Lithium Battery for Electricity Needs!

Active Balancing

Active BalancingActive Balancing

Remote Monitoring

Remote MonitoringRemote Monitoring

Fast Charging

Fast Charging



Customized Lithium Battery

Customized Lithium BatteryCustomized Lithium Battery

German Engineering

German Engineering

Higher Returns

Higher Returns

Long Battery Life

10 Years Life*10 Years Life

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Energy Efficient Energy Efficient

Cost Effective Cost Effective

Zero Blackouts Zero Blackouts

Green Solutions Green Solutions

Maintainence Free Maintainence Free

Energy Independence Energy Independence

Reduced Carbon Footprint Reduced Carbon Footprint

Customized Energy Storage System Customized Energy Storage System

Recycle Lithium Ion Battery

Available Ranges

lithium battery 840 Wh 840 Wh

lithium battery 1.4kWh 1.4 kWh

lithium battery 2.1kWh 2.1 kWh

lithium battery 2.8kWh 2.8 kWh

lithium battery 4.2kWh 4.2 kWh

lithium battery 5.6kWh 5.6 kWh

lithium battery 8.4kWh 8.4 kWh

lithium battery 14kWh 14 kWh

*Serial scalable for higher voltages

*Parallel scalable for higher capacities



Parameter Diesel Generator Lead Acid Battery Joulie
Efficiency Low about 25% Low about 60% As high as 95%
Energy Cost High High Low
Weight Bulky Bulky/ Heavy Weight Lighter Weight
Sound Emission Noisy Silent Silent
Space Requirements Large Space Large Space Very Handy
Life Cycle X Lesser Life Cycle 10 Years life (4000 cycles*)
Pollution Yes Yes Green
Vested Interest Yes (Diesel Theft Possible) Yes (Lead Theft Possible) No vested interest
Repairs Frequent Repair Frequent Replacement Long Life
Remote Monitoring X X Remote Monitoring Possible
Operating Temperature - 25°C to 35°C -25°C to +50°C [-13F to 122F]
Interface - - Active balancer, Relay Trigger, Single Cell Monitoring
Charging Time - Long Charging Time (Min 8Hrs) Shorter Charging Time (2~3 Hrs)
Operational Cost Yes Yes No
Plug & Play Ability - - Yes
Maintenance Yes Yes No
OTA Support - - Yes (Firmware Upgrades Over The Air)



Capacity 840 Wh / 60Ah 1.4 kWh / 100Ah 2.1 kWh/ 150Ah 2.8 kWh/ 200Ah
Voltage 12V
Max. Charge/Discharge Current 60A 100A 150A 200A
BMS Active Balancing
Interface CAN, CANopen For Standard Inverters
Remote Monitoring Yes
Extendable Yes
Cell Type LiFePO4 High Performance Cells
Cycles 4000
Dod Max. 80%
Efficiency 95%
Operating Temperature -25°C to +50°C [-13F to 122F]

Capacity 4.2 kWh / 300Ah 5.6 kWh / 400Ah 8.4 kWh / 600Ah 14 kWh / 1000Ah
Voltage 12V
Max. Charge/Discharge Current 300 A 400 A 600 A 1000 A
BMS Active Balancing
Interface CAN, CANopen For Standard Inverters
Remote Monitoring Yes
Extendable Yes
Cell Type LiFeYPO4 High Performance Cells
Cycles 8000
Dod Max. 80%
Efficiency 95%
Operating Temperature -25°C to +50°C [-13F to 122F]



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1.Is this really maintenance free?

Yes, Joulie is absolutely maintenance free, you don’t have to add any sort of battery water or clean the terminals.

2. What does One Cycle mean?

A charge cycle is the process of charging a rechargeable battery and discharging it as required into a load.

3. Will this battery be safe to install at home?

Yes Joulie is absolutely safe to install at home and is non-flammable as well as non-explosive. Some model are available with wall mounting features to save space.

4. Do I have to use this battery system daily?

No, You can leave the Joulie unused to a period up to 6 months safely, the battery charge or condition will not deteriorate.

5. Does it have any protection?

Yes, Joulie comes with inbuilt protections like over voltage, under voltage, over current, under currents, fault detection. The system automatically disconnects in case of any faults so that all your appliances, home, shops, industry is absolutely safe.

6. What is remote monitoring of the battery?

Joulie is the first Internet Ready battery which comes with a remote monitoring feature which helps you know the health of the battery, state of charge and many other parameters. Also gives a warning on faults!

7. How can I charge the battery?

Joulie can be charged by solar power, wind power, grid, and/or any dc source of the appropriate ratings.

8. Can I get custom sizes as per my requirements?

Yes, custom size are available on special requests, you can write to us on sales[at]vmechatronics[dot]com

9. How much time does it take to charge these batteries to full capacity?

Joulie can be fully charged in 2-3 hours.

10. How much time can we discharge?

A full capacity of Joulie can be discharged in one hour.

11. Is it programmable?

Yes, Joulie is programmable to suit your requirements.

12. Does this emit any fumes or pollutants?

No, Joulie does not emit any fumes or pollutants, it is completely eco-friendly & green product.

13. Do I have to add battery water to this every month?

No, You will never have to add battery water to Joulie.

14. Are these batteries recyclable?

Yes, Joulie is recyclable and has a second life too.

15. Can they sustain hot and humid climate of India?

Yes, Joulie can sustain Indian weather conditions. It can operate in temperatures from -25°C to +50°C.

16. How much space will these batteries require?

Joulie is very compact and does not require a lot of space, some models are even wall mounting.

17. Where have these batteries been installed till date?

Joulie has been installed in India, Germany, United Kingdom and running successfully.

18. After how many years should I replace these batteries?

The life expectancy of Joulie is 10 years* (4000 cycles @ 80% DoD), so install Joulie and forget replacement headache for the next 10 years.