Electric vehicle batteries are about 85% efficient, but the 15% of the energy that you put in that you don't get out has to appear as heat,...

Electric vehicle batteries are about 85% efficient, but the 15% of the energy that you put in that you don't get out has to appear as heat, generated in the battery. The worst case would presumably be during fast charging. One has to wonder whether anybody has built a battery with heat-pipe down the middle, sticking into heat-sink extrusions projecting from either end. Nobody seems to do...

I was at the hardware store, needed some screws, other stuff. Found a 5 Euro digital multimeter with transistor hfe test for 5 Euro. .5%...

I was at the hardware store, needed some screws, other stuff. Found a 5 Euro digital multimeter with transistor hfe test for 5 Euro. .5% accuracy on DC it says. Did not need it, but could not resist. Took it home, did not expect it to have a battery in it, for that price. But it did, and it was new and full.... Looked up the price of a new 9 V battery on conrad.nl: 4 Euro 9 cents http://ww...

Hi all, Recap- I had the low Cmos Clock Lithium Battery in a computer. I received a Cmos Clock Lithium Battery from China, had some question...

Hi all, Recap- I had the low Cmos Clock Lithium Battery in a computer. I received a Cmos Clock Lithium Battery from China, had some question about the date code. I installed the Cmos Clock Lithium Battery and had the same message low CMOS battery. I order a new one from Mouser and the computer now works properly. Now I'm onto making the computer control some HP equipment via GPIB, whi...

Ima try using a lower power USB wall adapter. Was using 2 A at 5 V. Will try a 1 A at 5 V adapter. The battery was getting quite warm,...

Ima try using a lower power USB wall adapter. Was using 2 A at 5 V. Will try a 1 A at 5 V adapter. The battery was getting quite warm, apparently every time the smartphone felt the need to recharge it, hopefully not due to overcharging. Now, with the 1 A USB adapter, seems the battery is cool even though it's charging. Won't mess with it if it doesn't get warm again. Being able to sp...

I am not planning to do so, just curious... Using a five amp hour 18 V (20 V Max) battery. At 1 million V, that would be somewhere around 3...

I am not planning to do so, just curious... Using a five amp hour 18 V (20 V Max) battery. At 1 million V, that would be somewhere around 3 A for one second? Sounds like a LOT of energy. Thanks.

Seems to me that is an important question, no matter what alleged device protection there is. I would want to know what the highest...

Seems to me that is an important question, no matter what alleged device protection there is. I would want to know what the highest INDIVIDUAL battery temperature is. I would want an alarm when any battery reaches X degrees. Doesn't matter how many batteries there are. The more batteries, the more important for the driver to know what's going on. I suppose they do not keep track of...

Today's NYT describes a nasty fire in an apartment building in Manhattan, started by a bicycle battery. There have been 200 battery-ignited...

Today's NYT describes a nasty fire in an apartment building in Manhattan, started by a bicycle battery. There have been 200 battery-ignited fires in Manhattan so far this year, with six deaths. Unless battery quality improves somehow, buildings will need fireproof vaults for parking bikes and scooters. I see lots of electric scooters and bikes on the streets of San Francisco lately. Some ...

The battery in my phone burned out, so I ordered a replacement from Amazon. Examining the case, I can't find any fasteners. Do I open it...

The battery in my phone burned out, so I ordered a replacement from Amazon. Examining the case, I can't find any fasteners. Do I open it with an oyster knife? -- Rich

Critics of Tesla have long warned that investors should brace themselves for competition from other EV makers, and GM is a case in point. GM has...

Critics of Tesla have long warned that investors should brace themselves for competition from other EV makers, and GM is a case in point. GM has just dialed its EV battery supply chain up to 11, and the company is also building on its decades-long experience with fuel cells to dip into the green hydrogen trend. The big EV battery news from GM is a $2.5 billion loan, announced by the

New design for lithium-air battery could offer much longer driving range compared with the lithium-ion battery ...

New design for lithium-air battery could offer much longer driving range compared with the lithium-ion battery https://www.sciencedaily.com/releases/2023/02/230222210559.htm

I would like to find out how long to charge the above battery. Charger puts out 500 mAh. Thanks.

I would like to find out how long to charge the above battery. Charger puts out 500 mAh. Thanks.

Hi, I am using the RTC DS1337 with a CR2032 battery. I know that when these battery shows 2.7v, it needs replacing, Although the RTC can...

Hi, I am using the RTC DS1337 with a CR2032 battery. I know that when these battery shows 2.7v, it needs replacing, Although the RTC can go down to 1.4V from the spec sheet. I even powered it through my power supply at 1.1V and it was keeping time correctly. I am only power the RTC from the battery. My question is : How low of a voltage can I go before replacing in a real life situation ? ...

Does anyone *know* what cause(s) of recent/historical battery fires (in EVs, particularly)? I assume it is not related to abuse or "usage...

Does anyone *know* what cause(s) of recent/historical battery fires (in EVs, particularly)? I assume it is not related to abuse or "usage hazards". Or, charging/BMS. But, rather, originates in manufacturing (?) Is this an issue with material (im)purities, mechanical defects, assembly faults, etc.?

I need to select a capacitor for a battery pack. I see a lot of circuits that use Alkaline batteries and then have a ceramic capacitor across the...

I need to select a capacitor for a battery pack. I see a lot of circuits that use Alkaline batteries and then have a ceramic capacitor across the leads of the series battery pack to act as a filter. My question is how do you size the cap ? I hate just looking at what someone else has done and just guess or copy. I have 4x 1.5v alkaline batteries in series powering a amplifier circuit. ...

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...

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

Tesla owners are finding out that Tesla doesn't repair damaged battery packs - they replace the ENTIRE battery at a cost of up to $22k which is...

Tesla owners are finding out that Tesla doesn't repair damaged battery packs - they replace the ENTIRE battery at a cost of up to $22k which is almost the value of the car (https://electrek.co/2021/09/13/tesla-battery-pack-replacement-repair/). One Tesla owner had a $2 part get damaged by road debris and Tesla quoted him $16,000 to replace the entire pack, so he had it towed to a sh

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.

Battery Engineering Hack Chat No comments by: Dan Maloney December 12, 2022 Join us on Wednesday, December 14 at noon Pacific for...

Battery Engineering Hack Chat No comments by: Dan Maloney December 12, 2022 Join us on Wednesday, December 14 at noon Pacific for the Battery Engineering Hack Chat with Dave Sopchak! Of all the things driving technology forward, you’d have to say that the ability of chip makers to squeeze more complex circuits than ever onto silicon has to rank right up there.

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