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Modello versione metà 2009 A1278 - EMC2326 / processore Core 2 Duo 2,26 o 2,53 GHz

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PRAM battery, can I replace it myself?

I have an A1278 that is exhibiting all the signs of a dead PRAM Battery. I have read that this means replacing the Logic board ! Given that the life of this battery is said to be around 3 to 4 years this seems to be downright sabotage by Apple inc. Is there any way to check the condition of the battery. Is it possible to obtain one and "do it yourself".

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Colin Prutton, what are the last three digits of your serial number? This will help to properly identify your computer. Also, check these answers, pram battery MacBook mb991 It is entirely possible that your computer does not even have a PRAM battery. On those, there is a portion of the battery that is supposed to act in a similar fashion.


Thanks for the reply.

Actually the last 4 are 266E with the E.

I´ve been all over the web trying to determine if this model has either

A) A PRAM battery

B) A Capacitor

C) The Main battery keeps the PRAM alive.

Depends who you ask it seems.

Today I re-installed the original battery and it still registers 52% capacity. I was able to start without power supply or internet connection. The clock was OK.

Did a full power cycle, still OK.

Re-installed new battery, everything OK

Power cycled this battery then left Computer off for several hours with everything disconnected. Started OK, clock good.

The machine appears to be fine but I will know more after leaving it overnight without Power supply.


Colin Prutton, does this look about right :"MacBook Pro "Core 2 Duo" 2.53 13" (SD/FW) 2.53 GHz Core 2 Duo (P8700)

Intro Date: June 8, 2009 Disc Date: April 13, 2010

Order No: MB991LL/A Model No: A1278 (EMC 2326*)

Subfamily: Mid-2009 13" Model ID: MacBookPro5,5

Std RAM: 4 GB Std VRAM: 256 MB

Std Storage: 250 GB (5400 RPM) Std Optical: 8X DL "SuperDrive"


Just checked the manual and it appears as if your MBP does not have a PRAM battery.


Yep, already worked that out myself. After re-installing the old battery then re-installing the new with several SMC resets in between every thing appears to be working normally now. I guess the capacitor that supports PRAM just didn´t get filled properly. Thanks a lot for the help.


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The PRAM battery has been eliminated since unibody model introduced. As a result it will be reset and you will lose your computer current date and time once you disconnect the main battery from your computer which automatically resets the PRAM to defaults. So there is no PRAM BATTERY.

Secondly, if you want to make sure if the battery is causing problem, simply reset the SMC by this procedure:

  • Shut down the computer.
  • Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  • On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  • Release all the keys and the power button at the same time.
  • Press the power button to turn on the computer.

When you reset the SMC, the LED on the MagSafe power adapter may change states from orange to green or temporarily turn off. It gonna return to normal in about 5 seconds or less.

Hope it helps and if it did, please rate it. Thanks.

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Yes, I lost count of how many times I did this.


So let me see if I have this correct;

I haven't had a second to check model number etc. however yesterday I experienced, for the first time the date/time reset. My first inclination was CMOS battery. Off-hand I am fairly certain I bought the Mb Pro in 2009/2010. Reading this thread, sounds like if the issue continues and the model matches (what codes), I should just get a new battery for the computer, since that takes the place of the CMOS battery?


@dzb Did you resolve this? I'm experiencing a similar issue with my 2011 17" MBP and am wondering if a new battery will solve the problem. Thanks!


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