I bought an HP3596B off Ebay. I have a service manual on order. First thing I did was remove the leaky battery and thoroughly clean the PS...

I bought an HP3596B off Ebay. I have a service manual on order. First thing I did was remove the leaky battery and thoroughly clean the PS board. It looks good, however if I look down to the edge connector inside the unit I can see it has the blue buildup on it from the battery leak. I'll save that until I disassemble to clean and lube the switches. At power up the self calibrati...

fred.flintstone@thecave.com wrote in news:a0fa48poski1u7imevrk3jviugam1if5qc@4ax.com: > My computer clock battery died. It had a CR2032. I...

fred.flintstone@thecave.com wrote in news:a0fa48poski1u7imevrk3jviugam1if5qc@4ax.com: > My computer clock battery died. It had a CR2032. I bought a CR2025 at > a store going out of business (No Returns). Both say they are 3v. The > CR2025 is a little thinner, but otherwise they are the same size. Is > there any reason not to use the 2025? > > -------------- > > To thin to fi

Greetings, Gentlemen, What's the simplest way of implementing this: The 'quiescent voltage' (so to speak) of a car battery is typically...

Greetings, Gentlemen, What's the simplest way of implementing this: The 'quiescent voltage' (so to speak) of a car battery is typically 12.4V. With the engine running, however, this rises to 14V due to the charging current from the alternator. How most reliably to sense when the battery voltage exceeds 13V so a dashcam can be activated? -- This message may be freely reproduced...

I would like to buy a NP 4-6 Yuasa 6 Volt 4 Amp Hour Battery. Would this charger work and how do I determine how long to recharge a discharged...

I would like to buy a NP 4-6 Yuasa 6 Volt 4 Amp Hour Battery. Would this charger work and how do I determine how long to recharge a discharged battery ? Model: HB-0702-01 Input: AC100-240V 50-60Hz 0.2A Output: DC7.2V 1.0A I would be powering some led lights that operate at 3.0 volts, so I would need to find out how to step down the voltage as well. Thanks.

I have an old portable CD player, still works. Runs on 2 AA batteries. The other day, a CD was skipping, on the third track. I tolerated...

I have an old portable CD player, still works. Runs on 2 AA batteries. The other day, a CD was skipping, on the third track. I tolerated it for a minute, then forwarded. Other tracks also damaged. The battery charge indicator read zero. Dead battery or smushy disc? I pop in another CD, works fine. Try the bad CD again, same symptoms repeated. How does a dodgy disc muck ...

I have one of these: . Long out of warranty. I was using it yesterday and afterward noticed that the case was being pushed open by a...

I have one of these: . Long out of warranty. I was using it yesterday and afterward noticed that the case was being pushed open by a swelling battery. I opened the case and indeed the battery is very swollen. Obviously I didn't try to recharge the unit. I put it outside in the shade on a metal table, How should I dispose of this?

Here is a pretty good discussion (if a bit long winded) of battery life in BEVs. It also explains a lot about why batteries in mobile devices...

Here is a pretty good discussion (if a bit long winded) of battery life in BEVs. It also explains a lot about why batteries in mobile devices have the lifespan they do. https://www.youtube.com/watch?v=IHz-Kx5h_Tw -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209

...

https://www.msn.com/en-us/autos/news/while-they-were-asleep-their-teslas-burned-in-the-garage-it -e2-80-99s-a-risk-many-automakers-are-taking-seriously/ar-AAMVBlV https://www.theguardian.com/australia-news/2021/aug/02/tesla-big-battery-fire-in-victoria-burns- into-day-three

https://www.cmblu.com/en/technology/ Looks like it's best suited for LARGE backup power generation for solar and wind farms. Demo-pilot...

https://www.cmblu.com/en/technology/ Looks like it's best suited for LARGE backup power generation for solar and wind farms. Demo-pilot presently being installed in Milwaukee: https://cleantechnica.com/2023/02/10/solar-wave-sets-the-stage-for-new-flow-battery-in-wisconsin /

Hi, I guess this device likely uses a 1mOhm Rds(on) nfet with a gate driver since it can operate as a low side or high side switch, controlled...

Hi, I guess this device likely uses a 1mOhm Rds(on) nfet with a gate driver since it can operate as a low side or high side switch, controlled by a microcontroller. It has a 10ms rated current of 2400A. It would be cool if the under voltage cutoff could be adjustable, ie this device could be useful to use for a supercapacitor hybrid battery potentially and not just lead acid batteries....

Attention, this is one of those rare electronics-related questions :-) Will be rigging up a small power-failure backup system. Essentially a...

Attention, this is one of those rare electronics-related questions :-) Will be rigging up a small power-failure backup system. Essentially a 12V LiFePO4 battery (with BMS in there), inverter, solar panels, MPPT charger. When reading up on stuff and talking to people I found something very disconcerting. It seems that MPPT charge controllers can and often do commit suicide when operat...

Normally, the number CR2354 specifies a battery completely. The CR refers to the chemistry and the 2354 defines the size. But there are multiple...

Normally, the number CR2354 specifies a battery completely. The CR refers to the chemistry and the 2354 defines the size. But there are multiple case shapes in this particular size. What's up with that? https://www.ebay.com/itm/233116431435 https://m.media-amazon.com/images/I/51BKvS6pUkL._AC_SL1000_.jpg One of these will fit and the other won't. What's the point of having sizes, ...

Well I've received my M48T86PC1 Cmos Clock Lithium Battery as a gift from China, according to the custom declaration. It is an ST...

Well I've received my M48T86PC1 Cmos Clock Lithium Battery as a gift from China, according to the custom declaration. It is an ST microelectronics part, my concern is the manufacturing date. The Chip is labeled as below, M48T86PC1 Real-Time Clock Contains Lithium Cell 990SN VH MYS 99 1033 WO723Y I hate s...

I am working on a simple USB charging circuit. Normally, the 3.6V NiMH bat= tery is connected to the device via the NC contacts of a relay. ...

I am working on a simple USB charging circuit. Normally, the 3.6V NiMH bat= tery is connected to the device via the NC contacts of a relay. When conne= cted, a 5V relay switch the battery to charge via a diode. So, a fully char= ged battery is around 4.2V. As someone suggested, i will put a parallel R = & C to reduce the hold current of the relay.=20 Questions: 1. What is the minimum ...

My trusty old Russky meter died and I can't be sans analog meter for long. Must be cheap and simple because they get dropped, crushed,...

My trusty old Russky meter died and I can't be sans analog meter for long. Must be cheap and simple because they get dropped, crushed, snatched, whatever. Has anyone used the HM-102S while in the service? https://www.amazon.com/SOLTEC-HM-102S-Analog-Multimeter-VOLTS/dp/B01M1ETSF9 Why do these need a 9V battery? At 20k/V input impedance that just doesn't make sense. -- Regards, Joe...

A client came to me with a battery design that isn't meeting lifetime spec. The unit is a small transmitter to track people in hospital type...

A client came to me with a battery design that isn't meeting lifetime spec. The unit is a small transmitter to track people in hospital type environments. The circuit runs off of a 3v battery. There is a 60k resistor from gpio output to the base of common emitter 3904. The collector is tied to one end of ferrite antenna. Other end is tied to 3v. 3904 is used between oscillator and the ferri...

I am using these batteries. Discharging from the (BMS managed side) 8 pins connector seems OK, but charging is not working. It might need the I2C...

I am using these batteries. Discharging from the (BMS managed side) 8 pins connector seems OK, but charging is not working. It might need the I2C control to enable charging? With the battery at 10V, hooking up a 11V supply doesn't seem to do any thing, with the voltage coming up to 11V immediately. Someone reported good result with 12V+ adjustable supply. Hooking up to the inte

I have two Harbor Freight digital calipers, item #47257, and I've had=20 problems with one of them especially, where the display will go blank....

I have two Harbor Freight digital calipers, item #47257, and I've had=20 problems with one of them especially, where the display will go blank. = It=20 seemed to work sometimes if I squeezed the enclosure, and I thought it = was a=20 bad battery or bad connection. But a fresh battery didn't work. So I took it apart, which meant peeling off a foil backing to expose = four=20 small phillip...

In my search for a 8 to 10V, 500A source, needed for 2 seconds, I've been looking at LiFePO4, and LTO (Lithium Titanate) cells, in 38120...

In my search for a 8 to 10V, 500A source, needed for 2 seconds, I've been looking at LiFePO4, and LTO (Lithium Titanate) cells, in 38120 and 66160 sizes. All types of suppliers, plus completed battery systems, with charge balancing electronics. Sheesh, it's enough to make one's head spin. BTW, a simple "12V" battery has a bit too much voltage, an extra burden on power MOSFET(s)...

The Daly-Antra types of BMS (Battery Monitor Switch) require charging current before they'll turn on. Unfortunately, most 'smart'...

The Daly-Antra types of BMS (Battery Monitor Switch) require charging current before they'll turn on. Unfortunately, most 'smart' inverter/chargers won't turn on until the battery is connected, so guess what happens when a Daly-Antra BMS is used? Nada. That's what happens when a Daly-Antra . . . . They supply a Blue-Tooth dongle that plugs into their UART port, for remote monito...