12.8V 4Ah Custom LiFePO4 Battery Pack | 26650 4S1P

Four 26650 Cells in a Slim 12.8V Pack

This 12.8V 4Ah custom LiFePO4 battery pack uses four 26650 cells in a 4S1P arrangement. The 4000mAh capacity corresponds to 51.2Wh of calculated nominal energy. Its long, narrow blue-wrapped body is supplied with red and black leads and a white two-pin connector.

The supplied parameter sheet lists a 28 × 55 × 135mm envelope and 360g reference weight. Allow additional clearance for the connector, cable bend and mounting support when reviewing the battery compartment.

Datasheet Values for LFP26650-4S1P

Values follow the supplied product parameter sheet. Confirm the ordered layout, dimensional tolerances and harness drawing for production.

Electrical Strengths of the 26650 4S1P Build

• 4Ah capacity and 51.2Wh nominal energy. Use the expected equipment load to establish a runtime target, then validate it with a sample.
• 26650 4S1P cell arrangement. The stated series and parallel configuration identifies this build when comparing drawings and power requirements.
• 5A maximum discharge entry. Review sustained demand and startup current separately; the 15A instantaneous entry has no stated duration in the supplied sheet.
• Defined physical envelope. The reference dimensions and 360g weight support initial enclosure and mounting review.

How This Build Differs from Its Siblings

The 6.4V 12Ah 32700 2S2P pack provides a different combination of voltage, capacity and installation size. It is specified at 76.8Wh nominal energy, with a 65 × 65 × 74mm / 33 × 129 × 72mm reference envelope. Compare the device voltage range, load and available space before choosing between builds.

The 12.8V 80Ah 32700 4S13P pack provides a different combination of voltage, capacity and installation size. It is specified at 1024Wh nominal energy, with a 318 × 144 × 148mm reference envelope. Compare the device voltage range, load and available space before choosing between builds.

Duty, Charge and Operating Limits

• Charging current. The stated maximum is 2A. Confirm the required charge voltage, charging profile and termination conditions for the ordered LiFePO4 configuration.
• Discharge current. The sheet lists 5A maximum discharge current and 15A maximum instantaneous discharge current. Pulse duration, repetition and recovery conditions must be agreed before using the instantaneous rating.
• Other operating limits. Charge and discharge temperature ranges, cut-off voltages, protection thresholds and cycle-life test conditions are not supplied in this parameter summary. Obtain them for the selected build during technical review.

Connecting the Power Leads

The photos show a white two-pin connector. Its series, pin assignment and cable length are not identified in the parameter sheet, so confirm these details against the mating harness and approved drawing.

1. Check the approved harness drawing and verify polarity before connection.
2. Match the termination and cable routing to the equipment load and enclosure.
3. Provide mechanical support and strain relief; keep the battery wrap clear of sharp edges.
4. Confirm charger compatibility and any host sensing or protection requirements before sample testing.

Devices That Match This Discharge Profile

Potential uses include portable instruments, lighting controls, monitoring devices and compact OEM equipment designed for a four-series LiFePO4 supply. Confirm that the operating current fits the 5A maximum discharge entry and that startup demand meets the separately approved pulse conditions.

Technical Support & Model Matching

Send Surlon Power the device voltage range, average and peak current with durations, runtime target, battery-compartment drawing, harness requirements and charging arrangement. Review the proposed specification and sample with your equipment before production approval.

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