---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/15/23: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:30 PM - New kid on the block in automatic chargers (Robert L. Nuckolls, III) 2. 07:08 PM - Re: New kid on the block in automatic chargers (Jeff Luckey) ________________________________ Message 1 _____________________________________ Time: 05:30:26 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: New kid on the block in automatic chargers At 10:10 PM 9/13/2023, you wrote: > >Thanks for the link. Yes, I have the exact same charger but with >different results from others. > >I tried charging a motorcycle battery (with the "motorcycle" >setting) and it attempted to boil away the electrolyte. If you can see bubbling, are we talking about a flooded lead-acid battery? >I tried charging a 12V deep cycle battery that still had enough >power to get the solenoids for a pump to click. I was watching the >display and it jumped to 28V. Over the course of a minute or two >the voltage didn't come down and I started to smell battery acid. ANY TIME YOU GET SMELLS/BUBBLES/VISIBLE LIQUID during a charge operation, something is seriously wrong. Unplug charger first, disconnect later, measure open circuit voltage after things settle down. >I ended up charging the deep cycle battery with a regular >charger. After the regular charger had dropped to a low charge rate, Do you know what the battery voltage was at 'end of charge'? What brand and model of the 'regular' charger? > I disconnected it and connected the Yonhan charger and put it into > pulse repair mode. A couple of previous > lister's comments mentioned the short cables and the spark when > the charger was connected. I had the > battery on the floor and the charger on top of it due to cable > length issues. I disconnected one of the > leads from the charger to the battery to check the battery > voltage. When I reconnected the lead to > the battery, the battery exploded and blew out one side and part > of the top. My ears were ringing > for the next 20 minutes from the blast. I'm so glad you were not seriously injured! I've had occasion to use and gather data on three of those chargers two of which are now in the hands of clients. One is on my bench. We don't have enough data to offer a reasonable analysis of what you experienced. I've plotted the behavior of the yonhan charger in the 'pulse mode' and I'm preparing a report along with voltage plots which will come in a day or so. I was off line in Oregon for a couple of weeks and then it took a week to get back in gear when I got home! In the mean time, can you give us a history of the two batteries you cited and a description of the 'standard' charger? Bob . . . //// (o o) ===========o00o=(_)=o00o======== < Go ahead, make my day . . . > < show me where I'm wrong. > ================================ In the interest of creative evolution of the-best-we-know-how-to-do based on physics and good practice. ________________________________ Message 2 _____________________________________ Time: 07:08:27 PM PST US From: Jeff Luckey Subject: Re: AeroElectric-List: New kid on the block in automatic chargers westmeath, Can you give us a timeline of the events described above? How much time had passed since the battery was bubbling and the spark that caused the explosion? This is scary stuff.=C2- The same thing happened to my dad some 50 years ago with some truck batteries that were part of a test bench.=C2- These w ere big flooded-cell batteries and electrolyte spilled out all over the sho p floor.=C2- Yet another good reason to wear eye protection when working with batteries. -Jeff On Friday, September 15, 2023 at 05:40:55 PM PDT, Robert L. Nuckolls, I II wrote: At 10:10 PM 9/13/2023, you wrote: --> AeroElectric-List messageposted by: westmeath@rcn.com Thanks for the link.=C2- Yes, I have the=C2- exact same charger butwith different results from others. I tried charging a motorcycle battery (with the "motorcycle"setting) and it attempted to boil away the electrolyte. =C2- If you can see bubbling, are we talking about a flooded =C2- lead-acid battery? I tried charging a 12V deepcycle battery that still had enough power to get the solenoids for a pumpto click.=C2- I was watching the display and it jumped to 28V.=C2-Over the course of a minute or two the voltage didn't c ome down and Istarted to smell battery acid. =C2- ANY TIME YOU GET SMELLS/BUBBLES/VISIBLE LIQUID during =C2- a charge operation, something is seriously wrong. Unplug =C2- charger first, disconnect later, measure open circuit =C2- voltage after things settle down. I ended up charging the deepcycle battery with a regular charger.=C2- Aft er the regular charger haddropped to a low charge rate, =C2- Do you know what the battery voltage was at 'end of charge'? =C2- What brand and model of the 'regular' charger? =C2-I disconnected it andconnected the Yonhan charger and put it into pul se repair mode.=C2- Acouple of previous =C2-lister's comments mentioned the=C2- short cables and the sparkwhen the charger was connected.=C2- I had the =C2-battery on the floor and the charger on top of=C2- it due tocable l ength issues.=C2- I disconnected one of the =C2-leads from the charger to the battery to check=C2- the batteryvolta ge.=C2- When I reconnected the lead to =C2-the battery, the battery exploded and blew out one side and part ofth e top.=C2- My ears were ringing =C2-for the next 20 minutes from the blast. =C2- I'm so glad you were not seriously injured! =C2- I've had occasion to use and gather data on three of those =C2- chargers two of which are now in the hands of clients. =C2- One is on my bench. =C2- We don't have enough data to offer a reasonable analysis =C2- of what you experienced. I've plotted the behavior =C2- of the yonhan charger in the 'pulse mode' and I'm =C2- preparing a report along with voltage plots which =C2- will come in a day or so. =C2- I was off line in Oregon for a couple of weeks and =C2- then it took a week to get back in gear when I got =C2- home! =C2- In the mean time, can you give us a history of the =C2- two batteries you cited and a description of the =C2- 'standard' charger? =C2- Bob . . . =C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2 -=C2-=C2-=C2-=C2-=C2-//// =C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2-=C2 -=C2-=C2-=C2-=C2-(o o) =C2-=C2- ===========o00o=(_)=o00o==== ===== =C2-=C2- < Go ahead, make my day . . .=C2-=C2- > =C2-=C2- < show me where I'm wrong.=C2-=C2-=C2-=C2-=C2-> =C2-=C2- ==================== ============ =C2- =C2-=C2- In the interest of creative evolution =C2-=C2- of the-best-we-know-how-to-do based =C2-=C2- on physics and good practice. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.