Riden RD6018 let out the magic smoke! Why? - Page 1
Forum section: electronics / beginners

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 25, 2023, 04:55:35 am
content: Maybe i did something stupid. I really do not know, so i need some help to understand why this happend.I turned on my Riden RD6018 for boost charging an dead 18V/12Ah Milwakuee drill battery that did nok take any charge from the original charger.I sat my RD6018 to 21V (it,s 5x lithium in series in the battery. So 4.2x5 is 21V. I limited the current to 2Ah on the Riden.I used the black and red terminals on the Riden. (not the green one)I used the two terminals on the battery marked "+" and "-". It is tree more terminals in the middle i did not use.But after around 30 seconds i heard an sound from my riden and i could see the smoke getting out. I turned it off.When i open the Riden up i can se a big hole in the component marked at the image below:Do i did something wrong, or is it just a bad component? I think it is an diode? I cant read the number on the component.PS! I did NOT connected it backwards. The polarity was right.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 25, 2023, 01:05:29 pm
content: Someone that have a clue here?

author: BILLPOD
author_rank: Frequent Contributor
timestamp: January 25, 2023, 02:25:57 pm
content: Good Morning ElectricPower, I once smoked my Mastech 30/5 linear PSUwhile attempting to charge a Porter Cable 19.2 drill battery. What blew were the 3 2N3055 xistors on the back heatsink, along with a large diode on the output jacks. What I think happened is I set the voltage at the fully charged voltage, (19.2 VDC), but the battery was at around 14 VDC,so, so when I connected it the current went to the max. immediately, (no, I didn't set CC). I have used the charger to charge that battery many times since, but always set the voltage to 'JUST ABOVE' what the voltage of the battery is and adjust it according to the current draw.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 25, 2023, 04:39:30 pm
content: The battery measured around 17.8V. I (5x 18650 in series). 4.2 x 5 is 21V. I just can't understand why Riden 6018 let the magic smoke out. I'm absolutelig sure that the cables was connected the right way.But i registered that the riden did not put out 21V but around 18V. The current was sat to max 2Ah on the riden and it gave 2Ah and 18 volt when the magic smoke lets out.I't should have give 21V....?I have two riden power supplies that works, but i do not want to try with these if i did something wrong. I just don't understand why this happend...

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 25, 2023, 11:13:13 pm
content: I have now thinked long and hard on this and i still a little confused why the component marked on the image in my first post lets the smoke out.I'm tempted to believe that it was something wrong with my RD6018 power supply. I have jump charged several single 18650 cells with RD6018 with no problem. But this Milwakuee 18V 18Ah drill battery killed my RD6018 in a way i dont understand.I'm tempted to try with my other RD6018, but i'm not sure....

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 26, 2023, 01:00:20 pm
content: I found out that that component marked on the image in my first post is an XL7015 buck Converter. Why did that let out the magic smoke?

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 28, 2023, 08:17:50 pm
content: It was bad component. I tried the same with an another RD6018 i had, and that worked fine.Case closed.