I have a Lincoln 14.4-18v charger that showing a hot-cold pack delay. I have two batteries that haven't been used in a few days and the code comes up on both.

On the Makita 18-V DC18RA charger, the flashing red light means that the battery is not at the correct temperature for safe charging. If the battery is hot (from use or being in direct sunlight), charging will begin when the battery cools down. If the battery is cold, then charging will start when the battery warms up. (Note: the cold battery could have moisture condensation issues. This could delay the start of the charging cycle.) Home Depot has the manual for this charger here: https://images.homedepot-static.com/catalog/pdfimages/35/35393127-7c0b-4668-8609-9104ae7cc187.pdf . I suspect that Makita uses the same "code" on all of their chargers.

I hope this helps.

Cindy Wells

the trimmers switch may be faulty.

CHARGING THE BATTERY PACK
Battery packs for this tool are shipped in a low charge condition
to prevent possible problems. Therefore, you should
charge them until the green LED on the front of the charger
comes on.
NOTE: Batteries will not reach full charge the first time they
are charged. Allow several cycles (operation followed by
recharging) for them to become fully charged.
CHARGING A COOL BATTERY PACK
See Figure 3.
If battery pack is within normal temperature range, the red
LED on charger will come on.
NOTE: If the charger does not charge the battery pack
under normal circumstances, return both the battery pack and
charger to your nearest Ryobi Authorized Service Center for
electrical check.
n Charge the battery pack only with the charger provided.
n Make sure the power supply is normal household
voltage, 120 volts, 60 Hz, AC only.
n Connect the charger to the power supply.
n Place the battery pack in the charger aligning raised rib
on the battery pack with the groove in the charger.
n Press down on the battery pack to be sure contacts on
the battery pack engage properly with contacts in the
charger.
n Normally the red LED on charger will come on. This
indicates the charger is in fast charging mode.
n Red LED should remain on for approximately 1 hour
then the green LED will come on. Green LED on
indicates battery pack is fully charged and charger is
in maintenance charge mode.
NOTE: The green LED will remain on until the
battery pack is removed from the charger or charger is
disconnected from the power supply.
n If both yellow and green LEDs come on, this indicates
a deeply discharged or defective battery pack.
Allow the battery pack to remain in the charger for 15
to 30 minutes. When the battery pack reaches normal
voltage range, the red LED should come on. If the
red LED does not come on after 30 minutes, this may
indicate a defective battery pack and should be
replaced.
n After normal usage, a minimum of 1 hour of charging time
is required to fully recharge battery pack.
n The battery pack will become slightly warm to the
touch while charging. This is normal and does not
indicate a problem.
n Do not place the charger and battery pack in an area of
extreme heat or cold. They will work best at normal room
temperature.
NOTE: The charger and battery pack should be placed
in a location where the temperature is more than 50°F
but less than 100°F.
n When batteries become fully charged, unplug the
charger from power supply and remove the battery
pack.
Source(s):http://toolboyworld.com/eBay/Ryobi_P110/...

What is the residual voltage on your battery, if it is too low, charger will not engage. If the voltage is below the threshold allowed, simply jolt the Nickel Cadmium battery with a car charger to bring it up, then install on charger.

Have you try another battery?

If you haven't use your Nikon Coolpix camera battery for a long time and now there is no power, when you first plug it to charger it maybe show none action. And charger longer it will be well. But if your battery Nikon camera battery are used well these days, and it won't be charge. It means you need a new Nikon battery charger

This is indicating the battery is too hot to charge, usually after coming off the tool right after some hard work. During the charging process the battey heats up so if you charge a hot battery, thereby making it hotter, you shorten the lifespan of the battery considerably. If you are getting a hot/cold pack delay indication on the charger, it should automatically start charging once the battery has cooled down sufficently.

Here are the codes for Dewalt Charger Flash indications:
---- ---- ---- ---- ---- ---- ---- Charging
------------------------------------ Charged
----- - ----- - ----- - ----- - ----- Hot/Cold Pack delay
- - - - - - - - - - - - - - - - - - - Replace pack

If both lights are flashing after you put a cool battery on the charger, the battery is bad. It could have a bad, worn or shorted cell or other problems inside and the charge will not charge it as long as it reads it as a bad battery. Rechargable batteries do have a finite life determined mainly by how many times you recharge them.

same prob here, except its just one pack. mine is a 14.4 impact driver

This could happen if the batteries have been recently used, and are "hot". Chargers use one, or a combination of, "end of charge" detectors. Either it's timed, detects a slight drop in voltage, or senses temperature. Try waiting 30 minutes to an hour after use before charging. Also, be sure the ambient temperature is within parameters. Too hot or cold (we live up north...gets cold in the garage) will affect the charger.