[Nut-upsuser] APC UPS: replacement battery always triggers shutdown

JS jshaio at yahoo.com
Sun Nov 11 15:21:35 UTC 2012

 I've been using nut on an APC Back-UPS 750 for several years with no problem, seeing the walled "UPS on battery power"
messages during short 1-2 minute outages. This is connected with the original USB cable that came with the unit.

After replacing the battery recently, nut always triggers a shutdown when AC power is cut off, even if only for 1 minute.

I see that the data fields reported by nut have not changed (details below) and the runtime is stuck at 0, even with 35% charge. This runtime is an incorrect
reading as I verified that stopping nut and cutting off AC power does indeed keep my computer running. It is only nut that thinks the runtime is 0 and triggers
the shutdown.

FAQs #37, #38 on networkupstools.org are related to this issue:

I followed this procedure (charging the battery fully, letting it drain off a token load while UPS is grounded on a surge protector) but it did not help.

Perhaps I missed something running this procedure; if anyone has suggestions for solving this they'd be greatly appreciated.
I'm using nut-2.6.4-1 on debian linux (testing distribution, kernel 3.1.0-1).


Here are the details I see:
=> upsc apc
battery.charge: 35
battery.charge.low: 10
battery.charge.warning: 50
battery.date: 2001/09/25
battery.mfr.date: 2008/01/25                        <<<<<<<<<< battery bought 11/01/2012 ??
battery.runtime: 0                                          <<<<<<<<<< runtime = 0 with 35% charge above?
battery.runtime.low: 120
battery.type: PbAc
battery.voltage: 11.8
battery.voltage.nominal: 12.0
device.mfr: American Power Conversion
device.model: Back-UPS ES 750
device.serial: 3B0804X42777 
device.type: ups
driver.name: usbhid-ups
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 2
driver.parameter.port: auto
driver.version: 2.6.4
driver.version.data: APC HID 0.95
driver.version.internal: 0.37
input.sensitivity: medium
input.transfer.high: 139
input.transfer.low: 92
input.voltage: 119.0
input.voltage.nominal: 120
ups.beeper.status: enabled
ups.delay.shutdown: 20
ups.firmware: 841.I2 .D
ups.firmware.aux: I2 
ups.load: 42
ups.mfr: American Power Conversion
ups.mfr.date: 2008/01/25
ups.model: Back-UPS ES 750
ups.productid: 0002
ups.realpower.nominal: 450
ups.serial: 3B0804X42777 
ups.status: OL CHRG LB                            <<<<<<<<<<<<<<< see FAQ #37, 38
ups.test.result: No test initiated
ups.timer.reboot: 0
ups.timer.shutdown: -1
ups.vendorid: 051d
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