Your OEM / ODM engineering partner
Battery packs and chargers. Built around your device.
OEM / ODM engineering, from your first requirements to samples, testing and production.
In-house engineering · Small-quantity orders accepted
- Engineering
- Battery packs & chargers
- Development
- Circuits & prototypes
- Validation
- In-house Battery Lab
- Production
- ISO 9001 manufacturing
- Quality
- Testing & traceability
PRODUCTSBattery packs & chargers
See the products behind the engineering.
Battery-pack formats and two charger designs, shown in real product photographs. Explore the physical format before discussing your project requirements.
Sheet 01 Battery PCB · protection circuitRedrawn from our battery PCB design
Three-level protection circuit (redrawn from our battery PCB design)
01How protection is engineered
A closer look at battery protection
Explore an example of our battery PCB protection design. Use Next to explore the protection circuit.Use Next to explore the protection circuit.
11st protection
Protection IC + MOSFET
A Japanese protection IC checks for over-charge, over-discharge and over-current, and controls a MOSFET on the P− line.
22nd protection
PTC
A PTC sits in series on the P+ output line as a separate, second level of protection.
33rd protection
Second protection IC + MOSFET
A second Japanese protection IC adds its own over-charge protection, with its own MOSFET on the P− line.
P±Output
To your device's P+ / P− contacts
Three levels stand between the cell and your device. We design this battery PCB to fit your pack and device.
1 of 4
02Project path
From your requirements to a tested, traceable shipment
Six stages. Select each one to see what we do, what we need from you, and the equipment or record behind it.
Stage 01 of 06
Requirements
Tell us what the pack or charger has to power and where it has to fit.
What CHYI FENG does
- Our in-house engineering team reviews your device and how it is used.
- We list what is needed to start the design and help you fill the gaps.
- We tell you which certification documents exist for certified models, on request.
What you provide
- The device or application
- Voltage and capacity, or the runtime you need
- Size limits and the connector or contacts
- Whether you also need a charger
- Quantity stage: prototype, pilot run or production
- Unknown values are fine. We work them out with you.
01Project checkpoint
Define the interface
- Device & application
- Space & connection
- Runtime & charging
Discuss your project with our engineering team.
Stage 02 of 06
Circuit design
We design the battery PCB (protection circuit) and the charger PCB in-house.
What CHYI FENG does
- Battery PCB with three levels of protection: Japanese protection IC + MOSFET (1st and 3rd), PTC (2nd).
- Protection IC for over-charge, over-discharge and over-current.
- Fuel gauge (gas gauge) for smart batteries when your device needs it.
- Charger PCB designed to match your pack.
What you provide
- Charge and discharge needs of your device
- Connector pin-out or contact layout
- Whether the battery must report its charge level (fuel gauge)
- Standards your market requires
Stage 03 of 06
Prototype
We build prototype packs and chargers so you can check fit and function in your device.
What CHYI FENG does
- Prototype packs and chargers built in our own production.
- Small quantities accepted, so samples and pilot runs are possible.
- Design changes made after your feedback, with quick, flexible production.
What you provide
- Fit and function results from your device
- Changes you need before validation
03Project checkpoint
Review the sample
- Fit in your device
- Check the connection
- Confirm your requirements
Discuss your project with our engineering team.
Stage 04 of 06
Battery Lab validation
Our in-house Battery Lab has equipment for the UN 38.3 test items T1 to T8, plus an explosion-proof test chamber.
What CHYI FENG does
- T1Altitude simulation
- T2Thermal
- T3Vibration
- T4Shock
- T5External short circuit
- T6Crush / impact
- T7Overcharge
- T8Forced discharge
Plus an explosion-proof test chamber. Certification documents for certified models are available on request.
What you provide
- The markets you sell into
- The standards or documents your customers ask for
Stage 05 of 06
Production
Products are manufactured under ISO 9001, and every product carries a printed traceability code.
What CHYI FENG does
- Incoming materials and cells are tested before production.
- Manufacturing under ISO 9001.
- A printed code on every product records who built it, which process step and the date code.
- Small-quantity and flexible production.
What you provide
- Approved sample and final specification
- Order quantity and delivery schedule
- Label or marking requirements
| Who built it | Each worker has a code |
|---|---|
| Which process step | Each process step has a code |
| Which product | Each product has its own code |
| When | Date code |
Stage 06 of 06
QC report & shipping
Every battery pack is tested, and a QC test report ships with every shipment.
What CHYI FENG does
- Every battery pack tested before packing.
- QC test report included in every shipment.
- Packed to SOP in export cartons.
- Express shipping to the US and Europe by UPS or FedEx.
What you provide
- Ship-to address
- Preferred carrier: UPS or FedEx
06Project checkpoint
Release with records
- Battery-pack testing
- QC report with shipment
- Packing to SOP
Discuss your project with our engineering team.
01Product families
Starting points you can customize
Explore a battery family or charging configuration. The final design starts with your device and requirements.
Capability A · Battery
Custom battery packs
Packs built around your device: cells, size, connector and protection circuit.
Capability B · Battery
Smart batteries
Battery packs with a fuel gauge (gas gauge) that reports the charge level.
Capability C · Battery
Backup batteries
Small NiMH or lithium cells with leads, for memory backup.
Capability D · Battery
NFC batteries
Battery packs with NFC. Tell us your device and we confirm what is possible.
Capability E · Battery
E-bike batteries
Battery packs for e-bikes, from the same engineering team and lab.
Capability F · Charger
Single-bay chargers
One pocket, matched to your pack and its contacts.
Capability G · Charger
Dual-bay and 4-bay chargers
Two or four batteries charged in one base.
Capability H · Charger
6-bay and multi-bay chargers
Larger chargers for fleets of devices, with our own charger PCB.
04Proof you can check
Engineering backed by testing and records
Ask for any of these when you evaluate us as a supplier.
In-house Battery Lab
Equipment for the UN 38.3 test items T1–T8 and an explosion-proof test chamber.
See the test equipmentTESTRECORDSHIP
QC report with every shipment
Every battery pack is tested. The QC test report ships with the goods.
See QC and packingWorkercodeStepcodeProductcodeDatecode
Traceability code
Each worker, each process step and each product has its own code, printed with the date code.
How it works- UL
- UN 38.3
- CE
- IEC 62133
- IP67
- BSMI
- PSE
- IEC 61960
- UL 2054
05Start a project
Send your specs, even the ones you don't know yet
The spec brief builder turns your requirements into a clean summary you can email to our engineers. Leave blank anything you are not sure about.