803560-2P Rechargeable 3600mAh Battery with 1S2P Design

The Ufine 803560-2P is a 3.7V 3600mAh rechargeable LiPo battery pack. It stores 13.32Wh of nominal energy and uses two cells connected in parallel.

For this pack, capacity is only part of the selection process. The device supply voltage, power use, charging circuit, and sample results also matter. Use the points below to assess your project.

Part 1. What does the 803560-2P parallel design change?

The 1S2P configuration combines two cells in parallel. This adds their capacity while keeping the nominal voltage at 3.7V. It does not create a 7.4V battery.

• Pack capacity: 3600mAh for the complete assembly.

• Pack voltage: 3.7V nominal, with a 4.2V charge limit.

• Pack output: limited by the cells, PCM, wires, and connector together.

Two parallel cells do not mean any load can be doubled. Use the approved finished-pack current rating when choosing the battery.

Part 2. Can the 803560-2P power a 5V device?

A device that needs a fixed 5V supply requires a suitable boost circuit. The battery voltage changes during use. The circuit must support the device across the approved battery voltage range.

Compare energy in Wh when the battery and device use different voltages. A simple estimate is:

Runtime (hours) ≈ 13.32Wh × converter efficiency ÷ device power (W)

• Example device load: 5V at 400mA equals 2W.

• Assumed converter efficiency: 85%.

• Estimated runtime: 13.32 × 0.85 ÷ 2 ≈ 5.7 hours.

This estimate assumes the full nominal battery energy is available. Actual runtime depends on converter losses, temperature, battery age, and the device's shutdown voltage.

Part 3. Test demanding tasks near the end of a charge

A full battery may handle a task that causes a reset at a lower charge level. Test startup and the highest-load functions before the device reaches its normal shutdown point.

• Run motors, radios, lights, or speakers in their highest-load mode.

• Measure the current drawn from the battery pack.

• Record the lowest pack voltage during each task.

• Note any reset, early shutdown, or protection trip.

If a problem occurs, share the current peak and its duration. A higher-capacity pack alone may not solve a peak-load problem.

Part 4. Choose a charger for the complete 803560-2P pack

Although the pack contains two cells, its 1S2P design uses a single-cell Li-ion charging voltage. Use a compatible CC/CV charger with a 4.2V limit. Do not use a 7.4V battery charger.

• The listed standard pack charge current is 720mA.

• Confirm the final charge current against the approved pack specification.

• The standard pack has no NTC sensor. Review this if the charger needs temperature sensing.

• The PCM provides protection. It does not replace the charging circuit.

At 720mA, capacity divided by current gives five hours. This is a rough estimate, not a full-charge time. Current falls during the final charging stage, so charging can take longer.

Part 5. Compare a two-cell pack with a single pouch battery

A single pouch battery may offer a different shape from the 803560-2P. Compare the complete assemblies using the same device requirements.

• Compare usable energy and measured runtime.

• Compare finished size, weight, and mounting needs.

• Compare current limits and voltage drop under load.

• Compare protection, wiring, and connector details.

A bare cell and a protected pack are different supply options. Include the space and cost of protection, insulation, and wiring when comparing them.

Part 6. Keep a clear 803560-2P sample approval record

Test samples in the finished device. Keep the device settings and test conditions the same so the results can be compared.

• Record the pack version and drawing revision.

• Record the charger settings and starting charge level.

• Record temperature, device modes, and time spent in each mode.

• Measure runtime, startup behavior, and charging temperature.

• Define the end point, such as the device's low-battery shutdown.

Send the results with your runtime target and any issues found. This gives us a clear basis for reviewing the standard pack or changes to its assembly.