Carlos E. R. wrote:
On 2014-10-24 12:38, ellanios82 wrote:
Hello List,
- recently my UPS 12 volt battery has given-up the ghost and died.
Due location it is not easy to get exact correct replacement UPS Battery.
- could someone be so kind to advise :
is it safely possible to replace dead battery with a 12 volt jelly Car Battery ?
Good question.
With traditional lead-acid batteries, there were some important differences between car batteries and static batteries. Car batteries are subject to vibration, which can be bad, breaking things, but also good, in that the vibration caused the bubbles to go up easily (bubbles in the plates act as insulator, reducing capacity and current flow). Static batteries compensated by separating the plates so that bubbles floated easily up. Car batteries could be way more compact, less free liquid.
With modern jelly batteries, this does not happen. There are no "bubbles". So I'm unsure what is the difference now between car and static models.
I think you could use any static model of similar "Amps * hour" rating. Similar as in "same or more", not less. How much more, I'm unsure. Obviously, bigger capacity means that they take longer to charge, longer to discharge, and suffer less damage on discharge because it is not so "brutal" for them, being bigger.
On the other hand, the electronics might not cope right. Guessing here for possibilities. The battery can discharge for a longer time, so that the electronics may be running an active load for longer, perhaps overheating. The electronics might guess wrong at the charge/discharge cycles and capacity, and compensate wrongly. Charging will take longer, maybe the electronics thinks that it is not charging because it does not see the voltage rise and think the battery is damaged.
Most of that is wild guessing on my part... we need someone with current internal knowledge to say. Maybe it depends on design parameters. Maybe nothing (bad) happens!
Well, really, you have to tear open the UPS and see how that particular UPS was designed and how it operates. I wouldn't even count on two UPS from the same manufacturer to operate the same internally if they don't have IDENTICAL model numbers. Open it up. Turn it on, and with the battery removed, use a volt-meter to measure the "open voltage" across the battery leads -- this will tell you what voltage the controller is attempting to maintain the battery at. If you want to change it... typically adding resistance onto a lead (preferably the "hot" lead, not the ground lead) will lower the "open" voltage, and reducing resistance on that lead will raise the "open" voltage. Increasing resistance ALSO reduces charge/discharge rates and increases charging time.
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