Learn how to store your rechargeable batteries
Storing batteries good will help you maximize their durability and energy for you to use. Different types of batteries require various storing ways. With regard to rechargeable batteries, experts claim that if we do not store them we will be easy to be damaged during using period and not able to ultimate their effectiveness for your devices, as the result. Understanding the importance of how to store your rechargeable batteries, we collect some good ideas and introduce you.
There are several main points for us to consider how to store batteries including temperature and state-of-charge conditions.
- The storage temperature varies according to the type of battery. For most of batteries, the recommended storage temperature is –40°C to 50°C for most chemistry. Nickel and lithium based batteries should be kept at around 40 percent state of charge while lead acid batteries must be stored at full charge during storage. When you are able to consider this item, you can minimize age-related capacity loss. Meanwhile, it is possible to keep the battery operational but still allowance of some self-discharge.
- Li-ion batteries require above 2V/cell to dip for any length of time and nickel-ones can be stored in a fully discharged state without any effect of apparent side. For Li-ion based batteries, copper shunts form inside cells, leading to the status of elevated self-discharge or even partial electrical short. If the cells are recharged, they might be unstable and cause excessive heat, resulting in potential damage. As the last introduction of the li-ion batteries, they are able to suffer stress but more sensitive to mechanical abuse. During the using time, you can ask for help of the manufacturer when a fault could happen for improper use or handling.
- To get the correct temperature after a charge or discharge of any battery, you should rest it for 90 minutes before reading. The common standard of temperature is discharging to 3.77V/cell or 3.87V/cell at C-rate should be at 1C or less. The rubber band impact will set the voltage at 3.82V and shows the typical discharge of voltage of a li-ion battery.
- Regarding the state of charge, we have to consider discharge voltage. You have to know that battery SoC will reflect in OCV thus, temperature previous charging and discharging will strongly affect the reading. As we mentioned, to correctly reading, you need to keep the battery resting for 90 minutes before taking it for the task.
- Also, measure SoC is not simple at on in case of nickel batteries. The voltage is affected by discharge curve, agitation after charging and discharge process as well as temperatures. Also, for this duty, the charge level for storage is not serious. Simply, you can apply some charge when the battery is empty and store it in a dry and cool place. For some charge, priming is faster than it when being stored in a totally discharged state.
- The results of storages will be two forms of losses including self-discharge and non-recoverable. The former can be refilled if charging before using while the latter will be at permanently lower the capacity. Capacities of lithium and nickel batteries are remained after a year of storage. Li-ion based batteries usually have higher losses if you store them fully charged than at 40 percent.