In response to a post a couple of months ago which was
never resolved:-

Errors 161, 192, 163.
All three of these errors are connected to the back up
battery.
To resolve this problem:
1. open memory flap on base of laptop (small philips
screwdriver required)
2. find the small connector with 1 black & 1 red wire
coming from it.
3. disconnect above connector and gently pull the
Red&black wires. The backup battery should just pull out
from under the casing.
4. get replacement battery. Either
a. call IBM spares (07900 247 490 in UK) and ask for FRU:
02K6502. UK price is about £8 + £15 delivery + VAT.
b. if comfortable with soldering iron: Carefully open the
packaging on the backup battery using a sharp knife.
Remove the solder tags from the battery (these are spot
welded so need to be cut/broken off). Buy a new CR2025
battery from any computer shop, jeweler, or camera shop.
Using electrical tape, insulate all round edge of battery
(see the one just removed). Solder the leads onto the new
battery - note polarity. Red wire to +, black wire to -.
Using more insulating tape, wrap battery so that all
exposed metal is covered.
5. put new battery into laptop (reverse steps 1-3)
6. start up computer, error 192 has gone, but still shows
161, 163. Select OK.
7. reset date & time, and OK
8. when screen shows 'O / I' restart laptop using on/off
switch at side.  

i've replaced the battery,

error 192 is gone

162 & 163 still appears but after hitting ok - it doesn't give me an option to reset date & time?

i have the same problem. i have reset the date and time. and pressed ok. but error 163 still comes up. and it goes on and on.. what should i do.

I also this problem. After power on Thinkpad 380Z 2635 gives errors 161 & 163. It doesnt allow me to set date and time. As far as I see from other posts on internet, it is a Bug of ThinkPad. The IBM officials should find a good solution to this problem.

Congratulations and thanks I work but now it requests a key and leave errors 161 and 163 thanks for the aid