[Help] Phone Won't power on with "fake" battery

[MoJoMax]

Hello, I have this phone which does no have a battery.

I had another phone battery laying around

But it does not fit that phone

so i soldered some cables where the 

battery input is. So i tried to connect the battery and a wall charger to the input

i made but the phone won't power on...

If i directly connect it via the micro usb, the phone powers on and for some reason it thinks that it has 50%

battery but when android loads it says it has 100%.

Anyways i could use the phone like that but it only lasts a few seconds and then powers off..

So i checked that the cable i made does not make a short circuit but that's not the case..

Here's a picture:

 

 

 

As you can see i connected the cables correctly as in this image: 

[Helpful Tech Witch]

That battery may not have the right amperage/voltage, the phone may need higher than the battery you had.

 

Any phone should power in without a battery, if they are plugged into USB, as they will run straight off wall power.

[MoJoMax]

4 minutes ago, HelpfulTechWizard said:

That battery may not have the right amperage/voltage, the phone may need higher than the battery you had.

 

Any phone should power in without a battery, if they are plugged into USB, as they will run straight off wall power.

i tried using a Wall adapter but that did not work either only via the micro usb port

[Kilrah]

A lot of phones won't run without a battery.

This battery is LiHV, so 3.85V instead of the more common 3.7. If it's fully charged and the phone expects a 3.7V one it will likely shut itself down for protection thinking the battery is overcharged.

 

Also the temperature sensor (middle contact) may need to be connected as well to avoid a safety shutdown, hoping it's the same type as on the original battery.

[MoJoMax]

3 minutes ago, Kilrah said:

A lot of phones won't run without a battery.

This battery is LiHV, so 3.85V instead of the more common 3.7. If it's fully charged and the phone expects a 3.7V one it will likely shut itself down for protection thinking the battery is overcharged.

 

Also the temperature sensor (middle contact) may need to be connected as well to avoid a safety shutdown, hoping it's the same type as on the original battery.

Then why does not work even with using a direct voltage from a wall adapter...

[Kilrah]

Well, what does that wall adapter supply? And that won't have a temp sensor. 

[MoJoMax]

12 minutes ago, Kilrah said:

Well, what does that wall adapter supply? And that won't have a temp sensor. 

Just like a normal usb charger

[Kilrah]

So it's putting out 5V, if you're connecting that to the battery contacts that aren't supposed to see more than 4.2V it's normal the phone would refuse to work or get damaged.