7.4 V Lithium-ion Battery Pack
Explore 7.4V Lithium-ion Battery Packs, engineered with 2-series cell configurations for enhanced voltage and reliable output. Ideal for portable electronics, industrial instruments, medical devices, and security systems, these battery packs combine high energy density with stable performance. Designed for efficiency and longevity, iRay energy offers robust solutions tailored for your specific power needs.
FAQs
What are the main applications of a 7.4 V lithium-ion battery pack?
This type of battery pack is commonly used in drones, walkie-talkies, medical diagnostic instruments, wireless tools, smart robots, industrial handheld devices, surveillance cameras, portable printers, and model toys that require a 7.4 V operating voltage.
How is a 7.4 V battery pack made from individual cells?
It is usually composed of two 3.7 V nominal voltage lithium-ion cells connected in series. When fully charged, the voltage can reach 8.4 V, and the discharge cut-off voltage is typically around 6.0 V.
What is the approximate energy density of a 7.4 V battery pack?
The energy density is generally between 120–180 Wh/kg (gravimetric) and 220–280 Wh/L (volumetric), depending on the cell model and packaging technology.
Can two 3.7 V cells directly replace a 7.4 V battery pack?
Theoretically yes, but consistency must be ensured. A 7.4 V battery pack undergoes matching of voltage, capacity, internal resistance, and K value, and is equipped with a protection board and BMS to guarantee cell consistency. Simply connecting two cells directly poses significant risks.
What should be noted when charging a 7.4 V battery pack?
A dedicated 8.4 V CC/CV (constant current/constant voltage) charger should be used to avoid overvoltage or overcurrent. A regular 5 V USB charger cannot directly charge a 7.4 V battery pack.
Can a 7.4 V battery pack be customized based on application requirements?
Yes. The capacity (500mAh–20000mAh), size, discharge rate, connector type, and protection features can all be customized. Advanced options such as smart BMS or Bluetooth monitoring can also be added.
How does a 7.4 V battery pack perform under extreme temperatures?
The standard operating temperature range is –20℃ to +60℃. At low temperatures (e.g., –10℃), capacity may drop by 20–30%. For better low-temperature performance, low-temperature cells rated to –40℃ can be used.
What are the common protection features of a 7.4 V battery pack?
Common protections include overcharge, over-discharge, overcurrent, short-circuit, and temperature protection. Some advanced battery packs also feature balancing circuits, thermistors, and dual protection ICs to enhance overall safety.
