Wireless battery add-on

Started by Tim Wescott in sci.electronics.design5 years ago 9 replies

This is a reach, but I could see this as being something that would have a wider market than just my customer. My customer is hot on the idea...

This is a reach, but I could see this as being something that would have a wider market than just my customer. My customer is hot on the idea of wirelessly charging a battery. I'm thinking that, at their production levels, if someone Out There makes a module that'll handle the wireless battery charging part (i.e., the wireless power transfer, the battery charging, management, etc.), th...


Battery Symbol

Started by Tim Wescott in sci.electronics.design6 years ago 18 replies

I'm hot on the trail of a completed PCB design, which is why I'm flooding the group with questions. I know that the battery symbol with one...

I'm hot on the trail of a completed PCB design, which is why I'm flooding the group with questions. I know that the battery symbol with one long side and one short comes from some long-ago battery construction that looked more or less like that. Does anyone know what the battery type was? It certainly wasn't a Leclanché cell. -- Tim Wescott Wescott Design Services http://www...


OT: Unexpected, but maybe should have expected

Started by Jim Thompson in sci.electronics.design4 years ago 11 replies

Unexpected, but maybe should have expected... Wife brings a digital kitchen timer into my office... "it stopped working". Changed...

Unexpected, but maybe should have expected... Wife brings a digital kitchen timer into my office... "it stopped working". Changed battery... nada. On a lark, don't know why I thought of it, removed battery from holder, took a clip-lead and shorted battery holder. Re-inserted battery... voila, it's back working. ...Jim Thompson -- | Jame...


Battery Current Loss with Temperature

Started by Anonymous in sci.electronics.design1 year ago 9 replies

When a lithium ion battery is charged, a current is driven into the cell and the state of the battery can be tracked by measuring the integral of...

When a lithium ion battery is charged, a current is driven into the cell and the state of the battery can be tracked by measuring the integral of the current over time. When the battery then is cooled, the terminal voltage is reduced, but also, the available current is reduced over time. This link shows a typical discharge curve for multiple temperatures. https://www.rich


Battery Life

Started by OG in sci.electronics.design4 years ago 18 replies

Any rule of thumb to estimate battery life comparison. Duracell 9V battery vs 9V - Duracell 6 cell AA (in a holder). Application is very...

Any rule of thumb to estimate battery life comparison. Duracell 9V battery vs 9V - Duracell 6 cell AA (in a holder). Application is very low drain, unknown value. With the 9V battery the device runs continuously for 6 months. Just need a guestimate. --- news://freenews.netfront.net/ - complaints: news@netfront.net ---


OT: Laptop battery and BIOS

Started by Wanderer in sci.electronics.design4 years ago 12 replies

I bought an HP ze4300 for $17. The picture on ebay showed a green led indicating a good battery, but when I get it the battery doesn't seem to...

I bought an HP ze4300 for $17. The picture on ebay showed a green led indicating a good battery, but when I get it the battery doesn't seem to work. This site says it might have something to do with the BIOS. http://h20564.www2.hp.com/hpsc/doc/public/display?docId=c00786097 " DESCRIPTION: The battery for your notebook PC will not charge. When this occurs, the notebook charge LED


Test a lead-acid battery "in-the-field"

Started by pozz in sci.electronics.design3 years ago 16 replies

I have to design an electronic circuit that must be supplied from an AC/DC, when the AC is present, and from a 12V lead-acid battery, when the...

I have to design an electronic circuit that must be supplied from an AC/DC, when the AC is present, and from a 12V lead-acid battery, when the AC is absent (blackout). The circuit will need 1-2A maximum. When the AC is present, the battery should be charged. A protection against polarity inversion of the battery should be present, at least with a fuse. I normally use a simple circuit...


Battery or charger

Started by Andy K in sci.electronics.design5 years ago 4 replies

My battery in my Alcatel phone will no longer charge. How can I tell if the charger is bad or the battery ? The charger connector is too...

My battery in my Alcatel phone will no longer charge. How can I tell if the charger is bad or the battery ? The charger connector is too small to test with a voltmeter. Thanks.


Big batteries

Started by bitrex in sci.electronics.design3 years ago 23 replies

http://insideevs.com/wp-content/uploads/2016/12/chevrolet-bolt-powertrain-2_002.jpg The first gen Volt's ~12kWh battery is on the far left,...

http://insideevs.com/wp-content/uploads/2016/12/chevrolet-bolt-powertrain-2_002.jpg The first gen Volt's ~12kWh battery is on the far left, then the second gen's ~14kWh battery next, then the Spark EV's ~20kWh, then the Bolt's ~60kWh battery final. 160kW maximum power output from the Bolt's battery, cool. The Volt doesn't have a fast charging option and the onboard charger is limited ...


OT: Soldering large 18650/20700 lithium-ion batteries?

Started by John Doe in sci.electronics.design7 months ago 23 replies

I am neat, careful, and quick to avoid overheating when soldering. How possible is it to solder a large lithium-ion battery without damaging or...

I am neat, careful, and quick to avoid overheating when soldering. How possible is it to solder a large lithium-ion battery without damaging or degrading the battery? For connecting batteries together. I like doing things right, so I'm willing to buy a $100 Chinese battery connector welding box. But the foreseeable need is only about five two- cell battery packs. You do the math... Th...


LiPo Battery Charging Chips

Started by Tim Wescott in sci.electronics.design5 years ago 12 replies

I know how to charge a LiPo battery if I'm the one designing the whole circuit. Are there any decent multi-cell LiPo battery charging chips? ...

I know how to charge a LiPo battery if I'm the one designing the whole circuit. Are there any decent multi-cell LiPo battery charging chips? By preference I'm looking for something that can charge a three-, four-, or five-cell pack at between 50 and 500mA, that basically is lickum-stickum: I want to supply it with a raw voltage, hook up the battery, and be able to read status from it...


How is battery capacity calculated ?

Started by Anonymous in sci.electronics.design7 years ago 14 replies

To all the electronics gurus on this newsgroup - how is battery capacity decided - for example if I buy a 6 Volt 5AH sealed lead acid...

To all the electronics gurus on this newsgroup - how is battery capacity decided - for example if I buy a 6 Volt 5AH sealed lead acid battery, how did the manufacturer come up with the number 5AH ?


vehicle battery supercapacitor kit ideas

Started by Jamie M in sci.electronics.design6 months ago 15 replies

Hi, I have installed and tested a supercap on a V8 engine as an experiment to avoid buying a new lead acid battery: Here is the supercap I...

Hi, I have installed and tested a supercap on a V8 engine as an experiment to avoid buying a new lead acid battery: Here is the supercap I used: https://www.ebay.com/itm/16V-83F-Farad-Capacitor-Super-Capacitor-2-7V-500F-With-Protection-Board -Module/223685920878 (16V-83F) I soldered ring terminals to it and bolted it directly to the 12V battery (in parallel with the battery). Be


D celll alkaline battery capacity

Started by Anonymous in sci.electronics.design2 years ago 8 replies

I'm trying to determine the lifetime of a alkaline 'D' battery with a very low discharge rate of 3.5 milliamps. I see a lot of data that...

I'm trying to determine the lifetime of a alkaline 'D' battery with a very low discharge rate of 3.5 milliamps. I see a lot of data that suggests the capacity ranges from 12,000 to 18,000 maH or about 200 days. But I suspect the battery will last 1 or 2 years at 3.5 milliamps. Anybody have a chart showing battery life at very low discharge rates?


How do i choose a IC Battery Charger ?

Started by R. Hernandez in sci.electronics.design6 years ago 9 replies

regards about current set-up current? output current? Battery current? the goal is for a 3v6 1 cell Li-on Battery Tnx!!

regards about current set-up current? output current? Battery current? the goal is for a 3v6 1 cell Li-on Battery Tnx!!


another atomic battery

Started by John Larkin in sci.electronics.design8 years ago 16 replies

http://citylabs.net/ Looks like betas whacking solar cells. Makes no sense to me. A primary lithium battery will deliver power for over...

http://citylabs.net/ Looks like betas whacking solar cells. Makes no sense to me. A primary lithium battery will deliver power for over 20 years at a cost per joule probably a million times better than this. Not to mention getting a more sensible terminal voltage. How do they expect to charge a battery with 0.7 volts? That all goes for most of the "energy harvesting" things you read ...


Battery charging

Started by Anonymous in sci.electronics.design5 years ago 27 replies

Hi, I am looking for Lead Acid battery 24V, 12AH. The problem is that I am unable to find one under 30 bucks. Can anyone give a...

Hi, I am looking for Lead Acid battery 24V, 12AH. The problem is that I am unable to find one under 30 bucks. Can anyone give a suggestion? The alternative is to is to add two 12V batteries in series but I do not have any information about the related complexities of charging them with a 12 V or 24V battery charger. Erica


How do you calculate the REQUIRED voltage from a transformer secondary

Started by Anonymous in sci.electronics.design3 years ago 30 replies

How do you calculate the REQUIRED voltage from a transformer secondary? Ok, here's the plan. A friend of mine installed a bunch of LED...

How do you calculate the REQUIRED voltage from a transformer secondary? Ok, here's the plan. A friend of mine installed a bunch of LED fixtures to run off a solar panel and a 12V marine battery. It's drawing about 15amps at 12VDC. It works fine when the sun is shining, but drains the battery when there is no sun. He said he gets tires of having to hook a battery charger to that battery ...


flow battery with water soluble, non metal reactants

Started by Jamie M in sci.electronics.design6 years ago 4 replies

Hi, Here's a link to a paper on a flow battery with non toxic water soluble reactants, apparently 10 times cheaper to manufacture than...

Hi, Here's a link to a paper on a flow battery with non toxic water soluble reactants, apparently 10 times cheaper to manufacture than lithium batteries. I guess to make it even simpler they could remove the separation membrane as I had read about one laminar flow battery experiment did this. https://pressroom.usc.edu/usc-scientists-create-new-battery-thats-cheap-clean-rechargeable-and-...


Charging deep cycle battery

Started by Anonymous in sci.electronics.design5 years ago 37 replies

When I am on the road, my electronics: voice phone, data phone, tablet, GPS and laptop are killing my car battery. Finally, my "short" cycle...

When I am on the road, my electronics: voice phone, data phone, tablet, GPS and laptop are killing my car battery. Finally, my "short" cycle battery gave up. So, I got a deep cycle battery with 600 CCA and 160 AHr @ 1A. I am thinking about getting a 1000W generator to charge it instead of the car engine. What is the practical fast charging current? Can I dump 100Amp (with a cus