mailto: blog -at- heyrick -dot- eu

Mom's ghost is trolling me

Found damp and on the floor covered in old cobwebs. This was practically the last thing I discovered on Sunday...

Trolling me
Trolling me.

I didn't mention this on Sunday as it was late and I wanted to eat, and I didn't mention this yesterday as I set out to mow the driveway and, well, you know how it is...


Commenting on comments

Looking at the comments, I can't "get a sheep". This is a French rural community. So sheep (singular or plural) need upkeep, checkups, vet visits, and all the rest of it. Rural meaning you can't mess with the neighbour's livestock, and French meaning every piece of paper needs to be in triplicate and cross-referenced to other papers in an endless spiral that would befit a dystopian vision such as Brazil. Heck, even the Frenchies mock the beaurocracy.


Door to door salesmen aren't really a thing in rural areas. Pikeys, on the other hand... 🤬
I don't mind the Witnesses, they're always polite, speak good English, and are amusing to troll. But I think they got the message last time when I gave up on trying to argue God's fallibility regarding Satan's existence in a universe He apparently created (because their reasoning process is twisted beyond the point of parody), and instead simply said three words:

Explain childhood leukemia.

Shame, really, as I used to enjoy openly mocking the various holy figures in The Watchtower pamphlets, like pointing out the obvious that Jesus would not have looked like Chuck Norris, but more like Yasser Arafat. After all, guys, exactly where is The Holy Land?


Finally, I won't be selling towels at a boot sale. Did it once. Mind-numbingly boring. And when you're selling stuff cheap (like some of mom's unwanted books at €0,50 each), people are still going to ask dumb questions like "will you accept 40 for it?", while offering a two euro coin...


A rechargable AA cell

A nifty idea, hide a Li-Ion cell in an AA sized battery and give it a micro-USB plug for easy charging.

Taking rechargeable battery literally
Taking "rechargeable battery" literally!

This one, by the way, had failed. Zero volts output, and it just got hot trying to charge (the controller part, not the battery itself).
Which makes it a volunteer for a teardown.

Undo the film, we can see what's underneath.

How the battery is constructed
How the battery is constructed.

The plastic shell can be prised off to reveal the viscera.

What's inside the insides
What's inside the insides.

Here's the socket side of the board. Not terribly interesting. I can't make out any markings on those three black blobs. So I'm going to guess just resistors. The two side by side, one reads 6.9K and seems to be sort of between the +5V and the battery +ve (72K). The other 51.5K with one side connected to the -ve. The one by where it says GND is 1K, and is 19K off a connection to -ve.
In case it wasn't obvious, these readings are in-circuit so take with a pinch of salt.

Not much to see here
Not much to see here.

The component side, however...

Where the magic happens
Where the magic happens.

Three chips. On the left, an S8050 (marked J3Y) high current general purpose NPN transistor.
In the middle, a TL432 adjustable voltage reference.
And on the right, an AE9T N-channel power MOSFET.

I'm not going to Big Clive it and make a schematic, suffice to say what I think is going on here is the input power is shunted into the battery via the MOSFET, using the voltage reference chip to drop the voltage from the USB 5V. I think the J3Y is being used to automatically cut off the charging (and turn the red LED blue) when a certain level is reached indicating that the battery has been charged.

It's worth noting that I plugged the circuit as shown into a USB power source, and it had 1.37V between the micro USB socket shielding (connected to the battery -ve) and the spring (connected to the battery +ve).


I have a little model helicopter. The power source is a 3.7V Li-Ion cell that looks like an electrolytic capacitor. The control handset has a flying lead that can charge the cell. How does it do this? By dumping about 7.8V (from six AA cells) directly into a 3.7V Li-Ion cell with no protection whatsoever. Oh, the horror.

The helicopter is quite happy powering up using one of my drone's battery packs, but given those are quite a bit larger, it is only able to get a few millimetres off the ground (at which point it becomes unstable, tips over, thrashes around pathetically, etc).
Oddly enough, I wasn't able to find a replacement on Amazon. There were a few "super capacitors", but I'm not sure they're the same thing, and I'm certainly not going to dump seven volts into anything and "hope for the best". That's the sort of nonsense that causes these things to go "bang".

Speaking of bang, I took the Li-Ion cell from the above battery can hit it lightly with the pickaxe. It didn't blow up, or even steam. It just got somewhat flatter with a notable dent. Well, I say "dent", more like two halves barely connected. Kind of disappointing. I was hoping for an explosion that would wreck half the house and obliterate me in a way that journos around the world would say "nope, this is made up". ☺
But, alas, not so much as a whimper.



Your comments:

Please note that while I check this page every so often, I am not able to control what users write; therefore I disclaim all liability for unpleasant and/or infringing and/or defamatory material. Undesired content will be removed as soon as it is noticed. By leaving a comment, you agree not to post material that is illegal or in bad taste, and you should be aware that the time and your IP address are both recorded, should it be necessary to find out who you are. Oh, and don't bother trying to inline HTML. I'm not that stupid! ☺ ADDING COMMENTS DOES NOT WORK IF READING TRANSLATED VERSIONS.
You can now follow comment additions with the comment RSS feed. This is distinct from the b.log RSS feed, so you can subscribe to one or both as you wish.

Rob, 7th June 2023, 00:28
You only get the special effects from a damaged lithium cell if they were fully charged. Shorting them out dumps the energy quickly enough that they get hot enough to catch fire and burn. A flat battery means no energy to heat things up. And thank goodness, given the number of flattened single-use vapes I see run-over on the roads.
John, 7th June 2023, 21:30
A propos sheep: Goats, however, are often seen tethered to a fixed stake to clear land. They'll clear almost anything (remember those brambles?) and can often be hired or borrowed. They need water, and a portable shelter can be useful if left over a period remotely (borrowed from a friendly <i>agriculteur</i>, or supplied with the goat. But at your place you have an abundance of shelters, outhouses &c If DIYing, a chain tether is obligatory. 
Be company for you as well, undemanding,even if bad-tempered, and costs nothing to feed whilst working continuously. No belts or moving parts to replace! one big metal post and a bucket of water, replenish daily and move stake as required. 
you could raise one from a kid and satisfy any paternal instincts as well. The more I think about it the better a solution it becomes. And at the end of its lifespan, goat curry! 
John, 7th June 2023, 21:33
They even eat towels! Well known for it!
David Pilling, 7th June 2023, 22:53
choppers and lion cells. Small cells which are not round, are commonly and cheaply available. Lots of different physical sizes - maybe big clive would salvage from discarded e-cigs. Place to look is Ali-Express, but want - lots here, but very expensive, compared to my memory, perhaps things have changed: _fr_FR=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=2ZN0V67MB4D1C&sprefi x=rechargeable+lipo+battery%2Caps%2C87&ref=nb_sb_noss 
At least is this what it looks like. I have small helio, so I do know. 
Guess as a kid I would search the streets for cigarette butts, now you have to do it to find e-waste. Flash cubes were a favourite to collect. 
Is there any grazing animal that does not need a licence - alpacca(?) - they're all probably too close to farm animals to be left uncontrolled. Micro-donkeys. Everyone on the TV has a micro-donkey. 

Sorry, comments cannot be added at this time.
Please try again later.


French flagSpanish flagJapanese flag
«   June 2023   »

(Felicity? Marte? Find out!)

Last 5 entries

List all b.log entries

Return to the site index



Search Rick's b.log!

PS: Don't try to be clever.
It's a simple substring match.


QR code

Valid HTML 4.01 Transitional
Valid CSS
Valid RSS 2.0


© 2023 Rick Murray
This web page is licenced for your personal, private, non-commercial use only. No automated processing by advertising systems is permitted.
RIPA notice: No consent is given for interception of page transmission.


Have you noticed the watermarks on pictures?
Next entry - 2023/06/08
Return to top of page