How to increase lithium-ion battery pack life?

Started by John Doe in sci.electronics.design10 years ago 17 replies

Does a high-quality commercial tool do enough to prolong the life of its lithium-ion battery pack? Should they be recharged whenever...

Does a high-quality commercial tool do enough to prolong the life of its lithium-ion battery pack? Should they be recharged whenever convenient instead of waiting until the tool requires recharging? I just had a lithium-ion battery pack die before it's time. I'm wondering if better handling would have prolonged its life. Seems that one of the 3 cells switched off. One cell is 3.75 ...


Will a dimmer switch work instead of an incandescent light bulb in a simple battery charger?

Started by Anonymous in sci.electronics.design8 years ago 42 replies

The other day, I came upon this: http://www.alpharubicon.com/elect/3dollarb= attggn.htm It's plans for a very simple battery charger that uses...

The other day, I came upon this: http://www.alpharubicon.com/elect/3dollarb= attggn.htm It's plans for a very simple battery charger that uses a light bulb and dio= de in series to make a constant current battery charger. Benefits include p= ulse charging for desulfation and the fact that it can charge batteries of = any voltage. Well, with incandescent light bulbs getting scarce and me ...


SSD relay - or how to charge 2 batteries at one time

Started by Sonnich Jensen in sci.electronics.design3 years ago 23 replies

Hi all I have a camper van, at it has to batteries - one for the car itself, and one for axial stuff, such as light, fridge etc for the living...

Hi all I have a camper van, at it has to batteries - one for the car itself, and one for axial stuff, such as light, fridge etc for the living area. By design there is a relay that kicks in when there are enough RPMs to also charge the axial battery. To put it simple - when starting the car, the cars battery get charged immediately, the axial battery only when I start moving. It simple put...


Wireless shoe to bicycle motor power induction

Started by Alan Folmsbee in sci.electronics.design4 years ago

Dear electronics design experts. I now propose a product you can cash in on: An electric bicycle with no battery, just induction coils in...

Dear electronics design experts. I now propose a product you can cash in on: An electric bicycle with no battery, just induction coils in the pedals. The person wears shoes with induction coils running at about 400 hz. A battery back pack or belt will power the bike wirelessly. The battery drives the shoes and magnetic fields jump over to the pedals without wires. This allows fast batte...


Maximum power point tracking using microcontroller

Started by bitrex in sci.electronics.design8 years ago 10 replies

I have a microcontroller project that needs to run at night, and I'd like to use a solar panel to charge an AA NiMH battery during the day to...

I have a microcontroller project that needs to run at night, and I'd like to use a solar panel to charge an AA NiMH battery during the day to power it. The battery will then feed a switching converter to power the project at night. I have seen some maximum power point tracking chips for battery charging, but they're relatively expensive. Since I have some extra pins on the uC availa...


PNP for soft switch and reverse battery protection

Started by Peabody in sci.electronics.design5 years ago 66 replies

I'm working on a small circuit that will be powered by a 9V battery. I would like to combine the functions of a soft power switch and reverse...

I'm working on a small circuit that will be powered by a 9V battery. I would like to combine the functions of a soft power switch and reverse battery protection in a single device. I think the answer may be to use a PNP transistor on the high side, with a base resistor to ground - actually to ground through a physical momentary switch, or indirectly to ground via an NPN transistor cont...


Backfed MOSFET current limit

Started by Tim Wescott in sci.electronics.design8 years ago 26 replies

Got a circuit. I'm using a high-side P-channel MOSFET to prevent damage when the battery is put in backwards. The FET is put in "backwards"...

Got a circuit. I'm using a high-side P-channel MOSFET to prevent damage when the battery is put in backwards. The FET is put in "backwards" (battery to drain, circuit to source) to point the body diode in the correct direction. When the battery is inserted, a capacitor on the circuit side of the FET charges up, sucking a considerable amount of current very briefly. The current is b...


Can a 12 volt regulatred power supply be used to charge car batteries?

Started by Unlisted in sci.electronics.design3 years ago 25 replies

I have a 12volt regulated power supply that was probably made for using automotive CB radios in a house. It's rated at 3 amps. Can this be...

I have a 12volt regulated power supply that was probably made for using automotive CB radios in a house. It's rated at 3 amps. Can this be used to slow charge 12V car batteries? I have a big car battery charger, which puts out 15 or 60 amps, but I want to trickle charge a battery in severe cold weather. I'm more worried about damaging the power supply than the battery.


Replacement of UPS battery

Started by Andy in sci.electronics.design4 years ago 27 replies

I am learning a lot here. What are your thoughts on this. I understand that an inverter converts dc to ac. What does the last sentence...

I am learning a lot here. What are your thoughts on this. I understand that an inverter converts dc to ac. What does the last sentence mean as far as rating of the inverter?


Battery powered 'scopes

Started by George Herold in sci.electronics.design4 years ago 3 replies

Hi, quick question: Does a battery powered 'scope have inputs that are isolated from each other? Differential inputs? And if so is there a...

Hi, quick question: Does a battery powered 'scope have inputs that are isolated from each other? Differential inputs? And if so is there a cheaper model number to look at? TIA George H.


battery charger

Started by RichD in sci.electronics.design4 months ago 5 replies

I picked up a AAA NiMh battery charger. The label reads: Output: 1.2 V 800 mA AA/AAA charging: 120 mA Why the two different current...

I picked up a AAA NiMh battery charger. The label reads: Output: 1.2 V 800 mA AA/AAA charging: 120 mA Why the two different current specs? Does not compute - -- Rich


Need design for motion sensor battery operated LED light.

Started by Anonymous in sci.electronics.design9 years ago 23 replies

Anyone have a design for a motion sensor? Sure, I could just buy the sensor for an outdoor motion sensor light, but I want a circuit to control...

Anyone have a design for a motion sensor? Sure, I could just buy the sensor for an outdoor motion sensor light, but I want a circuit to control a *battery operated* LED light. The purpose is to illuminate the inside of an outhouse (toilet) at a campground, and have it turn ON when someone enters. There is no electricity in the building. I just want something battery operated that wont be ...


controllers; program in C

Started by Anonymous in sci.electronics.design7 years ago 32 replies

Hello. I want to build, for fun, a battery charger and I want to use this as an excuse to experiment with a controller chip that you can...

Hello. I want to build, for fun, a battery charger and I want to use this as an excuse to experiment with a controller chip that you can program in C. Are PIC devices the way to go? I noticed they have a free C compiler available for some of the chips. As always, $$$ is a factor. I see several projects for battery chargers on line, posted by experimenters. I'm still asking here thou. I w...


solar/battery powered wifi camera setup advice

Started by robb in sci.electronics.design7 years ago 7 replies

so i want to setup a remote wifi camera, battery powered with solar charging. Proj Plan: choose smallest setup battery/solar panel / camera...

so i want to setup a remote wifi camera, battery powered with solar charging. Proj Plan: choose smallest setup battery/solar panel / camera that will achieve my goal Goal: Daytime only monitoring , motion detection and occasionally (2 times day connect and stream for few minutes), camera can be off from sunset to dawn. some research on web shows the cameras i am looking at var...


NiCd cell replacements

Started by Andy K in sci.electronics.design8 years ago 14 replies

I will be replacing eight cells in a battery for a cordless drill. 9.6 V The markings did not lead anywhere. DF21NF NiCd Since there are...

I will be replacing eight cells in a battery for a cordless drill. 9.6 V The markings did not lead anywhere. DF21NF NiCd Since there are eight cells in the battery, I think they are 1.2 volt nicads. 1 3/4 X 5/8 are the dimensions if that would help with determining the mAH. Could someone help me in what would be a good replacement ? Thanks.


OT new Li battery?

Started by George Herold in sci.electronics.design5 years ago 21 replies

I heard about this on the radio driving home last night. https://news.utexas.edu/2017/02/28/goodenough-introduces-new-battery-technology Here's...

I heard about this on the radio driving home last night. https://news.utexas.edu/2017/02/28/goodenough-introduces-new-battery-technology Here's the paper. https://docs.wind-watch.org/braga2017.pdf Lunch time reading. George H.


18500 Battery Clip Holder Box Case

Started by Andy K in sci.electronics.design8 years ago 4 replies

I have looked all over but can not find a battery holder for 18500 batteries. Some places list this, 18650 17500 18500 Battery Clip Holder Box...

I have looked all over but can not find a battery holder for 18500 batteries. Some places list this, 18650 17500 18500 Battery Clip Holder Box Case, but is misleading because all these batteries are different lengths. Seems if they make 18500 batteries, someone ought to have made a holder ? Thanks, Andy


LiIon solar charge controller with load output regulation?

Started by Joerg in sci.electronics.design10 years ago 12 replies

Folks, Is there a solar charge controller that provides a hard and (somewhat) regulated 12V-14V output and uses a LiIon battery? The standard...

Folks, Is there a solar charge controller that provides a hard and (somewhat) regulated 12V-14V output and uses a LiIon battery? The standard ones are like this and then the battery voltage fluctuates with the LiIon pack: http://www.solarbruder.com/charge-controller/ephc-for-li-ion-battery-pack Most are for 3-cell and then the low cut-off is around 8V. Way too low, a lot of 12V gear co...


XNRGI Battery

Started by Rick C in sci.electronics.design2 years ago 3 replies

This company seems to have a battery that will provide energy for cars and other applications with a much higher density and lighter weight than...

This company seems to have a battery that will provide energy for cars and other applications with a much higher density and lighter weight than Li-ion batteries. They talk about making "pores" in Si wafers with lithium anode material. Some of what they say is a bit odd. Since the anode is lithium, clearly the lithium is removed and redeposited during use. Yet they claim "No Li


Charger recommendations

Started by Andy in sci.electronics.design4 years ago 17 replies

I am looking at the Nitecore D4 Digicharger/Four Channel Universal Smart Battery Charger/LCD Display and GYRFALCON All-44 4 Channel Digital...

I am looking at the Nitecore D4 Digicharger/Four Channel Universal Smart Battery Charger/LCD Display and GYRFALCON All-44 4 Channel Digital Battery Charger. What do you recommend ? I read where 26650 have a higher capacity than 18650s. Andy