---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 08/17/23: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:12 PM - Re: Next generation Crowbar OVM (Robert L. Nuckolls, III) 2. 12:57 PM - FYI: New kid in battery charger/maintainers (Robert L. Nuckolls, III) 3. 05:27 PM - Re: FYI: New kid in battery charger/maintainers (user9253) 4. 08:35 PM - Re: Re: FYI: New kid in battery charger/maintainers (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 12:12:36 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Next generation Crowbar OVM >>Thanks Bob, that's a handy device if one doesn't happen to have a >>zener on hand with desired voltage, even if it doee require two resistors. best yet, they're really cheap and 0.5% tolerance. Vcc is generally tight enough to serve both as power and reference. 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: 12:57:20 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: FYI: New kid in battery charger/maintainers Over the past few months I've had numerous occasion to do some flat-battery charging as well as verify functionality of a stable of charger/maintainers. For decades I've enjoyed the predictable performance of the Battery Minder and Battery Tender 'wall warts'. Still have 4 or 5 in service. However, the cost of these devices has moved steadily up . . . and up. Some months ago, I picked up a couple of these critters: https://tinyurl.com/3krjhuy8 The price is certainly attractive and less than the 'wall warts'. Further, while the wall wart charge rate was on the order of 0.8 to 1.0 amps, this device claims 10A! Over the past few days I've verified this performance on LA flooded, SVLA and LiFePO4 chemistries. One is justifiably wary of claims for 'repairing' or 'desulfating' a battery. I think I've cited The Battery University several times in the past as a golden source for information on battery technologies, utilization and performance. As a refresher, I'll cite one of many articles on that site; this one specific to sulfation issues: https://tinyurl.com/BatterySulfation So, just ignore those claims for battery resurrection/salvation and know that these are a good value in charger/maintainers. 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 3 _____________________________________ Time: 05:27:26 PM PST US Subject: AeroElectric-List: Re: FYI: New kid in battery charger/maintainers From: "user9253" I purchased a similar one of those chargers. Pros: Charges quickly, up to 8 amps. _ Cons: The wires are too short, only a couple of feet long. The wires are stiff, might be stranded but not very many strands. When clamping onto a battery, a spark jumps. That tells me that the charger is drawing power from the battery before the AC cord is plugged in. An internal fan runs while charging. I would not trust leaving the charger connected overnight. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=511294#511294 ________________________________ Message 4 _____________________________________ Time: 08:35:17 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: FYI: New kid in battery charger/maintainers At 07:26 PM 8/17/2023, you wrote: > >I purchased a similar one of those chargers. >Pros: >Charges quickly, up to 8 amps. >_ >Cons: >The wires are too short, only a couple of feet long. >The wires are stiff, might be stranded but not very many strands. >When clamping onto a battery, a spark jumps. That tells me that the charger >is drawing power from the battery before the AC cord is plugged in. Did you measure-to-confirm? Might just be a capacitor across the output of what must be a switch-mode power supply. I'll check the one that's still here in the morning. >An internal fan runs while charging. Yeah, that's a 100+ watt power supply in that little package. Simple convection venting would be inadequate. Adding a thermostat to shut it off except when needed would add to complexity. >I would not trust leaving the charger connected overnight. I've conducted numerous charge cycles with these on a constellation of batteries. They have behaved as expected. They are advertised as 'maintainers' which tells us they're intended for long term service powered up. 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. ------------------------------------------------------------------------------------- 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.