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The main issue with humidity is that condensation can build up between the terminals and in very wet conditions cause a short which could cause the battery to overheat and even catch fire. As an extra safety precaution the terminals should always have separate covers.

Not really. If you are storing lithium batteries for several weeks or longer they need to be kept at around 40-60% State of Charge. A trickle charge may cause over charge or under charge unless there was some kind of monitor built in.

Best voltage to store lithium-ion batteries

You would either need to purchase a battery charger which states the level of charge or a device (usually from the manufacturer of the battery) that could tell you this.

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Lithium-ionbattery storagetemperature

I have a lithium battery in my Motorhome and it is kept undercover in storage. The battery is discharging whilst in storage at about 10% per day. The battery is less than 2 years old. Is this ok? Or should I have the battery being charged with a liar blanket? Or does the discharge rate of 10% per day indicate it is a faulty battery?

No, the voltage of a battery stays fairly constant until it is close to complete discharge. It is difficult to reliably measure state of charge from voltage. You will need a specific product to read the state of charge of any particular battery.

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If they are lithium-ion batteries you don’t need to worry about self discharge over a short period of a few months. Lithium-ion batteries have very low levels of self discharge.

Lithium-ionbattery storagecapacity

Do I need to remove my golf cart lithium batteries in the winter when temperatures can go down to -30c if they are fully charged when I store the cart?

i have a scooter. with a lithium ion battery 40 volt, how do you determine the storage charge , the charger is a cheap one that only charges to max voltage

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Is it safe to storelithiumbatteries in the house

Lithium based batteries require extra attention as improper storage can cause units to overheat and potentially catch fire in a process known as thermal runaway. Many types also have both the negative and positive terminals on the same side making it easy to accidentally short out the unit on metal shelving if they are left uncovered.

“while tests have suggested that if this battery type is kept fully charged the recoverable capacity is reduced over time.”

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I don’t see how to maintain the charge. I’ve got maybe 8 different tools with batteries and chargers. If I let em sit over the winter they’ll discharge and if I leave them plugged in they’ll overcharge. Am I supposed to remember to periodically charge them every month?

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I have never been able to find such tests. Consumer products, including electric car batteries, laptops, solar systems never, ever mention this. The only place I can find this on the web is here and Battery University. Do you have ANY references to ANY real study which demonstrates this behaviour?

Lithium ion battery storageBag

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I’ve been trying to research a design to allow for my batteries to sit for a long period of time on a battery tender, to allow for longer shelf life, as needed. But it doesn’t seem like these systems exist or are impossible to find. I have a few 60 watt panels that I want to use to power the tickle charging system, each day there is enough sunlight to trickle 2-3 hours of charge at a minimum. So in theory, if I have a system set up like this for long term, I would house 200-300x 18650’s and have a longer shelf life due to their constant trickle charge each day. Or is this even correct?

This article relates to both Lithium batteries (also known as Lithium Metal non rechargeable) and Lithium Ion batteries (rechargeable) that are to be stored for several weeks or longer.

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When checking the voltage make sure the battery has not been charged or discharged recently, is at room temperature throughout and has been in a vibration free environment.  The best way to do this is to rest the battery at room temperature for at least an hour and a half.

All batteries gradually self-discharge even when in storage. A Lithium Ion battery will self-discharge 5% in the first 24 hours after being charged and then 1-2% per month. If the battery is fitted with a safety circuit (and most are) this will contribute to a further 3% self-discharge per month.

Are there any systems set up for specifically trickle charging 18650 packs or singles over a long period shelf life with solar charging options?

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Lithium batteries should be kept at around 40-50% State of Charge (SoC) to be ready for immediate use – this is approximately 3.8 Volts per cell – while tests have suggested that if this battery type is kept fully charged the recoverable capacity is reduced over time. The voltage of each cell should not fall below 2 volts as at this point the anode starts dissolving causing copper shunts to form which will cause an irreversible loss of capacity. Similarly lithium based batteries can be damaged by over charging which causes the cathode to decompose.

how to store lithium-ion batteries when not in use

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The higher the temperature the faster the battery will self-discharge but this is not an issue in itself so long as the correct State of Charge is maintained (see below). Temperatures below freezing will not damage Lithium batteries as they contain no water but they should be bought to above freezing before charging or usage to avoid damage.

If you Google “lithium battery state of charge for long term storage” you will find a number of sources. You will not find this mentioned on most consumer products because they intend the battery to be in use. This article really is focused on long term storage. I have updated the article to make this clearer.

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The following guidance is based on batteries that are kept at the right temperature, the right humidity and in the correct State of Charge. Under these conditions standard lithium based batteries can have a shelf life of up to ten years.  Military and Medical lithium based batteries can have a shelf life of up to twenty plus years.