Flashes one red light when I plug it in, and then when I put a battery on it does nothing
May be It can mean your LI ION battery is out of range by the deep discharged protection. !!! your charger is not defect and your battery also not in 80% of this cases you are certainly not the only one with this problem . i think your battery was or is new or for a long time not used have i right ? or it was long lay down in the stockroom by the store before it was selling as i know from experience it by the brand Hitachi its fast much allways going that way. in priority the little 10 volt batteries made of li-ion can have on stock for 5 years its out of range , but i send it back and for service they come back full loaded again and full of capacity. its fully under service and they know that problem, there are no costs as all people with Li Ion tools to sell should know this or asked by purchase by some companies to load it full before buying a new tool with li-ion batteries because it prevents a disappointment and a drive to the shop again.
Note to control it that way 80 % in case of this the charger is not defect ask someone or your dealer or friends to test that charger with a new or other functional or regular used Dewalt fitting li ion battery , then you know for shure that its realy not defect, but your battery can be boosted with a special cadex charger if its was little used but i have made in experienced an discovery (but only on Dewalt li ion batteries..because there are only 3 poles on Dewalt accu s to find its missing that special grooved protection circuits with multiple contacts inside on the li ion batteries as to find by all other regulary brands too find) used a simply auto charger 12 volts 4 amp placed + and - corresponding the pins + and - and for 20 seconds because its li-ion (always by unknown experiments wear safety glasses) under the load and repeat that 3 times on a 14,4 volt li ion battery and after i switched that battery fast after that short boost again in the original loader and if the lamp on the charger was again been continues red thats mean it was reborn new and accept its loading again in the official dewalt loader and it was be accepted from that time again without repeating the same problem after fully loading it again. its made me happy but only by Dewalt was this experiment functional simply + on + and - on -
Beware do not this on other brands like Panasonic Makita Hitachi or other Brands milwaukee to do this li ion action because its has no cure wasting not your time and do not experiment full on the separate cells it can made great explosions without electronic technical impossible because of complex protections that are marketing technical made ONLY by special CADEX chargers are used for it to boost it so it will be again fully functional again .
Li ION is not comparable with Nickel Cadmium or nickel metal hydride, the first must be trained for capacity and the second not but do not load nickel metal hydride batteries in the freezing cold most outside or in cellars the lasting life of that batteries is very short after that . the capaciti will loose and is not coming back and is very bad to boost., Nickel Cadmium is heavy and great instead of Nickel MH . and material is expensiver the only good improvement of NI MH is the weight and the building material, and no capacity memory if its used under normal temperatures. above 0 degrees .
Li-ION hold them as much on the charger change both fast after use will long last the life of the battery.
SOURCE: makita dc1804f charger will not charge new i-mh 1834 18v battery
I think your tryiong to charge NIMH batteries oon a charger designed for Lithium Ion batteries. With all the new style batteries such as NICAD, NIMH and LI-ION, charging becomes difficult. Most chargers pre NIMH and LI-ion, were designed for NICAD's. The best advise, match your batteries with the correct charger
SOURCE: de walt de9118 charger
when charger is plug in to ac it will blink once.normal voltage out for the unit in between 36v to 55 volt. the reading u have is normal.
SOURCE: batteries don't charge
Dust getting in the charger is a problem, Try blowing it out with a moisture-free dust remover, found at most any store. Green flashing means improper power, due to dust or power from the outlet, try a differant wall outlet. Red flashing means the charger or battery is to hot and must cool down before it will charge. The charger will not charge a battery if the lights are flashing. Solid Red light means it is charging and solid green light means it is charged. Plug the charger in first before putting the battery on the charger. If the charger has been droped or hit the floor the coil inside could have broke loose and dammaged the charger requiring it to be replaced.
SOURCE: The red light always flashing when the charger is empty
many chargers do that ,i think it is to let you know thy are on and need to be turned off, when not in use
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