Accubattery app has basically the same thing, which is vibrating once phone is charged to say 80%. You can set it to whatever value you want. I have been trying that app for a while and yes initially it does bother you and kinda panic a bit, when you have overall less battery life and aren't at home. With 100% charges my A50 was very close to being a two day phone. But after capping battery to 90% charge, it's just not the same and I'm not willing to test if it lasts 2 days. I once got into less than 20% charge and wasn't at home, not fun. Before trying app, I almost never used fast charging and even if I did, A50 only has 15W charger, so it's not like it really had much of those capabilities anyway. With basic charging mode it still reached 10 watts. I have decided to use 5 watt charger to see what happens and surprisingly nothing much. It becomes somewhat longer procedure, but I don't really care about that enough. I even tried 2.75 watt charger, but that was just way too low and clearly bothersome, so I don't do that again. And to be fair, according to app, there isn't much temperature delta between 10 watts and 5 watts. It's still above 30C, perhaps 34C instead of 32C. Meanwhile putting phone in pocket can raise temperature by 4C and opening window at night and leaving charging phone there, can reduce temp by 8C. So I'm not sure if there's any merit by going that low. Perhaps at that point amperage may do more bad than temperature, but I haven't found anywhere if amperage itself, without negative temperature effects, can harm battery. Most people online only mention temperature and talk about ridiculous fast chargers. And yet we all used Nokia bricks before and their batteries still degraded after years. My Note 3 Neo had some battery degradation too after 5 years of daily use, but when I replaced battery, I saw no real difference between old one and new one. In terms of usage stats, it seemingly performed basically the same, but psychologically it felt off. I once switched back to it after using A50 and it felt liek it had poor battery, meanwhile on screen time difference between them two is just a bit bellow 2 hours. It seems that psychological perception of degradation and actual degradation are really off, not to mention ever growing psychological demand for longer lasting batteries and then completely making that feel not like improvement, but like new normal. So yeah, you can't really fight against your mind, but I'm still not sure if all this effort to preserve battery health is worth it and if it really works. BTW my 3 year old A50 according to that app still has 90% battery health, meaning that degradation rate is really damn slow and to meet technical definition of being underspec, it will need 3 more years to reach 80%. At that point phone will be 6 years old and I will be more likely to see more degradation of AMOLED screen and of screen's glass wear from all scrolling.
Now if you go to insert the sd card in another phone it would I think to format it I'm assuming
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