Long rant ahead. Should take about 2-3 minutes to read. So feel free to refill your cup of coffee and take a seat :)

It turns out that the battery in my new Nexus 6P is almost dead. Well not that I didn't expect that, the seller even explicitly put that in the product page. But it got me thinking.. why? Lithium batteries are often good for some 10k charges, meaning that they could last almost 30 years when charged every day! They'd outlive an entire generation of people!

Then I took a look at the USB-C wall charger that Huawei delivered with this thing. A 5V 3A brick. When I saw that, I immediately realized.. aah, that's why this battery crapped out after a mere 2 years.

See, while batteries are often advertised as capable of several amps (like 7A with my LiitoKala 18650 batteries that I often use in projects), that's only the current that they can safely take or deliver without blowing up. The manufacturer doesn't make this current rating with longevity in mind. It's the absolute maximum in current that a given battery can safely handle.

The longevity on the other hand directly depends on the demand that's placed on the battery. 500mA which is standard USB 2.0 rating or 1A which is standard USB 3.0 rating, no sweat. The battery will live for at least a decade of daily charges and discharges like that no problem.

But when you start shoving 3A continuous into a battery, that's when it will suffer. Imagine that your current workload is 500mA and suddenly you get shoved 6 times that work upon you. How long would you last?

Oh and not only the current is a problem, I suspect that it also overvolts the battery to maintain a constant current all the way till the end. When I charged my lithium cells with my lab bench power supply, the battery would only take a few milliamps when it got close to the supply voltage. Quick bit of knowledge: lithium cells are charged at constant current first, then when the current drops below that, it continues at constant voltage - usually 4.2 or 4.35V depending on the battery. So you'd set your lab bench power supply at 4.2V 500mA. But in that constant voltage mode, as the battery's voltage and the supply's voltage equalize, the current drops because the voltage difference becomes lower. Remember, voltage is what causes current to flow. Overvolting at the supply to stay in constant current mode all the way till the end speeds this process up but can be dangerous and requires constant monitoring of the battery voltage.

So, why does Huawei and a bunch of other manufacturers make these 3A power chargers? Well first it's because consumer demands ever more, regardless of the fact that they can just charge at 500mA for the night (8h of sleep) and charge a 4000mAh battery from 0 to 100% no problem. Secondly it's because sometimes you need that little bit of extra juice fast, like when you forgot to plug the damn thing in and you've got only 30 minutes in the morning to pour some charge into it.

But people use those damn fucking things even when they go to bed, making that 3A torture a fucking standard process!! And then they complain that their batteries go to shit?!

Hopefully this now made you realize that the fast charger shouldn't be used as a regular charger ^^

A story about the shittiest boss I ever had.

We were a consulting company, I was leading the dev team. We're on the phone with a client who needs a change to the software we're maintaining for them.

Boss (mouthes at me): How long?
I (hold up 3 fingers, mouth back): 3 days
Boss (to client): You have it by tomorrow. *hangs up*
I: What the actual fuck?
Boss: You said 3 days, 3 times 8h is 24h, better order some pizza and Red Bulls for your guys.

He pulled stunts like this all the time and yet genuinely seemed surprised when I quit.

Root has standup.

Root: I had no ticket yesterday morning, so I followed up on <TicketA> with <PersonA> and updated it in Jira and linked its related tickets; talked with <PersonB> about <TicketB>, and reviewed code review comments on <TicketC>, and thought about those while looking into the CI spec failure on <TicketD>. I collapsed for 3 hours before fixing it. Halfway through the collapse, I talked with <PersonC> on <TicketC> CR comments and the spec issue in <TicketD>, then went to lay down again. Afterward, I solved the spec issue in <TicketD>, and started on the new ticket <TicketE> before calling it a day. Plans today are to <…>.

Manager, in private: I need you to proactively let me know if you’re taking long breaks and aren’t working as this impacts business flow.

—————

Yeah.

My update was four times longer than the others’ despite her not giving me a ticket to work on. I responded to slack while I was collapsed on the floor and discussed tickets. And, after I recovered, I went back to work to finish my 8h shift. But this isn’t good enough? And I need to let her know in advance when I’m going to collapse and be a bloody mental zombie for hours? It would be amazing if I knew. I barely have a few minutes notice, and that’s only if I’m really paying attention and looking for signs.

And (conjecture) she probably still thinks I’m not performing well enough. “Affecting our business flow” probably means she’s angry I didn’t talk to other people about low-priority <TicketE> yesterday while I was laying on the damned floor.

Goddamn I hate her.

Can some drone operator please end my suffering existence?
I just got on a bus from Berlin to Munich (8h trip) and apperantly some fuckwits thought it was a great idea to destroy the GOD DAMN FREE WIFI. ONLY DRUNK ASSHATS COULD BE SO STUPID. I need a podcast to sleep well but since I already used up my mobile data volume, I'm stuck in here, surrounded by idiots and lost to the world.

Not for too long, really. Around 12-13h in the office and next 4-5h for my personal project. For a week. Then I stopped crunching and went back to 7-8h in the office and 6-7h of personal project.