battery

I want to use an off-the-shelf LPWAN radio product -- which has mesh networking capability and features an embedded microcontroller -- to sample a 12V battery's voltage. I don't want to do it often, so I'll configure the radio's interface to do synchronized sleep routines to wake it up and...

Hi everyone! Recently I got hold of a bunch of Saft CVH 170KA Ni-Cd cells. But I'm having some difficulty locating its data sheet. Anyone here has an idea what might be the cells capacity (Ah) or has its data sheet? Thank you

Hi everyone, I am new to the forum I have a Rechargeable Li-ion battery that nominal voltage is 7.2 vdc with maximum charge voltage is 8.4 vdc. I want make battery discharge auto cut off when battery is 7.00 vdc its automatically stop. I have included an image that my currently simple circuit...

I'm a beginner and am designing a battery-powered device. - When the power supply is connected, charge the battery while supplying power to the load (red line in the photo). - When the power supply is disconnected, supply power from the battery to the load (blue line in the photo). I'd like to...

We are designing a 16 cell BMS using TI's BQ76940 IC and we want to ask for a schematic review to catch anything that we missed. We are also using some DC-DC coverters so it'll be great if you can look at it at a system view. Please do let me know if you need any other information, I have...

Hi everyone, I’m looking for an LED light with the following specifications: Timer function (optional): Preferably a 6/18-hour timer (turns off after 6 hours and on again after 18). The timer is not essential, but would be nice to have. Power: Runs on 2x AA batteries. Size: Around 13 x 5 cm...

Hello, I hope this is the correct forum; I'm new. So, I have a 7.4v/2800mA/20w battery I salvaged from a portable DVD player that went kaput. I wanted to test the yellow wire (the battery has three wires: red, yellow, and black), which Co-Pilot said was likely connected to a thermistor. Here's...

Hi folks. I've been trying to source a battery for a Bushnell golf watch. Bushnell ION 2. The latest model is Bushnell NEO-ION. So far I can get a battery from China that has a lead time of 2 months. Not helpful. I can also get said battery from the US, but must buy a minimum of 10. Again not...

** Please forgive me if this is not the proper forum for my question ** I am looking for repair assistance or parts availability information regarding my Harman Kardon Onyx Studio 3 portable speaker. Its internal Li-ion battery became depleted. I replaced it, the speaker now operates but it...

Hello, I am new here, i want another comment if the schematic design i made is appropriate to what i want and needed advice or confirmation about it.

Car: 2019 Lexus IS350 Link for lights at bottom of page. Link for piggyback at bottom of page. Link for Fuse box diagram at bottom of page. I am currently trying to figure out how to power my 10 puddle lights that will go under the car. But the things is I want to have two power source. One...

Problem: I have a 10s 36V li-ion battery pack powering my load (resistor used as example). When the charger is connected I would like the load to be cutoff as well as charge the battery. In my current set up I have the load being cut off when the charger is connected through the pmos but the...

I am trying to replace the rechargeable Sanyo ML2430-HZ1 batteries (x4) in a sailing computer, as per this tutorial - https://www.instructables.com/Tack-Tick-RaceMaster-Battery-Replacement-33/ As I understand it, the ML2430 (at least the Sanyo one) stopped being produced in 2020, so I need an...

Hi all, I need your ideas again. I am trying to convert a trusty 8 year-old device (Braun Face) from an AA battery into a rechargeable. (they make rechargeable versions of this now). (It is too much hassle opening and closing the battery compartment on these. You need a coin to twist the base...

I need suggestions for a diode or some type of one way “valve” for a wire in my car. I recently wired up a fuel pump relay with 2 power sources to control the relay. But I need suggestions for a diode to add to one of the wires to prevent backfeeding. I used a zener diode with a Vz of 12v but it...

Hi All, I'm relatively new to design, so I would sincerely appreciate any help, advice and feedback to get me started on the right direction. Here's the scoop: I'm designing a battery powered tracking device. This is device is powered using a CR2450X battery by Murata. I have linked the data...

I need help from professionals with my Active Cell Balancer Circuit. Basically, I am trying to make an active cell balancer using the STM32 microcontroller. The MOSFET I plan to use is the IRFZ44N, along with the TC4422 IC driver. I will measure the battery cell voltages via the ADC of the...

Hello, as the title states my objective is to wire in parallel the output from two or more MPPTs, to charge a battery and power a load at the same time. As far as I understand to parallel two normal DC-DC power supplies there must be some sort of load sharing or synchronization capability, but...

"This schematic is for a lead-acid battery charger circuit. I've set up this circuit, but it's only charging at about 15 milliamps. Can anyone help me troubleshoot this problem? By the way, all component values are according to the schematic, except I used a 13-volt transformer instead of a...

Hi everyone! My friend and I are working on designing a battery pack for our e-bike and would love some advice and consultation from anyone with experience in this area. We’re pretty new to this and are still learning about the constraints, limitations, and what to consider in terms of design...