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Technology and product overview


Flow of zinc/manganese oxide secondary battery
(high-performance battery) development


Tokyo Institute of Technology Yamamoto Laboratory develops prototype of zinc/manganese oxide secondary battery.
It became possible to charge and discharge, but the number of cycles is about 30 times.


10 years later


The Kim & Oh team at Seoul National University in South Korea will continues to research electrolytes.
Succeeded in extending the charge/discharge cycle up to 120 times.


14 years later


The Kang team of Tsinghua University, China presented a paper. Get noticed at once.
However, the principle is extremely complicated and has not yet been elucidated.



The Sakata-Furutsuki Laboratory of the University of Tokyo investigates the principle of zinc/manganese oxide secondary batteries. Succeeded in extending cycle durability to over 10,000 times with newly developed technology.

Some of the research results have already been published in the journal of the Royal Society of ChemistryJournal of Materials Chemistry A  has been announced in


Realized super-large size because it does not use anything that may catch fire or explode.


Realized super-large size because it does not use anything that may catch fire or explode.

Realized super-large size because it does not use anything that may catch fire or explode.

Japan Volta Zinc Manganese Oxide Secondary Battery

[Battery single cell specifications]

1. Manufacturer

Japan Volta Co., Ltd.

2. Anode material

manganese oxide

3. Cathode material


4. Model


5. Dimensions

H140×D30×W220 (mm) *Temporary  

6. Rated capacity

3.9V x 50,000mAh = 195W

7. Nominal voltage

3.9V (Upper limit voltage during charging: 5.1V, Lower limit voltage during discharging: 2.7V)

8. Current value

Maximum charging current 250A (5C) or more, maximum discharging current 250A (5C) or more

9. Mass

1.5 kg *Temporary

10. Temperature range

-10°C to 60°C when charging, -20°C to 60°C when discharging

11. Electrolyte

Weakly acidic aqueous solution (ph4.5)

12.Number of cycles

5C, DOD: 0%-100%, 10,000 cycles or more at 20℃

13. Authentication

Scheduled to acquire UL/CE certification (for battery cells)

*The above data is subject to change without notice.


[BMU-M design concept]
A description of the concept related to the design and selection of the BMU-M.

1) Control characteristics: We specialize in charge/discharge characteristics of zinc/lead manganese oxide batteries made by Japan Volta.

2) BMU master board basic specifications

charge management

Using a charger (CC/CV method) manages the full charge of the assembled battery to avoid overcharging

Discharge management

Manages the overdischarge avoidance of the assembled battery according to the voltage behavior characteristics during discharge

Balance to cell voltage

Balancing the voltage difference between battery cells (series system)


temperature control

Monitors temperature changes and controls circuits such as main circuit shutdown to protect the battery when the temperature is high or low

SOC estimation

Estimates the charge amount of the assembled battery using a unique calculation method

*SOC: State of Charge,  CC : Constant Current,  CV : Constant Voltage 

3) BMU slave board basic specifications
・Periodically monitor the operating status of battery cells obtained from electronic devices for measurement, and the status of thermistors and thermal fuses.
・The monitored data is sent in response to periodic requests from the BMU master board.
・When an instruction from the BMU master board or detection of communication interruption with the BMU master board is detected, the main circuit of the unit is cut off.
・According to the instruction from the BMU master board, activate the element for voltage balance control between battery cells.


Product line-up

[container system(40feet type)]

container system(40feet type).png

[container system(20feet type)]

container system(20feet type).png

[Estimated power supply]

《What is the amount of electricity per day in a general household? 》

・LED lighting (40W)   : 5 hours/200W
・Refrigerator (438kwh/year): 24 hours/1200W
・Portable charger (15W): 5 hours/75W
・TV (150W): 3 hours/450W
・Computer (100W): 6 hours/600W
・Washing machine (250W): 2 hours/500W
・Rice cooker (1300W): 1 hour use/1300W
・Microwave oven (1000W)  : 30 minutes use/500W
・Air conditioner (700W): 3 hours/600W
Total 5425W

《How many households can be supplied per day with one container?》

1950000W÷5425W≒360 houses

[Estimated time until full charge]

《Approximate Time to Full Charge》

500 KW output・・4 hours
1 MW output・・・2 hours
2 MW output・・・1 hour
4 MW output・・・30 minutes
10 MW output・・ 12 minutes

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