jdebert wrote:
On Sat, 25 Oct 2014 03:22:24 -0400 Central Scrutinizer
wrote: 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 ?
Mine has recently died (the battery, not the UPS) and replacing it with a car battery is exeactly my intent.
They are BOTH lead-(sulphuric) acid chemistry, so are essentially interchangeable, except that the car battery has a greater capacity in Amp-hours, and also has higher peak charge and discharge rates.
Lead-calcium batteries tolerate a max design charge rate of 35amps without damage. the damage increases proportionally with the charge rate and is cumulative. This is why a battery fails quickly after being jumped just a few times. Such a battery will self-discharge rapidly or stop holding a charge altogether, especially in freezing weather, and will quickly boil off from constant charging.
Starved electrolyte batteries such as the Optima brand will be permanently and severely damaged when the charge rate exceeds the design max limit of 35amps. This is why they must never be jumped even once. It will void the warranty. And who wants to buy a new Optima every month at the current price of $250US?
Optima has three lines Red Top -- Maximum Cold Cranking Amps Yellow Top -- Tolerance for cycling due to powering low-power electronics while vehicle engine is turned off. Blue Top -- Deep Cycle / Marine usage. I'm betting that the 'jumping voids your warranty" only applies to the Red Top line.
Gel electrolyte batteries generally have a much lower charge rate.
Correct -- the gel slows carrier migration, which slows down charge and discharage capacities.
Exceeding it can permanently damage the battery. The electrolyte can retain heat longer than the other two types. I do not recall what the charge rate is atm and it varies by battery vendor, type and capacity. UPS's are designed to charge specific gel batteries at specific rates.
Don't learn the hard way how not to handle or use such batteries. Read up on them, their specs and MSDS's. Know how to protect yourself in case something goes wrong. Be prepared for anything. Safety First.
Good advice.
jd
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