7.4 V 20 Ah Li‑ion Battery Pack (2S5P) with LI21700‑4000 mAh Cells, 5 A Protection Board, LM2596 5 V/3 A DC‑DC Output, Rocker Switch & 5.5 × 2.1 mm DC Connectors
Built from ten high‑quality LI21700‑4000 mAh cells in a 2S5P layout, delivering a true 20 Ah capacity at 7.4 V. Includes a 5 A BMS protection board for over‑charge/discharge and short‑circuit safety—perfect for continuous 1 C applications.
Versatile Output & Customization by Himax
Integrated LM2596 buck converter provides a regulated 5 V/3 A USB‑style output, plus a built‑in rocker switch and male/female 5.5 × 2.1 mm DC ports on 50 mm leads. Himax offers full custom services—specify alternate voltages, connector types, wire lengths, or enclosure finishes to match your exact requirements.
Specifications
Battery Manufacturer Direct Supply 7.4V 20Ah Cylindrical Lithium-ion Battery Pack for Portable Devices
Nominal Voltage
7.4V
Nominal Capacity
20Ah
Energy
148Wh
Charge Voltage
8.4V
Discharge cut-off voltage
6V
Charge Method
CC/CV
Standard Charge Current
4A
Max. Charge Current
10A
Standard Discharge Current
4A
Max. Continues Discharge current
10A
Cycle Life
300 times
Dimension
121*75*44mm
Weight
512g
Storage Temperature
-10°C~45°C
Frequently Asked Questions
Lithium ion battery pack answers, if you do not find the answer you are looking for, please contact us.
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1. Which cells and configuration make up this 7.4 V 20 Ah pack?
This pack uses ten LI21700‑4000 mAh cells (two in series × five in parallel) for 7.4 V nominal voltage and 20 Ah capacity, optimized for reliable 1 C discharge.
2. What protection features are included?
A 5 A protection (BMS) board safeguards against over‑charge, over‑discharge, over‑current, and short‑circuit events, ensuring safe operation under heavy loads.
3. How does the LM2596 DC‑DC converter work?
The onboard LM2596 module steps down pack voltage to 5 V at up to 3 A, providing a stable USB‑compatible output for powering smartphones, Raspberry Pi, and other 5 V electronics.
4. What connector and switch options come standard?
Includes a durable rocker switch and 5.5 × 2.1 mm male/female DC barrel connectors wired with 18 AWG (3135) leads, each 50 mm long. Custom lead lengths and connector types are available upon request.
5. Can Himax further customize this battery pack?
Yes—Himax supports comprehensive customization: choose different cell chemistries, adjust pack capacity or voltage, swap in alternative charge/discharge rates, and specify bespoke connectors, cabling, or enclosure colors.
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