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770x Dead CMOS = Battery Charge Problem
Posted: Thu Jul 09, 2009 8:23 pm
by ethink
The CMOS Battery expired in my oldest ThinkPad, a 770x, while stored as a reserve machine.
The CMOS replacement is a Energizer CR2025 that is generally available at WalMart. It is a lot easier to replace than the CMOS Battery on the T23.
I did notice that the 770x will NOT recharge the Li-Ion with a dead CMOS battery. This was a surprise to me.
Upon replacement of the CMOS battery, my batteries recharge successfully.
I hope this information helps somene in the future.
Re: 770x Dead CMOS = Battery Charge Problem
Posted: Thu Jul 23, 2009 1:52 am
by Robbyrobot
The CMOS replacement is a Energizer CR2025 that is generally available at WalMart. It is a lot easier to replace than the CMOS Battery on the T23.
Let's just say that the holder on the T23 is a pain
Basically, you can replace one of these CMOS batteries with a CR2025 or CR2032 fairly easily by pulling off the welded tabs with pliers and attaching them to a new battery with plastic tape - I've done this several times. Some people don't like the idea, however, and prefer new batteries. Matter of taste and perhaps security - I admit the welded tabs are safer than those simply taped onto the battery.
Re: 770x Dead CMOS = Battery Charge Problem
Posted: Fri Jul 24, 2009 8:10 pm
by sqmaster1234
Thank you very much!!!!
My first post was going to be a question about my 770z (Which I'm typing this on now
)
that wouldn't boot unless plugged into an ac adapter, and i think my CMOS battery might be dead, too! It wouldn't stay in place without a little duct tape (one of the brackets was broken)
but I still get clock errors on startup. I'll replace my CMOS battery once I get mine in my office.
Thanks Again!!
Re: 770x Dead CMOS = Battery Charge Problem
Posted: Sat Jul 25, 2009 1:31 am
by BillMorrow
770Z is a classic thinkpad..
it will hot swap the ultrabay devices if running win2000..
Re: 770x Dead CMOS = Battery Charge Problem
Posted: Sat Jul 25, 2009 9:48 pm
by sqmaster1234
Bill, were you responding to my post? Because I don't understand where that comment fits in to the discussion.. Just Wondering!
Re: 770x Dead CMOS = Battery Charge Problem
Posted: Sun Jul 26, 2009 2:55 am
by BillMorrow
i was just remarking that the 770Z was a very good thinkpad, nothing more..
i THINK i have one here, someplace..
your CMOS battery issue seems to be solved more or less..
i was not intending to hijack your thread.. sorry if it seems like it..
Re: 770x Dead CMOS = Battery Charge Problem
Posted: Sun Jul 26, 2009 12:40 pm
by sqmaster1234
Oh, No! No problem, Bill... I was just wondering if you were just commenting on the ThinkPad 770z or if you were trying to help, but you're right, it's solved... Thanks for the reply, I was just curious as to the context.
And yes, the 770z is pretty awesome:)
At a demo at Harvard, a friend was showing someone how the new ThinkPads had hotswappable devices, and got so excited, that he whipped out the Hard drive. They were all like