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18650 Battery Pack 7.4V 5200mAh 2S2P Rechargeable Li-ion Pack for Power Tool Robot Vacuum Medical Device Portable Equipment | CE UN38.3 | OEM Factory Direct
$11.80
๐ 18650 Battery Pack 7.4V 5200mAh 2S2P โ Rechargeable Li-ion Pack
Overview
This 7.4V 2S2P lithium-ion battery pack uses four Grade A 18650 cells โ two in series, two in parallel โ to deliver stable 7.4V / 5200mAh (38.48Wh). The 5200mAh capacity (based on 2600mAh/cell) offers a slight runtime advantage over standard 5000mAh packs while maintaining the same compact 2S2P form factor. Integrated BMS with 4-cell balancing, overcharge, over-discharge, and short-circuit protection ensures reliable performance across power tools, robot vacuums, medical portable devices, AGV carts, and industrial handheld equipment. CE and UN38.3 certified, with full OEM customization available.
Key Specifications
| Parameter | Specification |
|---|---|
| Configuration | 2S2P |
| Cell Spec | 4ร Grade A 18650 (2600mAh/cell) |
| Nominal Voltage | 7.4V |
| Fully Charged Voltage | 8.4V |
| Capacity | 5200mAh |
| Energy | 38.48Wh |
| Internal Resistance | โค 140mฮฉ (pack) |
| Weight | โ 225g |
| Charge Voltage | 8.4V |
| Recommended Charge | 0.5C = 2.6A CC/CV |
| Max Charge Current | 5.2A (1C) |
| Continuous Discharge | 10.4A (2C) |
| Peak Discharge | 20.8A (4C) |
| Discharge Cut-off | 6.0V (3.0V/cell) |
| Self-discharge Rate | โค 2% / month |
| Cycle Life | โฅ 500 cycles |
| Capacity Retention | โฅ 80% after 500 cycles |
| Operating Temp | -20ยฐC ~ 60ยฐC |
| Storage Temp | -10ยฐC ~ 25ยฐC |
| Balance Connector | JST-XH 3Pin (2S) |
| Discharge Connector | XT30 / custom |
| Wire Gauge | AWG18 |
| Certification | CE / UN38.3 / RoHS |
5200mAh vs Nearby Capacities โ Which to Choose?
| Capacity | Cell | Energy | Weight | Cycle Life | Price Point |
|---|---|---|---|---|---|
| 4000mAh | 2000mAh/cell | 29.6Wh | โ190g | โฅ500 | Budget OEM |
| 5000mAh | 2500mAh/cell | 37.0Wh | โ220g | โฅ500 | Standard |
| 5200mAh โญ | 2600mAh/cell | 38.48Wh | โ225g | โฅ500 | Best value |
| 6000mAh | 3000mAh/cell | 44.4Wh | โ260g | โฅ500 | Premium |
| 7000mAh | 3500mAh/cell | 51.8Wh | โ300g | โฅ480 | Max capacity |
โญ 5200mAh sweet spot: 2600mAh is the most mature and cost-effective high-capacity 18650 cell size โ better energy-per-dollar than 2500mAh with less cycle degradation than 3000mAh+ cells.
2S2P Cell Architecture
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
โ String 1: [A]โโโโโโ[B] โ 3.7V + 3.7V = 7.4V
โ โ โ
โ String 2: [C]โโโโโโ[D] โ 3.7V + 3.7V = 7.4V
โ Parallel โ
โ Result: 7.4V / 5200mAh โ
โ 4 ร 2600mAh Grade A cells โ
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโBMS Protection Details
| Protection | Threshold | Function |
|---|---|---|
| โก Overcharge per cell | 4.25V cutoff | Prevents thermal runaway |
| ๐ Over-discharge per cell | 3.0V cutoff | Preserves cycle life |
| โ๏ธ Cell balancing | Auto on charge | Equalizes all 4 cells |
| ๐ฅ Overcurrent | >20.8A trip | Protects motor & device circuits |
| โ ๏ธ Short-circuit | Instant cutoff | Field & user safety |
| ๐ก๏ธ Over-temperature | 65ยฐC cutoff | Enclosed housing protection |
| ๐ Auto-recovery | After fault cleared | Field-friendly operation |
Applications
| Industry | Typical Devices |
|---|---|
| ๐ง Power Tools | Cordless drills, circular saws, angle grinders |
| ๐ค Robotics & Cleaning | Robot vacuums, floor sweepers, robotic arms |
| ๐ฅ Medical | Portable monitors, infusion pumps, mobile carts |
| ๐ญ Industrial | AGV carts, handheld terminals, field instruments |
| ๐ต Light EV | Low-speed scooters, golf carts, mobility aids |
| ๐ฎ RC & Hobby | Large RC cars, combat robots, RC boats |
| ๐ก Energy Backup | Portable UPS, solar storage, emergency packs |
| ๐ Smart Home | Robot lawn mowers, smart pool cleaners |
Runtime Estimation
| Device | Power Draw | Estimated Runtime |
|---|---|---|
| Robot vacuum (mid-size) | 25W | โ 92 min |
| Cordless drill | 50W | โ 46 min |
| Handheld terminal | 10W | โ 3.8 hours |
| AGV motor (light load) | 80W | โ 29 min |
| Portable monitor | 20W | โ 1.9 hours |
๐ Based on 38.48Wh at 85% system efficiency.
Charging Guide
| Mode | Current | Time | Recommendation |
|---|---|---|---|
| Standard 0.5C | 2.6A | โ 120 min | โ Best cycle life |
| Normal 1C | 5.2A | โ 65 min | โ Daily use |
| Fast 2C | 10.4A | โ 32 min | โ ๏ธ Occasional only |
| Storage mode | 2.6A โ 7.6V | โ | โ >3 days storage |
โ ๏ธ Use 8.4V / 2S balance charger with JST-XH 3Pin balance connector only.
Default Package Configuration
| Item | Specification |
|---|---|
| Pack | 18650 2S2P 7.4V 5200mAh |
| Cells | 4ร Grade A 18650 2600mAh |
| BMS | โ 4-cell balancing + full protection |
| Discharge connector | XT30 (customizable) |
| Balance connector | JST-XH 3Pin |
| Wire gauge | AWG18 |
| Wire length | 150mm |
| Housing | PVC heat shrink / ABS case (select) |
| Label | Standard / OEM white-label |
| Stock | โ In stock โ ships within 5 business days |
OEM / Custom Options
| Option | Details |
|---|---|
| Capacity | 4000 / 5000 / 5200 / 6000 / 7000mAh |
| Configuration | 2S1P / 2S2P / 2S3P / 2S4P |
| Connector | XT30 / XT60 / DC Jack / Anderson / bare wire |
| Wire length & gauge | 100~300mm / AWG14~AWG22 |
| BMS | Standard / Smart BMS with fuel gauge IC |
| Housing | PVC wrap / ABS hard case / custom enclosure |
| Certification | CE, UN38.3, RoHS, UL1642, IEC62133 |
| Branding | OEM / white-label labeling & packaging |
| MOQ | 20 pcs |
Certification & Air Freight Status
| Item | Detail |
|---|---|
| โ CE | EU market standard |
| โ UN38.3 | Global freight certified |
| โ RoHS | Substance compliance |
| Energy | 38.48Wh |
| IATA Category | Section II |
| Air freight | โ Eligible โ minimal DG restrictions |
โ๏ธ At 38.48Wh, this pack comfortably sits within IATA Section II โ the simplest and most cost-effective air freight category for lithium battery packs.
Why Choose Us?
- ๐ญ Factory Direct โ own 18650 pack assembly lines, zero intermediaries
- ๐ 2600mAh Grade A cells โ mature, stable chemistry, best cycle life in class
- โ๏ธ 4-cell BMS balancing โ every pack cell-balanced before shipment
- โ๏ธ Section II air freight โ 38.48Wh, lowest DG shipping complexity & cost
- ๐ CE + UN38.3 standard โ full documentation included
- ๐ฌ 10-day OEM sample โ any capacity, connector, housing combination
- ๐ ๏ธ Full OEM service โ spec engineering to certified mass production
๐ฉ Contact us with your current draw, runtime target & housing spec โ optimal 2S2P configuration quoted within 24 hours.
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