Battery draining in Iphone 4s

Recently this IPhone 4s,  running on IOS 9.3.5,  is  shedding Battery power rapidly ( full charge lasts four hours maximum). Is there anything in Settings which might tell me why?  Is it the hardware or the software?

I inserted a new battery about two months ago (before this problem arose) and it worked properly.  However it is an old phone and the cover screws are missing. Recently the phone lost all power and  went dead. I reset the Battery connections, and it worked, but the drain on  battery power recurred.  I then got a new battery and inserted it. However this made no difference to the problem.

I have checked various instructions for preserving battery life and followed them, but it makes no real difference.  Wondering what might be the cause?
Michael MurphyAsked:
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Tom CieslikIT EngineerCommented:
Try close all applications and check draining time.
If this will tell you that battery is draining fast it's going to point to battery condition
Michael MurphyAuthor Commented:
The battery is brand new.  The previous battery was also relatively new. Don't think it is the battery.

Have now discovered that the phone will not switch off. When I press the button and 'slide across to power off' the phone shuts down but within seconds starts up again.  

I checked internet for this issue. It seems that this is a fairly common problem and refusal to shut down goes side by side with battery drainage. The problem seems to be with the docking unit. Solutions suggested (and which do apparently work) are cleaning the docking unit with toothbrush or compressed air, or (more frequently) replacing the docking unit.
JohnBusiness Consultant (Owner)Commented:
I had an iPhone 4s (2 of them) and I am very familiar with the problem.

Turn off email checking and fetch manually (hourly checks if you must let the phone check).
Turn off iCloud and check manually.
Turn most updates and location checking off.

I did the above and the phone would last most of a day. Still 4 to 6 hours is about all you get.

I upgraded to an iPhone SE (2 of them). This is a 6s in a 5 case. So it has a big battery and lasts all day.
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Kyle SantosSoftware Test Analyst ICommented:
Go to Settings
Battery Usage > Toggle Last 7 days

What is being used the most?  Home and lock screen?  Mail?
Michael MurphyAuthor Commented:
Done all that John. Made no real difference. See my post about inability to switch off . That seems to be important.  i cannot close down the phone. When I close it, it immediately restarts . The only circumstance where it closes properly is when the phone is connected to the power supply.(is charging)
JohnBusiness Consultant (Owner)Commented:
Remove the charging cable (cannot have it connected), hold down the top power button until you see the power off icon. Swipe it off. Now it will go off.

Also, 4 hours for an iPhone 4s is not that bad for an older phone.
Shaun VermaakTechnical SpecialistCommented:
Please post battery information as per Kyle's post in ID42044530
Eoin OSullivanConsultantCommented:

I think you might be looking at HARDWARE issues here and not iOS factors.

 You're running an old version of iOS on an old phone and neither have changed in a long time so I'm sure all your notification settings etc are optimised so you can probably ignore all those suggestions as factors.  If the battery lasted 6-8 hours before with all the same settings and now a NEW battery lasts a lot less then it points to hardware problems.

You say you've replaced the battery three times in this iPhone .. and the second battery had a sudden drain issue and the most recent battery is doing the same thing.
"Recently the phone lost all power and  went dead. I reset the Battery connections, and it worked, but the drain on battery power recurred.  I then got a new battery and inserted it. However this made no difference to the problem."

To my mind either of the possible scenarios could be the issue ..
1. The NEW battery you got was possibly NOT NEW (did you buy it from a reliable source?) even genuine new batteries can have a small number of faulty units so you MIGHT want to try returning it or having it tested externally from the phone.
2. More likely is that with all the opening and replacing the battery on this phone you may have some damaged connections on the phone to the battery which in effect drain the battery and might also explain why it won't power off fully.  Might be time to send it to Apple or an a place that has the proper hardware diagnostics as the phone itself DOES NOT have this type of diagnostics built-in.

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Michael MurphyAuthor Commented:
Thanks for that
Michael MurphyAuthor Commented:
Have  enough to go on. Will be out of contact for next 3 months so will close this now
Charles KellyCommented:
How long does your battery last?
Kyle SantosSoftware Test Analyst ICommented:
Fwiw, buying second hand charging devices increase wear and tear on devices.  Improper voltage of charger cable or outlet can contribute to that degradation of battery life.  Try to always use Apple charging devices but if you're cutting costs make sure to buy the right type of generic charging cable.  Take care.
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