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3000 N100 - date and time are getting reset, CMOS battery empty?

E.g. 3000, IdeaPad, S- and U-Series, B-Series and so on...
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BigCatAndy
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3000 N100 - date and time are getting reset, CMOS battery empty?

#1 Post by BigCatAndy » Fri May 17, 2019 3:10 pm

Hello,
recently I bought one Lenovo 3000 N100 (without a battery), and have following issue with it: when it remains longer disconnected from the power supply, it doesn't start at first button press. At the second one it starts, but says "Time and date are not set, CMOS checksum is bad". When I go to BIOS, it says "01/01/2015". I suppose, the BIOS battery is empty. Is it possible to replace CMOS battery (like in thinkpads)?

regards,
Andrey
- in use -
(1) Lenovo TP R61i Frankepad - 4 GB / Core2Duo T8100 / 180 GB SSD / UXGA display
(2) Lenovo TP Z61t - 3 GB / T2500 2,00 GHz / 160 GB, 7200 RPM
(3) Lenovo TP X200s
- in museum -
IBM 600x / 450 MHz / 320 MB RAM / 20 GB HDD - still alive and running! :-)
IBM TP T43p

axur-delmeria
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Joined: Mon May 28, 2012 5:49 am
Location: Metro Manila, Philippines

Re: 3000 N100 - date and time are getting reset, CMOS battery empty?

#2 Post by axur-delmeria » Sat May 18, 2019 2:14 am

Took a quick look at the N100 HMM https://download.lenovo.com/ibmdl/pub/p ... 553_03.pdf but I can't seem to find a replaceable CMOS battery. It's possible that the CMOS battery is a rechargeable one that's soldered to the system board.

Confusingly, the Symptom-to-FRU Index mentions:
0270
Real time clock error

1. Charge the backup battery for more
than 8 hours by connecting the ac
adapter.
2. Replace the backup battery and run BIOS
Setup Utility to reset the time and date.
#1 proves that there's a rechargeable backup battery, but #2 implies a removable battery but is never mentioned in the disassembly section. :roll:

It's likely that the main battery is needed to keep charging the backup one in order to keep the date and time. :x
Daily driver: X220 4291-C91 i7-2620M

Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
:cry:

BigCatAndy
Sophomore Member
Posts: 228
Joined: Wed Feb 02, 2005 4:37 am
Location: Hamburg / Germany
Contact:

Re: 3000 N100 - date and time are getting reset, CMOS battery empty?

#3 Post by BigCatAndy » Sat May 18, 2019 9:50 am

axur-delmeria wrote:
Sat May 18, 2019 2:14 am
Took a quick look at the N100 HMM https://download.lenovo.com/ibmdl/pub/p ... 553_03.pdf but I can't seem to find a replaceable CMOS battery. It's possible that the CMOS battery is a rechargeable one that's soldered to the system board.

Confusingly, the Symptom-to-FRU Index mentions:
0270
Real time clock error

1. Charge the backup battery for more
than 8 hours by connecting the ac
adapter.
2. Replace the backup battery and run BIOS
Setup Utility to reset the time and date.
#1 proves that there's a rechargeable backup battery, but #2 implies a removable battery but is never mentioned in the disassembly section. :roll:

It's likely that the main battery is needed to keep charging the backup one in order to keep the date and time. :x
Thanks you very much for the hint. I found on the Internet, the type of battery - fixed or replaceable - depends on the type of the laptop.
Going to put the laptop on the power over the night.
Regards,
Andrey
- in use -
(1) Lenovo TP R61i Frankepad - 4 GB / Core2Duo T8100 / 180 GB SSD / UXGA display
(2) Lenovo TP Z61t - 3 GB / T2500 2,00 GHz / 160 GB, 7200 RPM
(3) Lenovo TP X200s
- in museum -
IBM 600x / 450 MHz / 320 MB RAM / 20 GB HDD - still alive and running! :-)
IBM TP T43p

BigCatAndy
Sophomore Member
Posts: 228
Joined: Wed Feb 02, 2005 4:37 am
Location: Hamburg / Germany
Contact:

Re: 3000 N100 - date and time are getting reset, CMOS battery empty?

#4 Post by BigCatAndy » Sun Jun 02, 2019 1:07 pm

BigCatAndy wrote:
Sat May 18, 2019 9:50 am
Thanks you very much for the hint. I found on the Internet, the type of battery - fixed or replaceable - depends on the type of the laptop.
Going to put the laptop on the power over the night.
Regards,
Andrey
Update: CMOS battery keeps the date and time after keeping my laptop on the AC power for 8-10 hours.

Cheers,
Andrey
- in use -
(1) Lenovo TP R61i Frankepad - 4 GB / Core2Duo T8100 / 180 GB SSD / UXGA display
(2) Lenovo TP Z61t - 3 GB / T2500 2,00 GHz / 160 GB, 7200 RPM
(3) Lenovo TP X200s
- in museum -
IBM 600x / 450 MHz / 320 MB RAM / 20 GB HDD - still alive and running! :-)
IBM TP T43p

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