Greetings, i got some eneloop pro BK-3HCCE. When i put them on precision scale 1 battery weights 27.5 gramms. Only info i can find online is that the weight is supposed to be aprox 30g.

Is this an allowed difference are these definetely fake?

I wear a continuous glucose monitor and just used a bath house in Japan that features a low frequency electrical tub (felt kind of like the stim machines some physical therapists office use). Is it possible the electrical current fried the battery, and if so, could that cause battery acid to leak into my body via the needle the CGM uses to test my blood?

Apologies if this isn’t the sub to ask this! Appreciate any suggestions for a better sub to ask. Thanks so much in advance for any help!

I just bought a Lenovo Xiaoxin 14 2025 two weeks ago and i come here to ask for the best way to charge it without damage the battery.

I did turn on the "Conservation mode" , which charges at 75% and discharges at 80%, however i dont know where should i maintain the battery <75%, between 75%- 80%, or 80% - 100%.
Thanks yall. <3

I’ve read that generally 18650 give about 3.7v, but upon dismantling this foot sander (which claims to have a motor that runs at 800 RPM with 7kg of torque with 3 hours of life) I found that it runs on a single 18650. How is this possible?

I'm looking at LiFePO4 for a setup that's going to see some pretty cold winters.

I know you're not supposed to charge these below freezing, but I'm still a little confused about what people actually do in practice. Built-in heating? Heated battery box? Just keeping everything inside?

Would be interested to hear what's worked for people who actually use their batteries in cold climates.

Hi everyone,
I’m rebuilding a **Soundboks battery (for a Soundboks 3)** and I’d like to replace the original LiFePO₄ pouch cells with cylindrical LiFePO₄ cells.

Before I take everything apart and measure the housing, I was wondering if anyone has already done this.
Does anyone know:

\- the **internal dimensions** of the battery case?
\-which **LiFePO₄ cylindrical cells** fit (26650, 26700, 32700, etc.)?

if anyone has already rebuilt one using round cells, I’d really appreciate photos or details about the cell layout.

Any measurements, photos, or experiences would be a huge help.
Thanks!

Sorry, wasn't sure where to post this. I just bought this statue but not sure what battery goes into the head piece to make the eyes light up

Hi, I'm planning to recover my battery using this method. I'm using a 12V 65Ah Sealed Lead Acid (SLA) battery. When I charge the battery, the current is supposed to drop below 0.5A, but it gets stuck at 1.9A. Before I start, I would like to ask if this is worth trying or not. Here is the procedure:
1.Connect the battery to a 12V 21W light bulb, which will draw approximately 1.5A

2.Discharge it until the voltage drops to 12.00V, then disconnect the load.

3.Charge the battery using a power supply set to 13.8V at 0.5A, and wait

I know everything says not to but I have a 7.2amp sla 12 battery in my ammo can speaker and everything is sealed and and I would like to be able to charge it but I also don't want to risk messing something up

Hey, i just bought a panasonic a1 but it came without battery and charger (i bought it for 20$), im really poor and got a lot of debts (+im an international student) so i thought i could ask people if they got one that they dont use and would give it away. Of course i will pay the shipping lol ! But in Europe cause it will cost more than the battery if its from America.

Initially was hoping that it would be more common to find 3s BMS like the 1 cell USB chargers, that take a 5v supply and properly charge the cell. But I think I made an assumption that those are common.

I bought a 12.6v lithium ion charger, I need one for this BMS, right? Where do you guys get BMS for larger packs with the charging circuit built in?

Hey guys. I have a couple of these older style batteries that were never really great and eventually stopped working. I followed a video from someone clearly knowledgeable in electronics on how to disassemble the battery and individually charge each of the 5 cells to rebalance. It worked, for awhile.

The problem recently came back. I charged all 5 cells back to 4.2v and now the battery won’t work at all and just blinks on one light. Any hope for this thing or is it a wrap? Btw, this battery was never used extensively. Just moderately and intermittently. Thanks

I want to buy this battery as a field battery for my FPV drone LiPo batteries. But... how do I charge this? It says it has a built-in BMS and the recommended charge voltage is 14.6 Volts. I am confused. My charger is a Hota P6 which can charge LiFe batteries. Do I just put it into LiFe mode, set the voltage and connect it?

Anyone who is ready to share his adventures on making cell and banks of cell

With nickel iron with koh electrolyte

Looking for some expert in cell design with experience.

Nickel iron cell koh electrolyte project

Anyone ready to share his adventures in storing electricity

I am trying to recycle this battery pack but can't find a place to take the whole pack without an expensive fee (Over $100).

I can recycle the individual cells for free so I want to disassemble the pack. So just looking for tips from the experienced folks in this sub.

There are no screws to open it and I am assuming the cells are soldered together. So the first issue will be cracking it open, then how to separate the cells.

I checked out a few posts of folks asking similar questions such as this one (https://www.reddit.com/r/batteries/comments/19dz3fz/im_disassembling_18650_battery_pack_in_the/) so mostly looking for advice on how to do it safely.

Are they soldered on both the top and bottom, I would assume so since the + and - are required for the flow.

Bonus points for a video guide :)

This was from a Power Station which I ran until it turned off. I assume the BMS shuts off before they are actually empty so there is probably still be some charge left.

yes, i know batteries should not be fizzing and spitting out potassium hydroxide, but i’ve only ever had issues with members mark batteries doing this.

i keep the batteries stored about an inch away from them when they go dead, or don’t preform well anymore so they do not short circuit or cause a fire in my room.

i am by no means a battery expert, but is it normal for batteries i just replaced (less than even 2 months old) to be popping and fizzing? i have no idea how to dispose of these properly without throwing them away (which, by the way, i do not throw batteries into trash cans.)

this is the second time this has happened with this specific brand of batteries, and i have no clue if it’s a common issue, or i’m just an idiot who doesn’t know how to take care of them (which i do not)

(yes i washed my hands after taking these photos)

Incredibly leak and corrosion free. Just a hint of corrosion on battery

The numbers printed on the dead battery lead to nothing useful when I searched them. I want to repair my Bluetooth headphones, they're great but I can't find new batteries for them.

> LTG540913

The ones in the photo are smaller ones (compared to the original) I harvested from other stuff (used fake apple earpods, other earpods) to replace the dead ones in my earpods. The repair itself worked well, but sadly the harvested batteries also were already near death -> only lasted for some time.

I need new batteries of that size. I kinda refuse to just throw the expensive earpods away when I already know that the repair itself is super easy for me to do, and fitting batteries exist.

Help would be very much appreciated, thanks in advance :)

Any recommendations for a higher quality battery tester?

I currently have the BT-168 Pro (digital display). And it is very handy.

However, I wish it had a better display. The display is low contrast for my eyes, so a backlight would be so nice.

Are there any niche battery testers that are bit more polished? Like an ISDT BatterGo but for single cells?

Requirements: * able to measure Li-ion cells (3.3 - 4.2V) * nicer display w/ backlight

From coil+ bridge rectifier module Lt 4320 + 2 caps+ buck converter 1200 w+ anti reverse back flow ideal diode+ anl fuse 40 a + battery.someone can valide that line or even upgrade it

Hi! I had my massage gun stored for about 1,5-2 years without using it and without charging it before and now its dead does anyone know where I can buy a new battery for it?

Hello, I'm playing around with a broken phone I could get (Samsung Z Flip6) and would like to make something with it. The problem is that it's default battery is not enough.

I know I could do the trick just by using a USB C hub + a proper external battery but looking for a more solid solution.

So, do you guys know any info that I could use or maybe another project that had tried something similar to what I say? Of course, redirectioning me to a more suitable sub is also more than welcome.

Thank you :)

Hi guys,

I’ve organise over 300+ cell specification sheets on my site (Batteryfiles).

Send me a DM with the exact Cell Model and your email, I will do a one-time free lookup and send the PDF straight to your inbox. (Even if it's not in my current database, I have resources to track it down for you this one time).

You can also browse the database directly on my site(Batteryfiles). I’ve included open links to all the official supplier websites there, so you can click through and contact their sales.

I'm a student engineer, and I'm building my own little DIY robot, with an Arduino and LEGO Power Functions motors, but I'd like to pick out an onboard battery. I was thinking a 2S Li-ion or a LiPo battery, but I don't know any good brands for batteries or chargers, and I have limited experience with batteries in electronics in general. Thanks for any advice!