HowToFixComputers.com

jag · Guest

Hi

My 9100 loses time. Does it have 3 batteries??

I have monitored the 6 cell 'bridge' battery and it seems ok, I have
removed this battery as well as the main 14,8 v battery with the AC
disconnected and it did not lose any time in 36 hours.

If there is another battery can you lead me to it. I had the keyboard
off and two boards under it out. The next step, removing the board with
the Trident chip, looked like a lot of work.

Are there any disassembly instructions available?

Happy Holidays

jag

BillW50 · Guest

"jag" <jag@vcn.bc.ca> wrote in message
news:1167553969.374488.107080@h40g2000cwb.googlegroups.com

jag · Guest

BillW50 wrote:

jag · Guest

BillW50 wrote:

jag · Guest

Thanks Bill

This laptop is never connected to the internet so synchronizers are not
of any use.

It certainly seems battery related.. It kept perfect time with the 6
cell and the main 14.8 v packs removed and the AC off for 2 1/2 days,
however, I just booted it after being unplugged from AC for less than 2
days and it is 21 hours slow.

????

BillW50 · Guest

"jag" <jag@vcn.bc.ca> wrote in message
news:1167678709.189378.94320@s34g2000cwa.googlegroups.com

jag · Guest

Bill - Thanks again. I'm glad somebody else is a bit confused :)

This laptop when used is powered by AC (an inverter 12vdc-120vac). At
times there can be a couple of weeks between uses. When not in use
there is no AC. The date and time is an integral part of the use of the
computer.

I had enough of the machine apart so that I believe I would have seen
anything bigger than a disc type battery. I guess there are
re-chargeable disc batteries.

It certainly acts like the clock is powered by a re-chargeable battery.
I could believe if I replaced the main 14.8 v battery my problem would
go away. It does not hold a charge well and dies unexpectedly. It can
read 60% and die a minute later, on re-boot it is at 0% charge.
However, in use I have no need for that battery

I was really surprised to see the correct time and date when I
re-assembled the laptop when the 7.2v, 14.8v and AC were off for 2 1/2
days. Then after sitting with the 14.8 battery low,the clock had
stopped - but not reset.

I had hoped somebody could tell me if there is a third battery. It
seems like a really well kept secret.

Perhaps I should see if I can get the "Adjust Date /Time" window to
come up on boot up to remind me to confirm or set it.

IBillW50 wrote:

jag · Guest

I have found the 3rd battery on the underside of the mothrboard. It is
a coin cell marked Panasonic ??AN UL 1220. It measures 2 volts. It is
soldered to the motherboard via tabs which are spot welded to it.

I can't find any references to a UL 1220 just a CR 1220.

I suppose the best method or replacement is to cut the tabs and solder
the new battery to the cut off tabs ???

John

jag · Guest

I found one reference to a used UL1220 for sale on ebay from a DELL
5000:

< http://tinyurl.com/yf3roe >

and now I know there are 3 characters in front on the "AN" they are
"JAP".

With a little imagination you can probable make out the UL1220.

An other question comes to mind - Is this battery re-chargeable? I
don't think one would want to put in a non-rechargeable when if should
be a rechargeable.

John

Lon · Guest

jag proclaimed:

BillW50 · Guest

"jag" <jag@vcn.bc.ca> wrote in message
news:1168202474.139443.86640@q40g2000cwq.googlegroups.com

jag · Guest

jag · Guest

Aha !

I found it it is a VL not a UL 1220

John

jag · Guest

I done it !!

I got it all apart, I couln't believe how much there was to take apart
and how many screws there were. It took me a couple of weeks to get a
new battery, I'm north of the 49th latitude and found one place in
Canada that had them, $36.00 delivered. I got it from DigiKey, $US
4.50, $21.25 by the time $8.00 shipping & $6.50 under $32. order fee
added in.

The battery is mounted parallel to the MB facing the bottom of the
case. The positve tab is soldered top and bottom, it looked like it
would be real tough soldering the top end so I clipped it at the
battery to allow it to be popped out when the negative was unsoldered.
The solder pad is about the size of the head of a pin. Can't get at
the neg to clip. It would have been easier if I had clipped the new pos
tab but I didn't want to disfigure my $22.00 battery so I bent the tab
in, soldered it in place with the neg, soldered the pos tabs. Luckily I
peered under the battery and unfortunately noted the bent tab appeared
to be touching components on the MB. I unsoldered the pos and gingerly
coaxed the tab to the outside and then resoldered.

There is a tin shield between the bottom of the MB and the inside of
the case. It has a small dent (not OEM) at the site of the battery,
indicating the Pos of the battery had been touching it, the shield is
neg - this may have been the real problem. I put two layers of black
tape on the shield.

All back together, only one screw left over, and one pushbutton for the
modem release broken - and it still boots up. Presumably it will keep
time now.