12 Years’ Experience in Custom Solutions

Foundation in 2007, FUNSONG has been dedicated to provide the best custom lithium ion battery pack for worldwide users. 

And has accumulated rich experience in li ion battery field.


8 professional members in R&D Team

Funsong’s technical center covers  design, electronics, mechanism, software, electro-chemistry, power source, workmanship, measurement and control, signal processing and so on.


Served more than 518 customers in world

Funsong’s custom llithium ion battery packs were widely used in electronic tools, kids toy, small home appliance, e-bike, AGV, scooters, solar systems lighting  and 3C consumer products.


OEM & ODM available

we accept OEM & ODM orders, supplying the whole solutions batteries for all customers in world.


Customized Lithium  Batteries  Solution and Product Supplier

Since its foundation, Funsong  has been devoted to providing li-ion battery, VRLA battery, 18650 battery, BL-4C&5C battery products and technological service to global customers for more than 15 years. The design solutions are widely applied in electronic tools, kids toy, small home appliance, e-bike, scooters, solar lighting systems and 3C consumer products.

Appliacations: electronic tools, kids toy, small home appliance, e-bike, scooters, solar lighting systems and 3C consumer products.
Features The product solution is customized based on customer's diversification and individuation request.
The design solution is accorded with UL、CE、FCC、PSE、KC、BSMI、UN38.3、RoHS and relative standard.

How to Customize Lithium ion Battery Packs ?

Taking Project Management, technology innovation and elite team as basis, Funson’s custom li-ion battery products and solutions fully expresses its core competence in fast response, excellence, customization and after-sales guarantee. It creates more value for end users in the process of providing special-usage lithium ion battery products and solutions.


  1. Product Request Details: We need you to fill a Product Request Form, we check it and make sure it is complete and clear enough.
  2. Feasibility Evaluation and Project Launch: Project manager will organize the project team and evaluate its feasibility in aspects of EE, mechanism, software, electrochemistry, workmanship, quality and supply chain. Then, Feasibility Study Report will be released for the Project Manager’s approval for project launch.
  3. Product Design and Review Project Manager will organize R&D team to start product design including ID designer, mechanical engineer, EE engineer, battery engineer, software engineer.
  4. Design Verification and Review: Prototype sample to be made for verifications, including but not limited to schematic, PCBA layout, ID, mechanical design, software design, battery performance, sample making and test, problems and solutions, EB1, tooling fabrication, pilot run, sample full test and customer approval.
  5. Workmanship Verification and Pilot Run: We will follow Funsong’s Technical Manual, to draw up SOP which meets
  6. Product Certification Test: Samples will be submitted for overall tests according to Funsong’s Reliability Test Standard of Lithium ion Battery Products, in the meantime, to apply certification test as per customer’s request in authorized third-party Lab.
  7. Project Ending: To get customer acceptance, collect and store important documents and summarize loss and gain of the .
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