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18650 lithium battery 3.7V 21Ah li-ion battery packs product photo

18650 lithium battery 3.7V 21Ah li-ion battery packs

18650 lithium battery 3.7V 21Ah with PCM and JST-PHR-2P connector for lighting and energy storage. Customised packs are available.

  • Model: ICR18650 1S7P
  • Application: lighting, digital products, energy storage etc.
  • Cycle life: more than 500 times
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Category: 18650 Li-ion Battery

Product Overview

18650 Lithium Battery 3.7V 21Ah Li-ion Battery Packs

Size: 22*75*131mm. Model: ICR18650 1S7P.

Key Benefits

Cycle Life

The 18650 Li-ion Battery range is published at around 500 cycles.

Stated Electrical Data

Nominal voltage 3.7V, typical capacity 21Ah. The complete parameter table is published below, not summarised.

Built-in Protection

Supplied with a protection circuit against over-charge, over-discharge, over-current and short circuit.

Working Range

Operating temperature is published per state. Charge: 0~45℃; Discharge: -20~60℃.

Built To Order

Capacity, arrangement, case, terminal, cable, connector and custom logo are all specified by the customer. Dimensions are made according to the device's request.

Application Scenarios

Application: lighting, digital products, energy storage etc.

Who It Is For

  • Power tool and garden tool brands
  • E-bike and light electric vehicle builders
  • LED lighting, portable audio and sprayer manufacturers
  • Medical and instrument makers needing a compact 11.1V or 14.8V pack

Problems It Solves

  • Packs that run flat before the shift ends
  • Tool housings that will not take a wider or longer pack
  • Products that need a specific connector, not whatever the pack maker had in stock

Specifications

18650 Lithium Battery 3.7V 21Ah Data Sheet

18650 Lithium Battery 3.7V 21Ah Data Sheet
ItemRatingNote
1.1 CapacityTypical: 21AhDischarge: 0.2CmA
Min.: 20Ah
1.2 Nominal VoltageAverage 3.7V
1.3 Discharge Cut-off Voltage3.0V
1.4 Charge Current4000mAStandard Charge
1.5 Charge Voltage4.2V
1.6 Charge TimeApprox 6hCharge: 0.2CmA
1.7 Max. Charge Current1C
1.8 Max. discharge current1C
1.9 WeightApprox 360g
1.10 Operating TemperatureCharge: 0~45℃
Discharge: -20~60℃
1.11 Storage Temperature<1 month: -10~45℃Recommended storage temperature: 20℃, at the shipment state
<3 month: -10~35℃

Data sheet published by Sunder Battery for this model.

Customization Options

Sunder is an OEM and ODM manufacturer. The list below is what is decided by the customer rather than by us.

  • Series and parallel arrangement to reach the voltage and capacity you need
  • Case, terminal and cable length to match the equipment it replaces
  • Connector fitted to your mating part
  • Custom logo and label
  • Dimensions made according to the device's request
What we need from you. Voltage, capacity or run time, peak current, the space available, the connector on your board and the operating temperature range. A drawing or the pack you use now answers most of these at once.

Use Guide

  1. Charge with CC then CV

    Charge at 0.2C constant current to 4.2V, then hold that voltage until the current tails off.

  2. Do not over-discharge

    Stop at the published cut-off voltage. Repeated deep discharge is what shortens a lithium ion pack fastest.

  3. Keep it cool

    Charge between 0℃ and 45℃. Heat, not cycles, ends most tool packs.

  4. Store part charged

    Store around 20℃ in the shipment state rather than fully charged or flat.

Questions About The 18650 lithium battery 3.7V 21Ah li-ion battery packs

What are the nominal voltage and capacity of the 18650 lithium battery 3.7V 21Ah li-ion battery packs?

Nominal voltage 3.7V and typical capacity 21Ah. The full parameter table is published on this page.

How many cycles does it give?

The 18650 Li-ion Battery range is published at around 500 cycles.

What charge voltage should I use?

4.2V, charged constant current then constant voltage. The normal charge current is 0.2C to 0.5C and the maximum is 1C.

What does it weigh?

Approximately 360g. The dimension and weight for every model in the range are in the model list on this page.

Can you build this to our own size and connector?

Yes. The charge and discharge current can be customised and the dimension is made according to the device's request. Custom logo is available.

Can I get a sample first?

After price confirmation, you can request our battery samples to test.

Quote The 18650 lithium battery 3.7V 21Ah li-ion battery packs

Tell us the quantity, the delivery date you are working to and any change you need to the standard build.

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