1850mAh and higher battery extender - General Accessories

I made my very own battery extender. 1850mAh for now, soon 2000mAh and later, 2500mAh. You can find the information on my website at http://www.powercx.com/xda-ii
So far, I can use this on a lot of devices under 5.5v. This only produces 4.8v, so no regulator is needed. You can use any 4 AA battery, preferably rechargeable battery since they have higher amp.
I was able to get 7.5 hours of continuous usage listening to my MP3 on my network using WiFi to download the music on full brightness. This test includes the extender fully charged and once it's finished, it drained my internal battery. 7.5 hours is only 30% left. Without the internal battery, it last 6 hours on the battery extender alone.

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3500 mah battery question.

Just bought a 3500 mah battery. I heard if charged with the evo it will only charge it to 1500 mah. Is that true? If so do I have to charge out externally or is there another way?
Sent from my htc evo 4g. ALL HAIL EVO 3D!!!
No, not true at all. At first, yes, because it's used to the 1500 mAh stock battery, but it will start being fully used after a few charging cycles. Just give it time, and it'll be fine.
You don't need anything extra.
You can also wipe battery stats to make the process a little quicker.
I can verify what JustRuin wrote - I actually gathered data from Current Widget and Bat Stat, and compiled them into a spreadsheet (hey, I was bored at work, and it beats calling customers). What I found is that the phone will display that it's full in terms of percentage, once it's charged to what would be 1500 mAh based on the percentage it's showing when you start charging. For example, if you're showing 33 %, that would be 500 mAh out of 1,500 mAh for the stock charger. If you then charge it at a net charging current of, say, 1,000 mA, the light will turn green and the phone will show 100% in about an hour. but the voltage will still be down around 3.9v, and the net charging current will continue at the same level until the voltage reaches around 4.2 volts. On the stock battery, the charging current will start dropping after you reach 60%, and by the time you're around 90%, it will barely be charging at all. On the 3500 mAh battery, charging current stays consistent until you're around 4.15 -4.2v. If you simply leave it on the charger for a couple hours longer, you'll have a full charge and no problems with battery life.
hercules rockefeller said:
I can verify what JustRuin wrote - I actually gathered data from Current Widget and Bat Stat, and compiled them into a spreadsheet (hey, I was bored at work, and it beats calling customers). What I found is that the phone will display that it's full in terms of percentage, once it's charged to what would be 1500 mAh based on the percentage it's showing when you start charging. For example, if you're showing 33 %, that would be 500 mAh out of 1,500 mAh for the stock charger. If you then charge it at a net charging current of, say, 1,000 mA, the light will turn green and the phone will show 100% in about an hour. but the voltage will still be down around 3.9v, and the net charging current will continue at the same level until the voltage reaches around 4.2 volts. On the stock battery, the charging current will start dropping after you reach 60%, and by the time you're around 90%, it will barely be charging at all. On the 3500 mAh battery, charging current stays consistent until you're around 4.15 -4.2v. If you simply leave it on the charger for a couple hours longer, you'll have a full charge and no problems with battery life.
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so what your saying is that even tho the light is green, the phone will still be charging?
Yep, it's definitely charging.
This is why i dont use sbc. I went a whole day without charging. From 7:30am to just about 15 mins a.go and i still had 50 percent left on my battery. simply just unplugging it and plugging it back in before i take my shower in the morning and i stay at 100% for about 2 hours.

Battery charging apps for LiIon battery life

The maximal battery life for LiIon can be accomplished like they do with Hybrid/Electric cars. If you cycle from 80% to 40% you will get 10x the battery life (equivalent total Ah used) compared to charge and discharge from 100% to 10%. In fact, leaving a LiIon battery around the 100% to 90% range or under 10% permanently reduces capacity (it's chemistry)
If you have root, is there a script or app to stop charging at 80%? I suppose the batteries are not quite laptop expensive, so I guess for $30 you can just buy a new battery when you go through the 500 full cycles.

Battery messed up?

So I have a zerolemon 10000 mah battery for my note 3, I just switched to cm11 and noticed the battery percentage meter was going wacky and wasn't being accurate (eg. It would jump up 10 percent after a reboot or last hours on 1 percent with heavy use) so I followed the instructions for fixing it, I let it drain completely and then I charged it to 100 percent while the phone was off, then I turned it on and charged it again until it showed full just like it said to do in the instructions, after this I went into my battery status app just out of curiosity, there I saw that the battery had 4250 mv , I am alarmed by this because the battery is only supposed to be 3.9 voltz, is my battery damaged? I always thought that the batteries have circuits in them to prevent overcharge then how come it overcharged my battery??
Sent from my SM-N900T using XDA Free mobile app
Actually battery voltage is a little bit tricky:
first of all it will show higher with no load than with load on it and higher the load, lower the voltage, full charge or not.
Secondly for example my original phone battery is rated 3.8v, but at full charge will be higher than 4 volts.
I don't remember how Li ion batteries are rated, but for example NiCd are rated at 1.2v, which would be the voltage the battery shows when under full load, under no load the voltage will be more than 1.5v and if that NiCd battery shows 1.2 v under no load it usually means it's close to being completely discharged. I don't have specs for your particular battery, but I'm sure fully charged with no load will show more than 4v.
Since the battery has protective circuit, it should still be within specs, before the damage occurs, so I don't think you should worry too much, however if you were doing this all the time, I'm sure you will shorten battery life.
Full charge for lipo is about 4.2V. So the battery is not overcharged. The batteries have a protective board on them, and the charge control on the phone won't allow overcharging either.

battery puzzle

Battery life under 6.0.1 seems decent enough: 10% charge remaining after 17h 52m, with the screen on for 4h 10m. The day's usage included a half hour of streaming HD video and a half hour of Skype videochat. WiFi, mobile data, Bluetooth, GPS were turned on, smartwatch connected, and social media apps were running in the background.
But I'm puzzled about the detailed battery statistics.
The screen is reported to have used 714 mAh of charge, which is reportedly 46% of the total charge used so far. Thus, the total charge so far would be 1552 mAh. And the total so far is reportedly 90% of the battery's capacity (i.e., 10% remaining).
By those numbers, the battery's total capacity is 1724 mAh. But that's only 57% of its rated capacity of 3000 mAh.
What's going on? Is the battery that worn out (despite its reasonable performance), or are the numbers being reported incorrectly?

Battery capacity calculation

So I bought myself a decent USB multimeter (RuiDeng UM25C) because I was curious about my Mi 6 battery capacity after 20 months of everyday heavy usage.
I was avoiding charging to 100% all this time (max to 70%), only charging to full once a month maybe and never using a phone during charging. I also rarely discharged to less than 30%. The full charge counter in /sys/class/power_supply/bms/cycle_count is showing 642 full accumulated charge cycles, so quite a lot.
USB meter showed 14300 mWh after a full charge 0-100% (which is 110% of the original capacity 12900 mWh, impossible). So I did a search and found an article saying that Quick Charge 3.0 has around 90% charging efficiency.
So I made a quick mathematics and calculated that the battery should have taken in 14300 mAh x 90% = 12870 mAh (the rest of energy dissipated as a heat), which is basically new battery's capacity (which is again quite improbable, even with my special battery treating ).
My question is: is this calculation wrong? And if it is totally wrong - what should I count in additionally to get the more proper mWh estimation?
Thanks for any help

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