Found my answer at

http://home.tekies.net/HowTo/UPS%20Upgrade.htm

Here is the article off APC's Web site.

Smart-UPS XL models are not designed with communication modules to the
external
battery packs. It is important to follow these instructions. The number of
batteries effects the runtime calculations which a Smart-UPS performs when
it
is running on battery power.

There are three ways program the Smart-UPS XL to recognize the appropriate
number of external batteries.

1. Using Hyperterminal or Terminal Program to change the number of
external battery packs

Hyperterminal:
HyperTerminal is used for Windows 95, Windows 98, Windows NT 4.0, Windows
2000, Windows XP, and Windows 2003

To adjust the number of battery packs via a Hyperterminal session:
1. First, EXIT out of the PowerChute plus Server. In the case of Windows NT,
the UPS service must be stopped.
2. From the Desktop, go to: Start |Programs | Accessories | HyperTerminal.
Double-click on the HyperTerminal icon.
3. You will next be asked to choose a name and select an icon. Give it any
name and then click OK. If a message appears which reads "...must install a
modem," disregard it and continue.
4. The port settings are 2400 baud, 8 data bits, 1 stop bit, no parity, flow
control is Xon/Xoff.
5. Click on Advanced and ensure the box labeled FIFO buffer is NOT checked.
6. Click OK twice.

**Please note that if you have the scroll lock on, Hyper-Terminal may not
communicate properly with an APC UPS or
accessory.

Once the terminal/hyperterminal window is open, follow these steps:
a. Type "Shift-Y"which should produce an 'SM'
b. Type "" To see the number of external packs. (A new unit will display
'000.')
c. Type "+" Adds a battery pack
d. Type "" To see the change in number of external battery packs
e. Type "-" Subtracts a battery pack
f. Type "" To see the change in number of external battery packs


"Michael Kennedy" wrote in message
...
I recently got a SmartUPS 1400 and it had 2 12v 18ah batteries in series.
One had ruptured and the other still works but is not to full capicity. I
replaced them with 2 12v lawnmower batteries to see how long it would run.
It only has a runtime of 10 mins at 30% load.. ???!! I believe it is
oveheating or is shutting down on a timer, because when you plug it back in
it says the batteies are 95% charged. Has anybody ran into this before?
It's not draining the batteries much at all..

- Mike