You can't fully stop batteries from discharging, but you can do one simple thing across all battery types to lower the discharge rate: keep them cool. Whether you're trying to keep a lithium-ion or NiMH battery topped off longer, do your best to keep the battery cool. Cool within reason, of course.
The self-discharge rate merely depends on the type of battery and the environment where it is placed. According to Panasonic, if you want to slow down the battery discharge rate, you need to place them in a cold place, such as a refrigerator. Yes, you heard that right.
Mitigating battery degradation is critical for extending the lifespan of lithium-ion batteries, particularly in EVs and ESS. Here are several strategies to minimize degradation: Maintaining the battery charge between 20% and 80% is one of the most effective ways to prevent overcharging and deep discharging, which accelerate degradation.
Storing a battery in the discharged state can push it to the point where it won't recharge (usually because of safety features built into the battery or charger), and storing a battery fully charged can shorten its life by causing the battery to swell up -- which can even damage the device.
What you can do though is prevent unnecessary cycles by keeping devices plugged in and charging where possible. However, be smart about this, only leave things plugged in when they are in use and don't leave them on charge all the time as this can cause heat to build up, which itself will damage the battery.
One oddity you'll run into is the weak cells can get charged in reverse polarity, while the remaining good cells still will have a positive charge on them. That's why a battery seems to recover after its been discharged heavily, then allowed to rest for a period of time.
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