Dewalt Cordless Batteries and Chargers FAQs

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Dewalt Cordless Batteries and Chargers FAQs

1. Is it better for DEWALT
batteries to be completely discharged before charging?
No. Just the opposite, you should stop using a
battery as soon as you feel a substantial decrease in power from the tool.
Completely running down a battery may damage the battery.
Do not tape trigger to run down the battery.
2. How is the Voltage of a Battery Pack Determined?
A battery pack is made up of a series of individual battery cells
connected together. Each cell has 1.2 volts. With the addition of each
cell the battery pack voltage increases by 1.2 volts. For example, a 12
volt battery has 10 cells X 1.2 volts.

3. What is Memory, and do DEWALT batteries have
Memory is one of many conditions which causes a loss of runtime. Memory is
created from repetitive light use in the exact same application (i.e.
Cordless Phones, Video Cameras, Electric Shavers, etc.) Our products
rarely see light use or the exact same loads, due to variability from the
user, the bit size, as well as the material. The same variability which
causes different runtimes, prevents our cells from developing memory.
Power tools are considered high-drain applications. Memory typically
develops in lower-drain rate applications, such as cordless phones,
laptops, etc…, because the rate in which the battery is draining is
continuously the same. Power tools draw higher currents and have sporadic
drain rates minimizing the opportunity for the battery to develop a

Definition of Runtime - the number of holes drilled, screws run,
or cuts which can be made on a charged battery.

4. Does it hurt DEWALT
batteries to leave them in the charger?
chargers have a maintenance mode which allows batteries to remain in the
charger, maintaining a fully charged pack until the user is ready to work.
If the batteries are stored outside of the charger, they will discharge
naturally, 15-20% the first 24 hours, 7-10% the next day, and about 1%
every day there after. NiCd batteries lose the bulk of the capacity when
outside of the charger in the first 3 days. In fact, it is better for the
battery to leave it in the charger to be sure it goes through Equalization
and Maintenance Modes.

5. My battery does not hold a charge anymore, Why?
The potential reasons for this condition are as follows:
1. A connection between the individual cells has broken.
2. A single cell or multiple cells have been overheated and have
3. The battery has reached the limit of its useable life.
4. Poor charging practices

If the battery still runs, but with limited runtime, the cells may be
unbalanced, requiring charging through equalization mode to bring each
cell back to its maximum charge.

6. What can I do to improve the runtime of my battery?
If no permanent damage has been done to your battery, you may be
able to improve its runtime. The correct procedure for charging your
batteries is as follows:
1. Discharge the battery under
normal use. Remove the battery, once you feel a lose of power from the
tool. Do not tape trigger on, this will make it worse.
2. Let the battery sit out of the charger for a least 2 hours until the
battery is at room temperature.
3. Place battery in the charger overnight to allow for a full charge on
each individual cell. (A minimum of 8 hours at room temperature.)

If there is no difference in runtime, there is either permanent damage
or the battery has reached the end of its usable life. In either case, the
battery should be replaced.
7. Does the outside temperature affect batteries? How?
Yes. If the batteries are too hot (1050F or higher) or
too cold (below 400F), the batteries will not take a full
charge. Attempting to charge batteries outside the 400F-1050F
range can result in a permanent loss of runtime. When batteries are being
charged and discharged a chemical reaction is taking place, and if it is
too hot or cold the chemical reaction is disturbed causing a loss of

8. Can an Automotive Charger charge batteries over 12V?
Yes. The new Automotive Charger, DW9109, will
charge all Battery Packs, 7.2V to 18V, in about one hour.

9. Does a DEWALT 15 Minute Charger give as much
charge as a 1 Hour Charger?
Yes. The 15 Minute Charger has the same 3 stage charging process
as the 1 Hour charger, which balances and fills each cell to its fullest
capacity. The fast charge mode takes only 15 minutes versus the 50 minutes
required by the one hour charger.

10. Does our 15 Minute Charger reduce battery life?
No. Our 15 Minute Charger does not hurt the battery due to the
Patented Charge Termination System. Many of our competitors’ 15 Minute
Chargers overcharge their batteries, reducing battery life.

11. Can the DEWALT charger be used with a
Yes. All of DEWALT chargers, excluding the
DW9106, have been designed to handle the variations in voltage and current
delivered by generators.

12. Why can’t I use a 9.6V battery in a 12V Drill?
The tools are designed to run at the specific voltage provided by the
battery pack. Too much voltage, as well as too little voltage, can cause
poor performance and life from the tool. The tool may run for short
periods of time with the wrong battery pack, but it shortens the overall
life of the product. This is the same reason corded products designed for
220V cannot be used in the U.S. where we have 120V outlets.

13. Why is the battery warm when you take it out of the charger?
As a battery approaches a full charge, some of the energy being loaded
into the battery generates heat. It is OK for the battery to get warm, but
it should not get so hot that it is difficult to hold in your hand.

14. Can the XR pack be used in a product which comes with Compact
Batteries, or vice versa? (i.e. XR Pack in a DW952)
Yes. XR, XR2, XR+, and compact Batteries can all be used
interchangeably. The only difference is the Extended Runtime Batteries
will allow the tool to run longer on a charge. The only rule to
interchanging batteries is to match the battery voltage with the voltage
of the product.

15. What should be done with batteries once they have gone bad?
RECYCLE. The material in these batteries (nickel-cadmium)
is toxic, and must be disposed of properly. A Federal Law was
approved in May of 1996, under the Mercury-Containing and Rechargeable
Battery Management Act, mandating the proper disposal of these batteries.
If continued efforts to recycle nickel-cadmium batteries fail, the states
will outlaw their use. Without these batteries, cordless power tools will
not be available as they are today. DEWALT
is an active participant with RBRC (Rechargeable Battery Recycling
Corporation), the organization which is the international leader in the
collection, transportation, and recycling the NiCd cells so they can
remain a viable battery option in the U.S. and the rest of the world. Old
batteries should be disposed of at Black & Decker Service Centers. For
more information call 1-(800) 8-BATTERY or 1-(800) 8-228-8379.

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