603040 3.7V 680mAh LiPo Battery for Compact Devices

The 603040 is a 3.7V 680mAh LiPo battery for compact rechargeable electronics. It provides 2.52Wh of nominal energy and can be adapted to different device designs.

Choosing the battery is only the first step. You also need to check battery space, device current, wiring, connector, charging system, and certification needs. The points below can help with the design process.

Part 1. Is the 603040 right for your battery space?

Start with the real battery compartment. Do not select a battery by capacity alone. The finished battery, wires, connector, and protection parts all need space.

• Leave enough space around the pouch battery.

• Check the wire exit direction before fixing the battery position.

• Make sure the connector can be inserted and removed easily.

• Keep sharp ribs, screws, and hard edges away from the battery pouch.

A small change in battery thickness or wire position can affect assembly. It is better to confirm the battery drawing before the device housing is fixed.

Part 2. How long can a 680mAh battery run your device?

Battery runtime mainly depends on the average current used by the device. A simple estimate is:

Runtime (hours) ≈ 680mAh ÷ average current (mA)

• At 50mA: about 13.6 hours in theory.

• At 100mA: about 6.8 hours in theory.

• At 200mA: about 3.4 hours in theory.

Actual runtime is usually lower. Standby power, peak current, temperature, and system losses all affect the result.

Part 3. Check the real device current before selection

Average current is useful, but it does not show the full load. Many devices use different current levels during startup, communication, standby, or motor operation.

• Average current: affects total runtime.

• Peak current: affects voltage drop during short high-load events.

• Standby current: matters for products that stay idle for long periods.

• Duty cycle: shows how often the device enters each power mode.

For a new project, test the current profile on the real device. Then confirm that the battery can support the required load.

Part 4. Plan the connector, wire, and protection design

The battery connection should be planned early. Connector type, polarity, wire length, and wire direction can all affect final assembly.

• Connector: choose a type that matches the device socket.

• Polarity: confirm positive and negative positions before production.

• Wire length: allow enough length without creating extra loops.

• Wire gauge: choose it according to the required current.

• Protection: confirm whether the project needs PCM and temperature sensing.

The charger should also match a 3.7V single-cell rechargeable LiPo battery. Final charging settings should follow the approved battery specification.

Part 5. What do KC and UL/TÜV mean for the 603040?

The 603040 has KC and UL/TÜV certification coverage. These documents can help when the battery is used in projects with specific safety or market requirements.

• KC: supports applicable battery requirements for the Korean market.

• UL/TÜV: provides third-party battery safety evaluation.

Always check the exact certificate, model scope, and target-market rules before mass production. The battery certificate and the final device approval are not always the same thing.

Part 6. Test the 603040 inside the final device

A battery may work well on a bench but behave differently inside the finished product. Final testing should use the real enclosure and normal device functions.

• Check actual runtime.

• Check voltage during the highest load.

• Check charging time and battery temperature.

• Check standby power use.

• Check the wire and connector after final assembly.

The stated discharge range is -20°C to 60°C. Very low or high temperatures can change available capacity and runtime.

Part 7. What should be confirmed before mass production?

Lock the battery specification before placing a production order. This helps avoid connector, wiring, and assembly changes later.

• Battery model and approved drawing

• Connector model and mating connector

• Wire length, gauge, color, and polarity

• PCM and optional NTC requirements

• Wire exit direction and installation space

• Label and marking requirements

• KC, UL/TÜV, and other required project documents

If the standard 603040 does not match your device, the connector, wire, protection design, and other integration details can be reviewed for an OEM project.