Li-on Battery Question
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fossyant
Ride It Like You Stole It!
- Location
- South Manchester
I would try and get a replacement. Just needs to be same size and voltage and capacity.
Dont mess with them as they have a habit of going bang if short circuited. Most likely a dead or damaged cell in there.
Dont mess with them as they have a habit of going bang if short circuited. Most likely a dead or damaged cell in there.
Wobblers
Euthermic
- Location
- Minkowski Space
The battery's kaput. The battery voltage falling dramatically once the charging current has been removed is the classic sign of a dud cell.
For a replacement, look for a 180 mAh lithium ion pouch cell (sometimes called a lithium polymer battery: they're the same thing). Does that circuit board have any components on it? In particular, is there a device with "DW01" marked on it? If so, that's a battery protection PCB. You'll need to find a battery with a similar protection PCB - they'll be called "protected batteries", logically enough.
For a replacement, look for a 180 mAh lithium ion pouch cell (sometimes called a lithium polymer battery: they're the same thing). Does that circuit board have any components on it? In particular, is there a device with "DW01" marked on it? If so, that's a battery protection PCB. You'll need to find a battery with a similar protection PCB - they'll be called "protected batteries", logically enough.
Cycleops
Legendary Member
- Location
- Accra, Ghana
That looks swollen, as said it's fecked. Try to buy reliable brand from a trusted source and not a cheap Chinese one.
Globalti
Legendary Member
Is there any choice? Surely all batteries are made in China or Taiwan?
Cycleops
Legendary Member
- Location
- Accra, Ghana
Of course they're all far east made but I mean to avoid the ultra cheap ones which might not take many charges and fail quickly.
nickyboy
Norven Mankey
- Location
- You want hills? We got hills
They are. A reliable brand may have been subject to more rigorous design, specification and testing but they are made in the same part of the world as the cheap own brand ones
Globalti
Legendary Member
[QUOTE 5440221, member: 9609"]
I know someone who was in retail, had an excellent line that was great value but couldn't sell it, the price made it sound cheap and nasty, so she doubled the price and it sold well. its all smoke and mirrors now.[/QUOTE]
This. In most areas of retail if something is cheap people won't think it's any good and it certainly won't impress their friends. Why do we think iPhones are so expensive? Why did Burberry destroy millions of Dollars worth of unsold stock? To prevent it from falling into the hands of the discounters.
I know someone who was in retail, had an excellent line that was great value but couldn't sell it, the price made it sound cheap and nasty, so she doubled the price and it sold well. its all smoke and mirrors now.[/QUOTE]
This. In most areas of retail if something is cheap people won't think it's any good and it certainly won't impress their friends. Why do we think iPhones are so expensive? Why did Burberry destroy millions of Dollars worth of unsold stock? To prevent it from falling into the hands of the discounters.
tamiya
Well-Known Member
- Location
- AU, MY, SG
Lipo pouch cells are industrial commodity, no huge difference between any of the ones offered. The better makers used to take better effort drying the goo inside so they wouldn't puff as fast, but nowadays that's rare any are bad.
Lipos are only good for 500-1000cycles so lifespan is finite. Fast charging & high heat positions are tough life for them.
There's another overriding caveat though, lipos have a shelf life which starts from day they're manufactured; 12-18mths is my rule of thumb.
Lipos are only good for 500-1000cycles so lifespan is finite. Fast charging & high heat positions are tough life for them.
There's another overriding caveat though, lipos have a shelf life which starts from day they're manufactured; 12-18mths is my rule of thumb.
simonali
Guru
Panasonic Eneloop batteries are made in Japan. Tesla car batteries are made in the USA. That's just two examples off the top of my head that disprove your sweeping statement of incorrectness.
I'm going against consensus. I think the battery is fine. I think there's a broken wire. I think said broken wire is giving you a variable resistance depending on how the internal break is positioned.
2 things you said support my theory. Firstly, you said the voltage is constantly in range at the terminals but is only dubious when measured on the wires. Secondly you said that when charging, voltage is consistent. A fully charged battery is near infinite resistance up to the rated voltage. That means by comparison any resistance in the feed will be insignificant.
All that said, if you're not confident with a soldering iron, I'd just replace the battery anyway.
2 things you said support my theory. Firstly, you said the voltage is constantly in range at the terminals but is only dubious when measured on the wires. Secondly you said that when charging, voltage is consistent. A fully charged battery is near infinite resistance up to the rated voltage. That means by comparison any resistance in the feed will be insignificant.
All that said, if you're not confident with a soldering iron, I'd just replace the battery anyway.
tamiya
Well-Known Member
- Location
- AU, MY, SG
Lipo batteries are nominally 3.7V/cell; fully charged they are up to 4.2V (but to be safe most devices charge to about 4.05-4.10V). They mustn't be discharged until flat... generally 3.0V/cell is as low as I'd call safe. Anything lower they'll puff when you fast charge them again.
There's also a nominated discharge rate depending on manufacturer's ratings; exceed this & they'll puff. Get too hot, they'll puff. Too old, they'll puff. Overcharge, they'll puff.
If they puff until the foil sack ruptures, the chemicals inside start mixing together & there'll be an exothermic reaction.
There's also a nominated discharge rate depending on manufacturer's ratings; exceed this & they'll puff. Get too hot, they'll puff. Too old, they'll puff. Overcharge, they'll puff.
If they puff until the foil sack ruptures, the chemicals inside start mixing together & there'll be an exothermic reaction.
Sounds awesome. What's one of them?
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
tamiya
Well-Known Member
- Location
- AU, MY, SG
Usually a whoosh, a flash and then a fire.
nah it's more like bubblebubblebubblecracklecrackle (as the rest of the foil/plastics melt) then wooooof (when something flammable nearby catches alight)
The exothermic reaction is not a fire itself, it cannot be extinguished like a combustion fire.
If one mucks about with lipos regularly... some keep a bucket of sand nearby, I rest my big lipo packs in a glassfibre bag when charging. Others go into a steel ammo case for storage. IMHO biggest danger is during charging so I want to be in attendance; precautions are mainly reducing flammable materials within reach & having a container I can grab to toss the whole lot out the window... :P
