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Why my battery and wi-fi don't work properly?

Hi guys!I have problems with this two components.Let's start with the battery:

a)I have replaced my battery.After replacement i saw that the new battery was draining very fast in standby(about 10% per hour).It keeps me about 12-13 hours and in this interval i just use the phone about 1 hour(calls,messages,wi-fi,etc)I have recalibrated the battery,factory reset,anything and didn't work.My adapter is an A1300 model.Even if i charge my phone from the laptop it keeps me all 12-13 hours.

The question is what is it?Is it the battery,the adapter or the U2 IC?

b)My iphone's wireless signal is very weak.I need to stay with my device near the wireless router to have strong signal.And if i do go away 4-5 metters i lost the connection.Again,reset(networks+all setings) didn't solve the problem.

Question no.2:is it from the wireless anntena or from motherboard?

Please,give my good answers.I found an original battery and wireless antenna to buy.But i need to be sure if these are the problems.Thank you!

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A) Chances are you could of gotten a bad battery. Where did you get it from?

B) Wireless signal issue is probably the Wi-Fi antenna not plugged in properly.

The chances of this is kind of low as the Wi-Fi antenna is connected to the upper left part of the logic board.

The antenna plug is actually under the logic board facing upside down to the metal housing frame of the iPhone 5. I think it hasn't gone loose if you didn't take out the logic board at all.

It's always worth a try reseating connections.

If the battery lasts you about 12-13 hours. I guess this is normal if you use Facebook / Messenger / Skype and other social apps like that. But if the previous battery performed better than the one you have now then the battery is most likely bad.

Edit: If the battery only lasts you 1 hour during use then it is a faulty battery.

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A) I will try what you said about the antenna

B) And about the battery,you have understood wrong.I keeps me 12-13 in standby mode,just with maximum 1 hour of utililsation.I have bought the battery from a local site in my country,but it seems to be not original.I will search a battery from a damaged iphone(broken screen,icloud,etc).

Thank you for your answers!

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If the battery only lasts you 1 hour during use then it is a faulty battery.

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