DeWalt 20VMax Battery Hot Cold Charge Delay No Matter What Temperature
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- Опубликовано: 30 мар 2023
- This battery stopped charging with a "Hot/Cold Delay" error no matter what temperature it actually was. I this video I disassemble, diagnose, and fix the bad surface mount resistor in the temperature sensing circuit.
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Very good! Tomorrow i will check another model i have here with this problem.
Nice fix, I would have just put 13 k resistor across the terminals to fool the charger, ignoring any temperature issues.
I considered that, but the cold delay especially is useful sometimes when I've been working outside all day!
Could you explain how to do this please?
100 or 13k?
What kind resistor use for ?
Jake, thanks for sharing the video. Can you tell me exactly how you determined that the thermistor was bad (multimeter setting and where exactly you contacted the red / black multimeter prongs...it was difficult to see in the video) and what is an approx. normal read versus a bad one? I have a fairly new Dewalt 20V 8AH battery that was used lightly approx. 5 times, and I got the flashing yellow light while charging. What was interesting was the yellow light went off when I angled the battery while docked (I kind of pulled the battery away from dock while still inserted if that makes sense...possibly somehow pulled away the TH when charging?) so I maintained that weird angle and the battery went to a full charge without the yellow light. Unfortunately, the battery only works on my flashlight but if I use it on anything requiring more power (router, drills, etc.) it won't work. The battery reads 19.9V when tested. I plan on contacting the church to have an exorcism done on it soon. lol
It’s been some time since I made this video and I don’t remember the answers to your questions. In general the most common thermistors should read about 10K ohms at room temperature, they should not read open or 0 ohms. From your description, I’d look closely at the batteries contacts. My theory is ther is some dirt or corrosion such they can provide enough current for the flashlight but not any more demanding tools. Either that or you just happen to get a battery with a faulty cell.
Can i still.charge my battery to full even if the yellow light is on?
In a working battery the yellow light will eventually go off and the battery will charge, in this case the yellow light never went off.
Hi just Saw this video, I have the same issue with One of my 18v 5ah Battery, you say 100 Ohms resictor and Mathias says 13k ? Which One to use 😀 and do you have to remove the Surface mounted one first?
I think he was talking about replacing the thermistor with a fixed resistor, where, as I was repairing a resistor in the circuit, so that the thermistor would still operate correctly
@@JakevonSlatt ok, I Think the thermistor in my dewalt battery is Broken. No measurement. Can I just replace that without removing the Old One?
@@fmolland theoretically yes, if it’s truly permanently broken. But I think I’d remove it anyways just to be safe.
@@JakevonSlatt thank you, I will order some thermistor for this. I had hoped to not remove (turn over) the pcb but I guess I have to 😀
IF thermistor is defect - Dead, would battery work? My battery Works on one of My Tool, not all
Need more zoom into the board
Jesus man
I’m a fan but not a follower?
Shouldn’t DeWalt just let us return the battery? Because I’m not a electrician.
Well, the battery is a few years old and I flog them hard so I wouldn’t expect Dewalt to have any responsibility here.