APC SU1400XLT User Manual download pdf (Page 51)

• Use of a third party battery may void UL, CSA, VDE, and other safety certifications (according to

APC)

If you do decide to use third party replacement batteries, please do not choose the cheapest available

generic SLA batteries. These batteries will, almost without exception, not last as long as brand name

batteries and will need replacing within 12-18 months instead of 3-5 years. Even when using brand name

replacement batteries, make sure that you choose the UPS version (aka "standby") which may cost

slightly more, but which will last significantly longer in typical UPS usage (long periods of standby

punctuated with infrequent deep discharges).

The brands of battery found in genuine APC battery cartridges have included: Panasonic and B&B Battery

(aka Best & Best Battery and BB Battery). Yuasa (aka Genesis) is also a recommended brand, albeit a bit

on the pricey side.

Note: When substituting a third party battery with a higher capacity than the original, make sure that it still

physically fits in the UPS casing. If the battery does not fit, do not be tempted to install it "externally". The

UPS may not be able to charge it in a timely manner and/or it may damage the UPS charging circuitry

without appropriate modifications which are generally beyond an end user's capability.

Battery Installation

Although you can do a hot swap of your batteries while the computer and any other connected equipment

is running, it may not be very satisfactory because the UPS will not always detect that the batteries have

been swapped and apcupsd will continue to report "Low Battery".

There are several ways to correct this situation:

1. If you have a "smart" UPS model, you can force a self-test to make the UPS notice that the battery has

been replaced.

2. If after a self-test, the UPS does not detect that the battery has been replaced, you can use apctest to

do a soft battery runtime calibration. For details of doing this, refer to the "Soft" Runtime Calibration

section below.

3. If after the soft battery runtime recalibration, the UPS does not detect that the battery has been

replaced, you will need to do a manual battery runtime calibration. For details of doing this, refer to the

"Manual" Runtime Calibration section below.

"Soft" Runtime Calibration

A runtime calibration causes the UPS to recalculate its available runtime capacity based on its current

load.

Caution: a runtime calibration will deeply discharge the UPS batteries, which can leave a UPS temporarily

unable to support its equipment if a utility power failure occurs. Frequent calibrations reduce the life of

batteries. APC recommends performing a runtime calibration only annually, semiannually, or whenever

the load on the UPS is increased.

In order to perform a "soft" runtime calibration it is necessary to wait for the UPS to recharge its batteries

to 100% capacity. Once this has been done, you can then initiate a runtime calibration through apctest.

APC Documentation Notes:

1. In order for the calibration to be accurate, the output load has to be more than 40% (some APC

documentation recommends at least 30%). Also, it is advisable not to increase or reduce the load when

the UPS is calibrating its run time.

2. Under no circumstances should the UPS be turned off during a run time calibration procedure! Once

initiated, the calibration must be allowed to run until completion.

3. The run time calibration procedure is not necessary nor advisable for a new UPS. Only old UPSes with

batteries that are not subject to discharge for long periods of time should be allowed to perform a run time

calibration.

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APC SU1400XLT User Manual Page 51

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