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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.
Yes you can. On tools, 18 volts is 18 volts. Tools don't 'know' how the power is being created, either by Ni-Cad or Li-Ion means. Chargers are totally different. Most Li-Ion chargers can charge older Ni-Cad and some Ni-MH batteries but older Ni-Cad chargers will charge Li-Ion battery untill they overheat and sometimes start on fire because older chargers can't detect when the Li-Ion batteries are full.
Before you do any thing, take the battery out and try to boot the machine on just AC power alone. If your laptop is a recent machine, it more than likely has a Li-ion battery in it. Many machines have a safety feature built into the Li-ion battery that shuts the machine down in order not to overcharge a depleted battery and cause a fire.
More than likely you have a Li-ion battery in the machine. If the voltage level of a Li-ion battery falls too low, it sends a signal to the charger not to charge. This is a safety measure built into Li-ion batteries to prevent rapid charging that would possibly cause a fire. I am afraid that you are going to have to replace the battery. If you take the battery out, then you should be able to boot the machine just on AC power.
Take the battery out of the machine. Leave it connected to the AC power and try again to start it. If it happens your battery is a Li-ion and a safety feature is built into the battery pack to prevent your charger from over charging a depleted battery and causing a fire.
Li-Ion battery and NiMh battery have completely different charging requirements! Li-Ion battery has much stricter charging requirement and the regulator is normally design to trickle charge at 0.1 Current rating @ 4.2V and then completely shut down. WARNING: if you use a Ni-Mh charger on a Li-Ion battery, then it will erupt and even explode and catch fire! Bottom line is that the rescued Li-ion regulator is not designed for your Ni-Mh pack and you will never get a full charge with it and you will need a completely different regulator board: you are better off putting in a suitably sized Li-Ion battery with inbuilt regulator but with higher current rating if possible. Hope it helps! Let me know how you go.