🔋 18650 7S1P Battery Pack — 25.9V 2600mAh Rechargeable Li-ion Industrial Battery

Overview

This 18650 7S1P lithium-ion battery pack connects seven Grade A 18650 cells in series, delivering 25.9V / 2600mAh (67.34Wh) in a compact cylindrical blue PVC heat-shrink enclosure. The 25.9V output bridges the gap between standard 22.2V tool packs and 36V e-bike systems — making it the preferred choice for low-voltage electric scooters, light e-bikes, high-power cordless tools, brushless motor systems, and industrial automation equipment requiring stable sub-30V DC power. CE and UN38.3 certified, with full OEM customization available.

7S1P Architecture

[C1]─[C2]─[C3]─[C4]─[C5]─[C6]─[C7]

3.7V × 7 = 25.9V nominal
4.2V × 7 = 29.4V fully charged
Capacity  = 2600mAh
Energy    = 25.9V × 2.6Ah = 67.34Wh

Key Specifications

Parameter	Specification
Configuration	7S1P
Total Cells	7× Grade A 18650
Cell Capacity	2600mAh / cell
Nominal Voltage	25.9V
Fully Charged	29.4V
Capacity	2600mAh
Energy	67.34Wh
Internal Resistance	≤ 220mΩ (pack)
Weight	≈ 330g
Recommended Charge	0.5C = 1.3A CC/CV
Max Charge Current	2.6A (1C)
Continuous Discharge	5.2A (2C)
Peak Discharge	10.4A (4C)
Discharge Cut-off	21.0V (3.0V/cell)
Self-discharge Rate	≤ 2% / month
Cycle Life	≥ 500 cycles
Capacity Retention	≥ 80% at 500 cycles
Operating Temp	-20°C ~ 60°C
Storage Temp	-10°C ~ 25°C
Storage Voltage	26.6V (3.8V/cell)
Enclosure	Blue PVC heat-shrink
Balance Connector	JST-XH 8Pin (7S)
Discharge Connector	XT60 / custom
Wire Gauge	AWG16
Certification	CE / UN38.3 / RoHS

Full Voltage Reference

State	Voltage	Note
Fully charged	29.4V	4.2V × 7
Nominal	25.9V	Standard rating
Storage	26.6V	3.8V/cell — optimal
Low warning	23.1V	3.3V/cell — recharge
BMS cutoff	21.0V	3.0V/cell — hard stop
Overcharge cutoff	29.75V	4.25V/cell — BMS

Multi-Capacity SKU Options

SKU	Cell	Voltage	Capacity	Energy	Weight
7S1P-2200	2200mAh	25.9V	2200mAh	56.98Wh	≈290g
7S1P-2400	2400mAh	25.9V	2400mAh	62.16Wh	≈310g
7S1P-2600 ⭐	2600mAh	25.9V	2600mAh	67.34Wh	≈330g
7S1P-3000	3000mAh	25.9V	3000mAh	77.7Wh	≈370g
7S1P-3400	3400mAh	25.9V	3400mAh	88.06Wh	≈405g
7S1P-3500	3500mAh	25.9V	3500mAh	90.65Wh	≈415g

⭐ Default: 2600mAh Grade A — best balance of cycle life, cost, and energy density.

7S1P Position in Voltage Ladder

Config	Voltage	Charged	Key Application
5S1P	18.5V	21.0V	Laptops, projectors
6S1P	22.2V	25.2V	Power tools, lawn mowers
7S1P ⭐	25.9V	29.4V	E-scooters, light e-bikes
8S1P	29.6V	33.6V	High-power tools
10S1P	37.0V	42.0V	Standard e-bikes
13S1P	48.1V	54.6V	High-voltage e-bikes

📌 25.9V sweet spot: Higher than standard tool voltage (22.2V) yet below the 36V e-bike threshold — ideal for 24V-class systems and controllers rated 24V~29.4V.

7S1P vs 6S1P vs 8S1P

Metric	6S1P	7S1P	8S1P
Voltage	22.2V	25.9V	29.6V
Charged	25.2V	29.4V	33.6V
Energy	57.7Wh	67.3Wh	76.9Wh
Weight	≈290g	≈330g	≈375g
Best for	Power tools	E-scooters, 24V systems	High-power tools

Runtime Estimation

Device	Power Draw	7S1P-2600 Runtime
Electric scooter (low speed)	150W	≈ 27 min
Light e-bike (assist mode)	100W	≈ 41 min
Cordless circular saw	100W	≈ 41 min
Electric lawn mower	80W	≈ 51 min
Light AGV motor	60W	≈ 68 min
Industrial robot joint	40W	≈ 1.7 hours
Brushless RC platform	50W	≈ 1.4 hours

📌 Based on 67.34Wh at 85% efficiency.

24V System Compatibility

Controller Rating	Compatible with 7S1P	Notes
24V nominal	✅	25.9V within tolerance
24V~29.4V input	✅	Direct fit
24V brushless ESC	✅	Verify max input voltage
36V controller	❌	Use 10S1P instead
48V controller	❌	Use 13S1P instead

⚠️ Always verify your controller or device’s maximum input voltage tolerance — 7S1P reaches 29.4V when fully charged.

BMS Protection — 7-Cell System

Protection	Threshold	Function
⚡ Overcharge/cell	4.25V cutoff	Prevents thermal runaway
🔋 Over-discharge/cell	2.75V cutoff	Preserves cycle life
⚖️ Cell balancing	Auto on charge	Equalizes all 7 cells
🔥 Overcurrent	>10.4A trip	Protects motor circuits
⚠️ Short-circuit	Instant cutoff	User & device safety
🌡️ Over-temperature	65°C cutoff	Thermal protection
🔁 Auto-recovery	After fault cleared	Field-friendly

Applications

Industry	Typical Devices
🛵 E-mobility	Electric scooters, light e-bikes, electric wheelchairs
🔧 Power Tools	High-power cordless drills, saws, grinders
🌿 Garden	Electric lawn mowers, hedge trimmers, leaf blowers
🤖 Robotics	Light robot arms, educational platforms, autonomous systems
🏭 AGV	Light warehouse AGV, sorting equipment
🚗 RC & Hobby	Large RC vehicles, FPV platforms, RC boats
💡 Field Power	Portable lighting rigs, outdoor broadcasting
🏥 Medical	Mobile medical carts, portable rehabilitation equipment

✈️ IATA Air Freight Status

SKU	Energy	IATA	Status
7S1P-2200	56.98Wh	Section II	✅ Minimal restrictions
7S1P-2400	62.16Wh	Section II	✅ Minimal restrictions
7S1P-2600	67.34Wh	Section II	✅ Most shippable
7S1P-3000	77.7Wh	Section IB	✅ Standard DG
7S1P-3400	88.06Wh	Section IB	✅ Standard DG
7S1P-3500	90.65Wh	Section IB	✅ Below 100Wh

✈️ All 6 SKUs qualify for air freight — none exceed 100Wh. The 7S1P-2600 is the most logistics-friendly option at 67.34Wh Section II.

Charging Guide

Mode	Current	Time	Notes
0.5C Standard	1.3A	≈ 2h	✅ Best cycle life
1C Normal	2.6A	≈ 65min	✅ Daily use
2C Fast	5.2A	≈ 32min	⚠️ Occasional only
Storage mode	1.3A → 26.6V	—	✅ >3 days storage

⚠️ Must use 29.4V / 7S balance charger with JST-XH 8Pin balance connector.

Default Package Configuration

Item	Specification
Pack	18650 7S1P 25.9V 2600mAh
Cells	7× Grade A 18650 2600mAh
BMS	✅ 7-cell balancing + full protection
Enclosure	Blue PVC heat-shrink
Discharge connector	XT60 (customizable)
Balance connector	JST-XH 8Pin (7S)
Wire gauge	AWG16
Wire length	150mm
Label	Standard / OEM white-label
Stock	✅ In stock

OEM / Custom Options

Option	Details
Capacity	2200 / 2600 / 3000 / 3400 / 3500mAh
Config upgrade	7S2P / 7S3P for higher capacity
Enclosure color	Blue / Black / Red / Yellow / custom
Connector	XT60 / XT30 / Anderson / Deans / bare wire
Balance lead	JST-XH 8Pin (7S) standard
Wire gauge	AWG14 ~ AWG18
Smart BMS	UART / fuel gauge IC on request
Housing	PVC wrap / ABS hard case / custom
Certification	CE, UN38.3, RoHS, UL1642, IEC62133
Branding	OEM / custom color label
MOQ	10 pcs

Certification & Compliance

Certificate	Scope	Status
✅ CE	EU market	Standard
✅ UN38.3	Global freight	Standard
✅ RoHS	Substance compliance	Standard
✅ MSDS	Safety data sheet	Standard
📋 IEC 62133	Battery safety	On request
📋 UL 1642	US market	On request

Why Choose Us?

🏭 Factory Direct — own cylindrical pack assembly, zero intermediaries
🔵 Blue PVC series — consistent industrial product line identity (6S/7S/8S)
✈️ All SKUs air-freight eligible — max 90.65Wh, all below 100Wh
⚖️ 7-cell BMS balancing — every pack balanced to <5mV delta
🔋 Grade A cells only — 100% capacity verified before assembly
📋 CE + UN38.3 standard — full DG documentation included
🔬 7-day OEM sample — color, connector & capacity ready fast
🛠️ Full OEM service — spec to certified mass production

📩 Need 25.9V custom pack? Share motor KV, controller voltage rating & runtime target — we’ll engineer the optimal 7S configuration within 24 hours.

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7S1P 25.9V 2600mAh 18650 Li-ion Battery Pack Rechargeable for E-scooter Electric Bike Power Tool AGV Industrial Equipment | Custom 2200~3500mAh | CE OEM Factory

🔋 18650 7S1P Battery Pack — 25.9V 2600mAh Rechargeable Li-ion Industrial Battery

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