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.basics6 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...


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...


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


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

Started by Bret Cahill in sci.electronics.basics6 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.basics7 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?


Battery parallel connection ?

Started by mowhoong in sci.electronics.basics5 years ago 2 replies

Parallel connection on lantern batterys will have higher current, but it wi= ll cause self dicharge to other battery with lower voltage. My...

Parallel connection on lantern batterys will have higher current, but it wi= ll cause self dicharge to other battery with lower voltage. My solution to = solve this problem was to add one diode to each battery, but I do not know = why this method was not used on commerical battery pad ? Can any members of= this group give me me advice. Thank you and happy x'mas to all members. Regards


Battery Selection

Started by OldGuy in sci.electronics.basics3 years ago 5 replies

I need to run my laptop for many hours and in a mobile state; i.e. no AC Power available not car available. I have a Enercel AC/12VDC to...

I need to run my laptop for many hours and in a mobile state; i.e. no AC Power available not car available. I have a Enercel AC/12VDC to laptop power block cord. What is the best battery to use with this other than a full size car battery. I have been looking at closed cell 12v 18AHr batteris as a possible choice. not sure is these are deep discharge. Or maybe a motorcycle battery...


PWM from raspberry pi to control charging of a 12 V Battery, possible?

Started by Anonymous in sci.electronics.basics5 years ago 2 replies

Hi there, I just got a raspberry pi and was wondering if it is possible to use its PWM output to control current flow to a 12 V Battery (with...

Hi there, I just got a raspberry pi and was wondering if it is possible to use its PWM output to control current flow to a 12 V Battery (with an IGBT). My idea is to use a 300 W windmill, a simple AC/DC converter, a IGBT, and the battery at the other side. If voltage is above 13.8V, I reduce the current via PWM to fully charge the battery and disconnect the windmill as soon as the battery ...


Battery choice: 9V vs 6 AAs

Started by Adam Funk in sci.electronics.basics3 years ago 35 replies

I'm fixing a kid's toy that was damaged by corrosion (stored with the batteries). The only damaged part was the battery compartment, so...

I'm fixing a kid's toy that was damaged by corrosion (stored with the batteries). The only damaged part was the battery compartment, so I opened it up, clipped off the internal wires to that bit, soldered extensions on them & ran those through holes in the case, in order to put an external 6 AA holder on. As it turns out, the 6 AA battery holder I bought clips onto a 9 V battery attachment,...


Step down transformer as a battery charger ?

Started by Mint in sci.electronics.basics7 years ago 5 replies

I salvaged a 9.6 V NiCd battery. 800 mAh Could I use a 9.0 volt transformer to charge the battery? I have one that outputs 100 m.a. and...

I salvaged a 9.6 V NiCd battery. 800 mAh Could I use a 9.0 volt transformer to charge the battery? I have one that outputs 100 m.a. and another at 200 m.a. Thanks, Andy


Discharging a lithium-ion battery, what is the third wire for?

Started by John Doe in sci.electronics.basics8 years ago 24 replies

I have some Bosch BAT411 lithium-ion 10.8 V batteries. One of the tools is a flashlight. It includes a small circuit board between the battery...

I have some Bosch BAT411 lithium-ion 10.8 V batteries. One of the tools is a flashlight. It includes a small circuit board between the battery and the light bulb. The battery plug has three wires. I realize that lithium-ion batteries use regulation when charging, but what is the third contact for when the battery is being used? Thanks.


Battery charging question...

Started by Dave in sci.electronics.basics2 years ago 8 replies

Just a quick question, but aren't we supposed to charge a rechargable battery gy sending current through it in reverse to the normal polarity of...

Just a quick question, but aren't we supposed to charge a rechargable battery gy sending current through it in reverse to the normal polarity of the battery? Just wondering why it doesn't seem to be working... Thanks


Charging A Lead Acid Battery

Started by Dave.H in sci.electronics.basics10 years ago 26 replies

How would I go about building a charger for a lead acid battery. Jaycar Electronics sells a 5 amp hour 6 volt SLA battery for use in flashlight...

How would I go about building a charger for a lead acid battery. Jaycar Electronics sells a 5 amp hour 6 volt SLA battery for use in flashlight lanterns, but as far as I can tell they don't sell the charger. Battery http://www.jaycar.com.au/productResults.asp?FORM=KEYWORD (CAT. NO. SB2498) Thanks


AA battery dead with debris

Started by W. eWatson in sci.electronics.basics6 years ago 4 replies

I have a one foot diameter clock with a AA battery. I noticed it had stopped. I looked at the back, and found white power had seeped out of...

I have a one foot diameter clock with a AA battery. I noticed it had stopped. I looked at the back, and found white power had seeped out of battery. I don't think it's acidic, and I know the regular trash pick up will take such batteries. What's the best way to clean up the mess to put in a new AA?


Charging an alarm battery

Started by W. eWatson in sci.electronics.basics5 years ago 4 replies

I have a Xantrex 12v rechargeable 600 Power Pack battery. Yesterday I charged it up and then attached a 12v smaller alarm battery. I forgot...

I have a Xantrex 12v rechargeable 600 Power Pack battery. Yesterday I charged it up and then attached a 12v smaller alarm battery. I forgot to check a few hours later. However, 8 hours later I disconnected the two and found the alarm battery at 11.1 volts, and the Xantrex at 0%. I'm recharging the Xantrex now. Did I somehow harm it?


Diodes for 12v battery charging

Started by Stumpy in sci.electronics.basics8 years ago 22 replies

I put in a 12v solar panel to charge up 2 ATV's and a mini tractor. Ran some speaker wire and battery clips to charge all of them in parallel. ...

I put in a 12v solar panel to charge up 2 ATV's and a mini tractor. Ran some speaker wire and battery clips to charge all of them in parallel. The tractor battery seems to not hold a charge very well. I'd like to add 3 diodes to protect the other 2 batteries in case at night with no input current, the low battery would siphon off power. The setup is in a very remote location with no ...


why does a car battery spark

Started by panfilero in sci.electronics.basics8 years ago 94 replies

I'm trying to figure out what are the paramters that cause a spark.... a visible spark. For example, if I take a 9V battery and connect...

I'm trying to figure out what are the paramters that cause a spark.... a visible spark. For example, if I take a 9V battery and connect the leads together with a small wire, no spark... I imagine if I get a 12V battery and do the same thing, no spark (I'm refering to therelatively small 12V batteries that duracell and energizer make,) now take a car battery and no doubt you get a spark... bu...


So, how DO I charge a 6V SLA battery?

Started by Anonymous in sci.electronics.basics10 years ago 26 replies

I bought a 6V, 6Ah battery from Home Depot to power my 3-year-old's toy electric car (the kind that a kid can ride). The previous...

I bought a 6V, 6Ah battery from Home Depot to power my 3-year-old's toy electric car (the kind that a kid can ride). The previous battery didn't hold a charge when I bought the car. One reference from batteryuniversity.com mentioned something about 2.50V per cell for SLA batteries. I'm assuming my battery has 3 cells. Another website mentions use of an L200 voltage regulating chip (http...