On 07/03/13 18:26, Martin N wrote:
> Lo,
>
> At 17:57 07/03/2013, you wrote:
>> On Thursday 07 Mar 2013 15:24:55 Martin N wrote:
>> > After an hours charge i get 4.8V but that could be corrosion on
>> connectors
>> > or my cheapo multimeter.
>> >
>> > So if the UPS dead?
>> > battery dead?
>> >
>> > How long does the lead acid battery last in storage?
>> >
>> > Any advice on how i can test things further?
>> >
>> > thanks for your time
>> >
>> > Martin N
>>
>>
>> Martin,
>>
>> I have aquired a Belkin unit with very identical symptoms.
>
> Urgh this APC is to replace an old belkin 800VA unit that was badly
> designed.
> You had to bend open a metal cage to insert a replacement battery.
> Did it once and swore when the second battery went i would just get a
> new UPS.
>
>> In my case one
>> battery terminal had actually corroded and fallen off, so it was a
>> pretty
>> simple fault to find. Typically, the Lead acid batteries used will be
>> 6Volt or
>> 12Volt, sometimes wired in series to give 24Volts. Disconnect the
>> battery(ies)
>> and measure the voltage across them. If you are move than about two
>> volts from
>> the typical values above, it's likely that the battery is dead and needs
>> replacement.
>
> Its 4.8V but they are not getting warm like i would expect a dead
> battery to do.
> IIRC.
>
If you unplug the UPS for a few minutes, connect the multimeter across
the battery then power it up, do you see the terminal voltage rise? If
the charger is charging, I would expect to see that.
Cheers,
Paul.
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