battery charger circuit overload

Started by lerameur in sci.electronics.basics9 years ago 10 replies

Hello, I have a battery charger here http://www3.sympatico.ca/captoro/motor/fullCircuit.gif the circuit is in two phase: - BAttery A and B ...

Hello, I have a battery charger here http://www3.sympatico.ca/captoro/motor/fullCircuit.gif the circuit is in two phase: - BAttery A and B charging BAttery C and D - BAttery C and D charging BAttery A and B 1) once the opto couplers are on, the 5amp fuse on battery A and B just blows up. (it should be about 1.5amp) short circuit somewhere... 2) The 100 ohm resistors in the optocoup...


Battery for Winbook XLI Laptop

Started by W. Watson in sci.electronics.basics11 years ago 1 reply

I contacted a battery store in Palo Alto, CA about the battery for a Winbook Xli, and they said they no longer carry them, since they have...

I contacted a battery store in Palo Alto, CA about the battery for a Winbook Xli, and they said they no longer carry them, since they have proven unreliable. This might be the case. Certainly within three years of having this laptop, the battery faltered. Any comments on the wisdom of buying a battery for this laptop? Winbook no longer sells the battery. Any idea how long a laptop battery...


12v 4amp rechargable battery

Started by Paul Stewart in sci.electronics.basics9 years ago 3 replies

I have been googling on an off but not managed to find anything suitable. I wonder if anyone on here is able to help. I have a home made...

I have been googling on an off but not managed to find anything suitable. I wonder if anyone on here is able to help. I have a home made laptop. My problem is powering it from battery. I am looking for a battery pack that outputs 12 and 4/5 amps. However I also want something that comes with a charger and that will provide enough current to both keep the battery charged and power the un...


IBM's Super Battery

Started by Bret Cahill in sci.electronics.basics8 years ago 79 replies

IBM and MIT announced a battery with a 40% more mechanical energy than liquid fuel: 5 kW-hr/kg. Is the spent battery material reprocessed or...

IBM and MIT announced a battery with a 40% more mechanical energy than liquid fuel: 5 kW-hr/kg. Is the spent battery material reprocessed or is the battery simply recharged? What is the projected price? Bret Cahill


Battery switch

Started by W. eWatson in sci.electronics.basics5 years ago 8 replies

I bought a device that will allow me to undo a plastic knob and disconnect my battery. Should I put it on the ground or hot cable? The only...

I bought a device that will allow me to undo a plastic knob and disconnect my battery. Should I put it on the ground or hot cable? The only negative affect seems to be that I would need to reset the clock each time I reconnected the battery; otherwise, I would think that no harm would come to the electronics. Recently, it's gotten bad enough that it drained my battery. I'm doing thi...


Dry dead battery

Started by rabiticide in sci.electronics.basics9 years ago 22 replies

I was charging my battery over the weekend and checked it last night to find the battery dead as a doornail. Upon examination, the battery is...

I was charging my battery over the weekend and checked it last night to find the battery dead as a doornail. Upon examination, the battery is completely dry. I'm guessing it was overcharged and the water boiled away but it shouldn't've 'cause it's an "automatic battery charger" that's designed to stop charging when it's done... So, do I just add distilled H2O? Will that work? I have to walk...


Testing Battery Backup

Started by gkam...@hotmail.com in sci.electronics.basics10 years ago 8 replies

Ice storm today with many outages and resultant surges. My security system console is showing a low battery indicator. There is a...

Ice storm today with many outages and resultant surges. My security system console is showing a low battery indicator. There is a 9v transistor battery in there to hold the zones and detector info. When I replaced the battery the low battery status light does not go out, so I am beginning to wonder whether the leads have detached inside the console or worse, that part of the electronics g...


synchronous rectification/current limiting

Started by kell in sci.electronics.basics10 years ago 3 replies

I wanted a synchronous recitifier for a voltage regulator in an old- style dc generator on an antique truck (to block the battery...

I wanted a synchronous recitifier for a voltage regulator in an old- style dc generator on an antique truck (to block the battery from discharging into the generator). This is what I came up with. I built it on a breadboard with junkbox parts: For the battery under charge used a junk motorcycle battery, and I used a 12 volt battery in series with a 6 volt battery to serve as a simulated ge...


PDA Battery

Started by Michael in sci.electronics.basics11 years ago 2 replies

Hi, I have a PalmOne Tungsten T3 and the battery is starting to go down hill. I've looked at getting other batteries as a replacement which...

Hi, I have a PalmOne Tungsten T3 and the battery is starting to go down hill. I've looked at getting other batteries as a replacement which raised a question..... Can I replace the original 3.7V 900mAh battery with two 3.7V 1100mAh ones providing they're wired in parallel? Would the pda 'see' any difference between them (them being the older battery and the newer 'one')...Especially ...


Battery for Winbook XLI Laptop

Started by W. Watson in sci.electronics.basics11 years ago 8 replies

I contacted a battery store in Palo Alto about the battery for an Xli, and they said they no longer carry them, since they have proven...

I contacted a battery store in Palo Alto about the battery for an Xli, and they said they no longer carry them, since they have proven unreliable. This might be the case. Certainly within three years of having this laptop, the battery faltered. Any comments on the wisdom of buying a battery for this laptop? Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA) ...


Reviving dead car battery. How?

Started by harore in sci.electronics.basics10 years ago 6 replies

Helloo.. By theory, the car battery can be assumed dead when it can hold anymore charge right? But my car battery happens to have the...

Helloo.. By theory, the car battery can be assumed dead when it can hold anymore charge right? But my car battery happens to have the charge below than 12 hours meaning that I need to jumpstart it every morning. Then, the battery runs fine all day long. I need your guys(gals) advice on this. I can buy a new one but if I can still use it, why not? Also, I don't want to throw the battery as ...


Seeking Dual Car Battery Installation Advice

Started by W. Watson in sci.electronics.basics10 years ago 7 replies

I'm about to configure my 97 Plymouth van so that it has two batteries. The second battery will be kept in the rear of the van in a battery box...

I'm about to configure my 97 Plymouth van so that it has two batteries. The second battery will be kept in the rear of the van in a battery box with a vent through the floor. I'm using a Mega-Tron RV-Marine Deep Cycle 12v battery, which will provide power to a medical device at night. I bought a Valmar (Model 31122) battery selector switch. The switch has four settings: Off, 1, All and 2...


9v battery min voltage

Started by lerameur in sci.electronics.basics11 years ago 10 replies

HI I am building a unit that will have a small 9v battery for power. I will put a voltage comparator and it will activate a led to warn for...

HI I am building a unit that will have a small 9v battery for power. I will put a voltage comparator and it will activate a led to warn for a low voltage battery. Iwould like to know at what voltage dos the battery need to be change, when is it dead ? is it 7.5 v ? or 8?.... thanks ken


Can a car battery be kept charged with another car battery?

Started by billcalley in sci.electronics.basics10 years ago 12 replies

Hi All, I have a car that is not located near any 120VAC power, so I cannot use a normal trickle charger to maintain my car's battery...

Hi All, I have a car that is not located near any 120VAC power, so I cannot use a normal trickle charger to maintain my car's battery at full charge (the car sits for long periods). But can I use another (fully charged) lead acid car battery, or perhaps even one of those portable car jump starter units (like the Black and Decker VEC010BD 300 AMP JumpStarter), to keep my car's battery ...


How to lit led using 1.2 volt small battery.....

Started by Arafat Safdar in sci.electronics.basics9 years ago 7 replies

Hey can some1 tell me how can I lit LED through 1.2 volts battery.I Connected 330 ohms resistor in series it works on 5v battery but it doesnt...

Hey can some1 tell me how can I lit LED through 1.2 volts battery.I Connected 330 ohms resistor in series it works on 5v battery but it doesnt work on 1.2 v battery Regards, ARAFAT SAFDAR WWW.ALAGRAS.TK trading and contracting


Battery question

Started by loui...@gvltec.edu in sci.electronics.basics10 years ago 37 replies

> Hi I have a battery that is 11.1 volt and the device I'm powering will > require 5v 2 amps. I'm going to use a regulator to step the...

> Hi I have a battery that is 11.1 volt and the device I'm powering will > require 5v 2 amps. I'm going to use a regulator to step the battery > down. How long of a runtime do you think I can get out of this setup? I > appreciate any input.


Replacing external power supply with battery

Started by Mike in sci.electronics.basics11 years ago 9 replies

I am looking to battery power one of the Atari Flashback II consoles that were on sale the past couple of weeks. The FB2 is powered by a 9v...

I am looking to battery power one of the Atari Flashback II consoles that were on sale the past couple of weeks. The FB2 is powered by a 9v external power supply. I remember reading somewhere's that the FB2 takes up very, very little juice and could be easily run on a 9 volt battery. Would it be as simple as... 9v battery --> battery connector --> 2 wires --> female power jack that


3.3 v Camera On Old Li-Ion Cell Ph. Battery

Started by Bret Cahill in sci.electronics.basics5 years ago

This is an old battery that won't charge up more than 3.9 v so DO NOT try this with a good battery without something to reduce the...

This is an old battery that won't charge up more than 3.9 v so DO NOT try this with a good battery without something to reduce the voltage, maybe a 1 ohm resister. The Samsung 530 camera draws 1 amp when on which is too much for common heavy duty D cells. Even off it seems to draw 5 milliamp. Before the cheapest power in # of photos/battery was the Eveready Ultimate Lithium, $5/pair, ...


Keeping a 12v battery charged above 80%

Started by W. eWatson in sci.electronics.basics5 years ago 22 replies

I had a fellow out to do some electrical work that involves one 12v marine battery. The battery will be used about 4-6 hours a night...

I had a fellow out to do some electrical work that involves one 12v marine battery. The battery will be used about 4-6 hours a night sporadically. Maybe 15-20% of the time. He offered that it should be recharged every day, and keeping it above 80% was important for the life of the battery. Somehow that seems a bit high. Apparently, there's a charger of some sort that costs about $150 th...


Formula for charging time of 12v battery

Started by Northern Night Sky in sci.electronics.basics6 years ago 23 replies

I have a Powerpack 300, which is a 12v battery at 12Ah. Using the AC adapter with the house outlet (20amp at 120v) it takes 17 hours to fully...

I have a Powerpack 300, which is a 12v battery at 12Ah. Using the AC adapter with the house outlet (20amp at 120v) it takes 17 hours to fully charge the battery. How would I calculate the (approximate) time it would take to charge the battery, using a solar panel that draws 1amp at 15v?