Proper Battery Storage

 Have you ever wondered if simply putting the battery in the fridge is the right way to store it and extend its life? We can answer that.


The recommended storage temperature for most batteries is actually 15 degrees Celsius (hence your fridge). The minimum temperature you need to store is minus 40 to minus 50 degrees Celsius. Lead acid should be fully charged during storage, but nickel and lithium-based makeup should be kept at approximately 40% charge (SoC) to minimize age-related capacity while still allowing the battery to self-discharge and remain in operating condition.

Achieving the magic 40% SoC is difficult because the battery's open circuit voltage (OCV) is difficult to calculate. It is best to use voltage as a crude energy indicator. The lithium-ion SoC is about 50% at 3.80V/cell and 40% at 3/75V/cell. Lithium-ion should rest for about 90 minutes after charging or discharging before checking the voltage.

SoCs for nickel batteries are the most difficult to determine. This is due to the flat discharge curve, the movement after charging and discharging, and the change in voltage as a function of temperature. There is really no convenient tool for evaluating nickel-based batteries. Since the charge state of the storage is not critical, just charge it slightly when the battery is empty (no, otherwise) and then store it in a cool, dry place.

Batteries always age through storage. On the other hand, an increase in temperature accelerates the permanent loss of battery capacity. Lithium-ion batteries in particular are often exposed to high temperatures; Think of how many people leave their phones or laptops in a hot place like the front seat of their car on a sunny day. In contrast, low temperatures and partial SoC slow down the aging process, but cannot stop it.

Another factor that shortens battery life is charging or maintaining the maximum charging voltage for a longer period of time. Batteries are like humans: they need to be able to relax after charging, even if they can stay afloat or jet.

Sealed lead-acid batteries can be stored for up to two years. However, it is important to monitor voltage or gravity and charge the battery if the battery drops to 70% SoC or less. Low charge causes an oxidizing layer on the negative plate and blocks current flow; this is known as sulfation, which can prevent small sealed lead-acid cells from loading.

Here are some basic guidelines to follow when storing your battery:

Remove the battery from the device and store it in a dry and cool place.

Lead acid must be filled before storage; Monitor voltage or gravity frequently and provide a boost if it drops below 2.10 V/cell or SG below 1/225.

Avoid freezing and remember that a battery with a weak battery freezes more easily than a non-free battery.

Alkaline and lithium primary batteries can be stored for up to ten years with moderate capacity loss.

Nickel-based batteries can be stored for five years or more even at zero voltage; then prime them before use.

Lithium-ion batteries must be stored in a charged state; 40% perfect. This ensures that the battery does not fall below 2.50V/cell when self-charging and remains idle. Discard if the voltage drops below 2.00 V/cell for more than seven days.

Following this simple guide will help you extend battery life and make better use of it. If you use a laptop rental company, ask the rental company how carefully they proceed; You don't want to rent a laptop that doesn't work when you need it most.

Remember to always handle batteries safely. Wear protective gloves when handling lead, cadmium, or electrolytes. If the battery is ever damaged during handling and you cannot avoid exposure, rinse it immediately with water and contact your doctor.

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