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FAQ Section
Frequently Asked Questions about Batteries
To maximize the cycle life of a battery, it is generally recommended not to exceed a depth of discharge (DOD) of 50%. This means it’s best to avoid discharging the battery below 50% of its capacity to help prolong its lifespan. Operating within this range can help extend the overall longevity and performance of the battery.
Temperature
Temperature can have a huge effect on the cycle life of a battery, as it affects the chemical reactions taking place within. The optimum temperature for a battery is 25°C. Should the battery experience temperatures higher or lower than this figure, it can suffer from capacity loss.
Currents
Now we move onto the currents. Quite simply, higher currents usually cause more heat to be generated and more stress on the battery, so it won’t surprise you to read that this can have a negative effect on the life cycle of a battery.
DoD/Voltage window
It is not recommended to charge batteries from 0% SoC to 100% SoC,
as this will adversely affect the cycle life. Instead, batteries should be charged from something like 20% to 80%. This can be done by the user, or alternatively, the manufacturer of the BMS can build this feature into their product.
Battery age
This age of a battery also affects life cycle. Older batteries can have
a shorter cycle life due to self-discharge and parasitic reactions. This means that batteries stored for a long time before being used will have a lower cycle life.
End of life threshold
The End of Life threshold is set by the manufacturer and is usually somewhere around 60-80% of initial capacity. If one producer defines
the EoL as 70%, it will probably have a higher life cycle than if it had been defined as 80%.
It is not always the case that the battery needs to be replaced when
it reaches its EoL. It can continue to be used, but will have limited performance, which will further deteriorate over time. On the other hand, batteries can fail earlier than expected, especially if misused, mechanically stressed, or stored outside their recommended conditions.
Battery management system (BMS). The BMS monitors and controls the charging and discharging of the batteries, ensuring performance, safety, and longevity. Often, the BMS can communicate with the device using the battery for optimal effectiveness.
Not all batteries have built in BMS – for example, batteries used in small electronic devices often don’t have one. But a BMS is recommended in many situations. There are many to choose from, and the best way to choose which to use for your application is by liaising with a knowledgeable expert – such as the people here at Johnson Matthey Battery System.
As an update to this video, our batteries come with a 10-year warranty (8-year full replacement manufacturer’s defect warranty and 2 years prorated).
They are designed to last 3000 – 5000 cycles, at which point the battery will still hold 75 to 80% of its energy capacity.