[4000mAh] Galaxy Note 3 Battery,(2023 New Upgraded) Battery Replacement for Samsung Note 3 EB-B800BE N9000, N9005, N900A, N900V, N900P, N900T

A little background info to validate what I'm about to say here.I've had the same pair of Samsung Galaxy Note 3's for almost 10 years now. They still do what I want, so there's not been any need to "Upgrade". During this time, I've had a few genuine Samsung batteries, and a fair few different brands of aftermarket batteries. A couple years ago I updated the ROM on one of these phones to a release of LineageOS, so they're not both running the same version of Android. On top of that, I've a "Techie geek" who worked in IT for 20+ years, and have several hobbies that involve an in depth knowledge of lithium polymer cells.......OK. So, when I say "THIS BATTERY IS JUNK" you know that I'm not just some moron who doesn't know what they're talking about.After a couple days of use it became obvious that this was nowhere near the advertised 4000mAh, so, for thoroughness, I then switched it into my other phone to see if the problem followed the battery. It did. The battery also get's pretty warm in use, and while charging (Never a good sign).Out of curiosity I then popped the cell out of the phone and tested it bare on one, and then on a second of the data logging chargers I've got here. The weird thing is that even while charging/discharging this cell at a safe, but pathetically low 300mAh, the results were very random. Each charge/discharge cycle was taking over 24 hours (Just about understandable at such a low C rating), but the output capacity kept changing. In one test it was showing almost 3000mAh, but in most it was under 2400mAh (And in one it was just under 2000 !). The cell also seemed to be getting unusually warm during these tests.The charging tests were equally random. They ranged from taking near 3800mA for that charger to say it was full, all the way up to over 7000mA (!?!?!) before the charger decided there must be a fault with this "4000mAh" battery and automatically ending the test. I know the conversion isn't 100% efficient, but 7A ?!?!The internal resistance also bounced all over the place on these tests too, but if the pack has some form of protection circuit in there, this wouldn't necessarily be particularly accurate anyway.My guess (And compared to everything else I've wrote, this is just a guess) this is either a cheap and very badly made 2 to 3000mAh cell that's been spuriously labelled as a 4000mAh battery, it could be a cheap but genuine 4000mAh cell that's seriously degraded by age and poor storage, or it could just be a factory faulty cell. But TBH, I've found out everything I wanted to know about it now, and whatever the reason is for this particular battery being junk, I don't want it in the house any longer. I've had a handful of li-po batteries go into thermal runaway on me over the years, and even small capacity cells can "Go off" like a firework, so keeping a KNOWN bad battery in the house feels stupid to me. It's not safe to post it back anywhere, and I don't feel it's worth the risk to drop it in the battery recycling bin at the local supermarket, so it'll be getting thrown in the garden incinerator at some time in the next week, and I'll have to look for another replacement battery for the aged one that this was meant to replace. :(