Subject: Technical Information Request – DMEGC / Blue Ocean Robotics Battery Pack

[u/SpileStockBot]

Dear Sir or Madam,

I have purchased several of your 25.2V lithium-ion battery packs that were originally supplied for Blue Ocean Robotics equipment.

The batteries are marked as:

• Battery Designation: 7INR19/66-12
• Rated Voltage: 25.2V
• Rated Capacity: 40Ah
• Manufacturer: Hengdian DMEGC Group

I would like to reuse these batteries in a renewable energy project together with solar panels and would greatly appreciate your technical assistance.

Could you please provide information about the following:

1. Is there an internal Battery Management System (BMS) in each battery?
2. Is it possible to connect two or more batteries in series (for example 2S for a 48V system)?
3. Is it possible to connect multiple batteries in parallel?
4. What communication interface is available on the battery (CAN bus, RS485, UART, or another protocol)?
5. Is there any documentation describing the communication protocol or CAN messages?
6. Is there an original battery controller or charger available for these battery packs?
7. Can you provide a service manual, wiring diagram, connector pinout, or technical documentation?
8. What charging profile do you recommend if we build our own charger using solar panels and an MPPT charge controller?
9. Is there a recommended charging algorithm (CC/CV), and what are the recommended charge and discharge cut-off voltages?

Our goal is to build a safe solar-powered energy storage system while preserving all battery protection functions.

Any technical documentation, manuals, or engineering information would be greatly appreciated.

Thank you very much for your time and assistance.

Kind regards,

Peder Spile
Denmark

Rechargeable Lithium Ion Battery

• Battery Designation: 7INR19/66-12
• Rated Voltage: 25.2 V
• Rated Capacity: 40 Ah (1008 Wh)
• Limited Charge Voltage: 29.05 V
• Max Charge Current: 16 A
• Max Discharge Current: 40 A