnderson / XT90 / custom
Wire gaugeAWG10 ~ AWG22AWG8 ~ AWG18
BMS typeStandard / Smart UART / I²CStandard / Smart CAN / RS485
HousingPVC / ABS / Aluminum / customABS / Aluminum / custom
CertificationCE, UN38.3, RoHS, UL1642, IEC62133CE, UN38.3, RoHS, IEC62619
MOQ10 pcs10 pcs

Certification & Compliance

CertificateLi-ionLiFePO4Status
✅ CE✅✅Standard
✅ UN38.3✅✅Standard
✅ RoHS✅✅Standard
✅ MSDS✅✅Standard
📋 UL 1642✅—On request
📋 IEC 62133✅—On request
📋 IEC 62619—✅On request
📋 UN38.3✅✅On request

IATA Shipping Reference

Pack EnergyIATA CategoryAir Status
< 20WhSection II✅ Minimal restrictions
20 ~ 100WhSection IB✅ Standard DG
100 ~ 160WhSection IA⚠️ Special handling
> 160WhCargo only🚢 Sea freight recommended

📌 LiFePO4 packs over 100Wh are common — we advise sea freight for 4S2P 32140 packs and above.

Why Choose Us?

  • 🏭 Factory Direct — own assembly lines for both Li-ion and LiFePO4 packs
  • 🔋 Dual chemistry expertise — single supplier for NMC/NCR Li-ion AND LFP packs
  • 📐 4 cell formats — 18650 / 21700 / 32650 / 32140 all in-house
  • ⚖️ BMS cell balancing standard — every pack shipped balanced and tested
  • 📋 CE + UN38.3 ready — full documentation for global procurement
  • 🔬 10-day OEM sample — any chemistry, any config, rapid turnaround
  • 🚢 DG logistics support — air and sea freight guidance for all pack sizes
  • 🛠️ End-to-end OEM — spec engineering to certified mass production

📩 Specify your chemistry (Li-ion or LiFePO4), voltage, capacity & application — we’ll design and quote the optimal pack within 24 hours.

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