How To Store Cordless Drill Batteries – Guide

Perhaps, you might face the problem regarding cordless drill battery like self-discharging and longer running of a cordless drill. All it needs extensive care not always during use rather when you don’t use it also. For this purpose, learn how to store cordless drill batteries safely and take an overview of it. Today, lithium batteries have become an integral part of our everyday lives – and for a good reason: They are tiny and efficient and therefore interesting for a variety of applications. Not only smartphones and tablets get their energy from lithium cells; They also play an important role in electromobility.

However, Lithium-ion batteries are a relatively new technology. Lithium energy storage systems score points here, among other things, with their high energy density, low weight, and fast charging technology. It is essential for a Lithium-Ion battery never to carry out deep discharges (<10%); otherwise, you will lose up to 20% of capacity at once! Too much discharge degrades the chemical components of the battery. Today the devices are powerful enough to switch off before the limit, so do not insist when the battery is dead, recharge it!

Always to increase the life of your battery, it is advisable (once or twice a month) to carry out a complete charge cycle, that is to say, to discharge it completely (without going below the critical threshold of 10%) and fully charge it without interruption. This complete cycle allows you to calibrate your battery. It is all the more important if you regularly perform short cycles.

Knowledge about keeping cordless drill batteries is necessary because of dangerous incidents in connection with lithium-ion batteries. No question about it: explosions and fires of lithium-ion batteries can have devastating consequences or, in the worst case, costing human life. Therefore, the urgent question of the safest possible handling and storage arises not only for private individuals but above all for companies. That’s why, In our practical guide, we take a detailed look at the potential dangers of lithium energy storage devices and give you some valuable tips on damage prevention.

Checklist On How To Store Cordless Drill Batteries

This checklist is a quick overview of how to store cordless drill batteries so check these points before installation of your cordless drill batteries:

  • Look Over Charging Status – Remove the battery from the cordless device. Check the charge status before storage and make sure that 2 LEDs light up on your battery. If necessary, remove dirt and dirt from the battery with a slightly damp cloth.
  • Keep An Eye on Temperature – A storage temperature between -10 and +50 degrees Celsius is best for the battery – dry basement rooms, the garage or a well-insulated shed are, for example, possible. 
  • Keep Charger Battery Separate – Store the charger separately from the battery at temperatures between +5 and +40 degrees Celsius.
  • Protect Lithium-Ion Batteries From The Weather – Store the battery in a closed box to protect it from moisture and sun.
  • Refrain From Children – Store your batteries in a safe place and keep them out of the reach of children.
  • Battery Storage Case – If possible, keep your power tool battery storage case.

Important Information For Cordless Drill Owners

Be Aware Of Outdated Battery Technologies With High Self-Discharge

Previously used battery types such as nickel-cadmium batteries (NiCd) or lead batteries used in motor vehicles show a high level of self-discharge: If a battery was not used for a long period of time, it could become deeply discharged.

Deep discharge means that the battery charge level drops below the end-of-discharge voltage. However, below this limit, no more energy can be made available and the battery may no longer be able to be charged and will cause irreversible damage. In the past, it was advisable to fully charge the battery before storing it for a long period of time and to check the charge level regularly.

Modern Battery Technology That Protects Against Total Discharge

Many famous cordless drill production brands like DeWalt, Bosch, Makita, relies on modern battery technology like lithium-ion batteries. Because Li-ion batteries show a negligible self-discharge of only one to three percent per year, which is quite better than past cordless drill battery technologies like NiCd.

Also, nowadays cordless drill batteries come up with an intelligent battery management system, also known as BMS. This monitors the voltage in every cell built into the battery and thus prevents deep discharge. If the voltage in the battery cells drops too much, it automatically switches to an idle state. The discharge process is interrupted. This also happens if the battery is not used for a long period of time. As a result, you don’t have to worry about damaging total discharge.

Always, keep in mind the number of charging cycles for the life of a battery, this corresponds to a complete cycle, that is to say, that you will need 2 charges/discharges of 50% to get a cycle.

I would suggest you go for a cordless drill with a Li-ion battery and most companies use it due to its low self-discharged.

The Optimal State of Charge for Storage

We recommend that you do not store batteries fully charged, but with 2 green LEDs. With this charge level, the battery can rest for 2 years without hesitation, and the aging and self-discharge of the battery are the least. Do not charge your battery until you are ready to use it for the first time. When charging, the temperature must be above 5 degrees Celsius. For better battery performance follow the following steps when charging cordless drill battery.

  1. Do not overcharge the batteries; it may cause a fire.
  2. Check the voltage of the pack before starting the charge. Never put them to charge if the voltage per element is less than 3.3V. Eg. In a 2-element battery (2S), the voltage of the pack must be higher than 6.6V to be able to charge them, in a 3-element battery (3S), it must exceed 9.9V, etc.
  3. Charge batteries in a safe area isolated from any flammable material.
  4.  The charging current you select on the charger is always equal to or less than 1 coulomb. That is, if you are going to charge a 2000 mAh pack, you must always configure a current less than or equal to 2 A (2000 mA).
  5. Let the battery cool down to room temperature before starting to charge.

Must read – How To Jumpstart A Cordless Drill Battery

Safety Tips – How To Store Lithium-ion Batteries 

These are the practical safety tips for the proper use of energy sources containing lithium. Follow these to be safe from any mishap.

  1. Use Specific Charger – Only use specific chargers for batteries containing Lithium.
  2. Monitor Battery Before Charging – Never charge lithium batteries without monitoring them.
  3. Can You Leave A Drill Battery Plugged In All The Time? – Pure NO.  Whenever you notice that a lithium battery swells or leaks liquid, unplug it immediately and observe it for 15 minutes in a safe place to prevent any abnormal reaction.
  4. Keep Battery’s terminal Away – Take care NEVER to bring the two battery terminals together, this short circuit could cause the battery to catch fire. Additionally, be very careful that the short circuit is not caused by connecting the terminals through rings or bracelets that you wear when handling them since serious injuries can be caused in this case.
  5. Keep Battery Alone After Giving Shock To It – A battery that has suffered a shock, short circuit or other problem can catch fire even 10-15 minutes after this event has occurred. Quickly take the battery to a safe place as described and observe it for 15 minutes.
  6. Carefully Remove Battery Terminal – If for any reason you have to cut the battery terminals, do so one by one so as not to risk causing a short circuit.
  7. Try To Keep In Normal Temperature – Never store your batteries in a vehicle or anywhere high temperatures can be reached. Extreme temperatures can cause battery fire also.

Also Read – Best DeWalt Cordless Drill Reviews

Points About Battery care

  • Carefully set the correct voltage and charging current on the charger for each pack from a guide.
  • Be very careful not to puncture any lithium battery pack; it may cause a fire.
  • Making a mistake can lead to a fire or deterioration of the battery.
  • Allow the lithium battery to cool to room temperature before starting to charge.
  • Never discharge a battery below 3V per cell; it may cause a fire and damage the battery.
  • When handling and charging lithium batteries, never exceed 71ºC in temperature.
  • Power tool battery storage temperature should be in the following ranges;
  1. During charging: 0 to 45ºC
  2. During discharge: 0 to 60ºC

The Bottom Line

Yet, It’s been covered almost all information and frequently asked related questions related to storing cordless drill batteries. However, I want to convey my perspective regarding how to store cordless drill batteries that always follow guidelines given with the battery or the above-given safety tips and checklist to keep away from injuries.

Until now, I got in this guide that protects lithium-ion batteries from environmental influences during storage. Always, when you sue it after delays, charge it for some minutes to activate its cells.

Important Question Related to How to Store Cordless Drill Batteries

Q: Can You Leave Battery In Drill?

When not in use, leave your battery with 40% charge capacity and store it in a cool place.

Q: When Is the Best Time to Recharge the Battery?

If you use your cordless tool again after a long period of time, only charge it shortly before use. This also saves capacity and has a positive effect on service life. The battery can only be charged at temperatures above 5 degrees Celsius. The charger monitors the battery temperature and prevents charging if the temperature is too low or too high.

Q: Should a Battery Be Fully Charged Before Storage?

In the past, a battery must be fully charged before it is stored. This was necessary because all batteries were prone to strong self-discharge. The result was irreversible damage such as a significant loss of capacity or even an unusable battery.

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