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How to store a cordless power tool battery and charger?

How to store a cordless power tool battery and charger

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Using a battery in a cordless power tool. Cordless power tool batteries are the most efficient when they are used regularly but, if you need to store them, follow these tips.
Keep cordless power tools, batteries and chargers separately during storage. Batteries, chargers and cordless power tools should be stored separately, not fitted together.
Store batteries and chargers in a cool dry place away from direct sunlight. Batteries and chargers need to be stored in a dry place out of direct sunlight and preferably at room temperature (15-21 degrees Celsius) but definitely not at any temperature extremes (below about 4 degrees Celsius and above 40 degrees Celsius).
Do not put the battery in the freezer however tempting it is. You might hear rumours that storing your battery in the freezer is good for it but Wonkee Donkee doesn’t advise this. Freezing your battery can permanently damage it.
Airtight containers are the best place to store batteries to keep them from getting moist condensation in them. The box or padded carrying case you purchased them in will protect them from dust and damage but an airtight container can be better because it doesn’t let condensation get into the battery cells.
Nails and small metal objects or filings can short circuit a battery so don't store them together. Do not store your battery in a place with any conductive materials like small metal objects such as paper clips or nails. If they touch the contacts and connect them together, they can short circuit the battery, severely damaging it.
Protective covers prevent dust and dirt getting into the contacts of batteries and chargers of cordless power tools. Some batteries and chargers come with a protective plastic cover which fits over the contacts and prevents them getting damaged during storage.
Cable or cord of charger should be coiled neatly to prevent damage during storing. Chargers should be stored unplugged with the power lead untangled, coiled and without any major weight on it. Use the plug to unplug the charger – avoid pulling on the power lead as it can damage the connections in the plug.
NiCd batteries can be stored at 40% or more but not below due to self discharge. NiCd batteries must be stored at 40% or more charge to avoid over discharge through self-discharging during storage. This is best for NiMH batteries too. Li-ion batteries can be stored at any charge level without damage.
One charge cycle every 6 months for lithium batteries and every months for nickel batteries. During long-term storage, Li-ion batteries should be recharged every 6 months and nickel-based batteries should be discharged and recharged once a month (one charge cycle) to prevent permanent damage through over-discharge.
Electrolyte needs to be redistributed throughout cell of battery after storage. Nickel-based batteries may need to be primed (conditioned) before use, after a long storage, to redistribute the electrolyte and optimise the battery capacity (see  How to prime a nickel-based cordless power tool battery).
You can use the lithium ion battery immediately after storage. Depending on how long they have been stored for, Li-ion batteries will usually have retained some of their charge and can be used straight from the shelf or recharged in the normal fashion.

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