Filling lead acid battery with distilled water while charging

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Deal Cadet
mango-man

I have a 5 year old lead acid battery + inverter UPS system for my home. Once discharged, the battery charges for weeks before reaching full charge. This wasn’t the case before, issue came up only in the last two years (before that, the battery will reach full charge in a day or two of charging).

Anyways, the problem is that while charging for weeks, the water in some cells gets dried up. In that case, I’m confused about what to do. I’ve read that water must be added only after the battery is fully charged. But if I wait till the battery is fully charged, the cells would dry up and damage the lead acid plates.

So in this case, what should I do? Wait till charging is completed (and risk damaging the plates) or add water while the battery is charging?

@andromeda pls share your expertise.

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Deal Newbie Deal Newbie
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just add water i add water many times for years without checking chargind dischargins status led acid batteries are tough but without water i just damage it also if takes weeks to charge check battery or inverter mainly battery are old how much old is battery if more than 5 then battery might be issue

Deal Subedar Deal Subedar
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fill till plates are merged in water. Let it charge afterwards and fill rest after it’s fully charged. 

Rajasthan Royals Rajasthan Royals
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5Y means the battery is gone, that’s why it takes so long.

Doctors don’t perform operations when patient is awake. Similarly, always disconnect battery before topping up with DWater.

Water will heat up during charging, overflow and you will have to clean that up. So, do not fill to the brim and leave some gap – personal experience.
 

Deal Subedar Deal Subedar
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Your battery is gone now.
Time to buy new one … Also summer time so electricity shortage is there , so battery usage us more.

Analyst Analyst
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Top it up to the recommended level when it is not being charged/used. This is recommended, but you can always top it up while being moderately used.

From what you detailed, it is likely that the battery has reached it end of life. To be sure you may get it serviced at a near by battery shop. At times, they do top-up with sulphuric acid along with distilled water to maintain the correct electrolyte composition. This will be done after assessing the health/condition of the battery. 

And lastly it is neither good for the battery nor the inverter/ the users around to let it charge continuously for days together. So get it resolved ASAP.



Deal Cadet Deal Cadet
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bftb wrote:

5Y means the battery is gone, that’s why it takes so long.

Doctors don’t perform operations when patient is awake. Similarly, always disconnect battery before topping up with DWater.

Water will heat up during charging, overflow and you will have to clean that up. So, do not fill to the brim and leave some gap – personal experience.
 

Japanese Doctors were doing that exactly during WWII.

Chinese one’s are still doing awake patient organ harvesting in their Camp.

Deal Cadet Deal Cadet
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bhopali91355 wrote:

Japanese Doctors were doing that exactly during WWII.

Chinese one’s are still doing awake patient organ harvesting in their Camp.

what camp?

Elite Elite
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Never let any part of the lead plates get exposed to air. They should always be 100% immersed in water/acid. Plates start degrading when exposed to air. Its very easy to monitor the water levels on batteries that have level monitors. Else with batteries that don’t have the level monitors, keep monitoring the level regularly by opening the caps and fill water. Topping up with water has nothing to do with the charge level of the battery.

In your case the battery has most likely reached its end of life. It reached end of life two years ago (earlier than normal lifetime) probably because the abovementioned regime was not followed. Get a new one and follow the above regime.

Deal Newbie Deal Newbie
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What is the battery backup now as compared to the original? Have you observed any dip in performance?

Deal Cadet Deal Cadet
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Deal-Maker wrote:

What is the battery backup now as compared to the original? Have you observed any dip in performance?

Battery backup may have reduced, but not by much. Didn’t notice any drastic fall in discharge performance.

Deal Lieutenant Deal Lieutenant
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5years is too much 

do u have irregular or frequent power cuts that u rely on inverter ?

Hunk Hunk
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bhopali91355 wrote:

Japanese Doctors were doing that exactly during WWII.

Chinese one’s are still doing awake patient organ harvesting in their Camp.

And modern anaesthesia is a beautiful by product of those inhuman procedures by Japs. 🙂

Deal Cadet Deal Cadet
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hackerboys wrote:

5years is too much 

do u have irregular or frequent power cuts that u rely on inverter ?

used to have frequent power cuts years ago, now it’s rare. Like 2-3 times a year during maintenance or something like that. That’s why I’m not very keen on getting a new battery, will use this one as long as it provides decent backup of a few hours.

But once the battery gets discharged even partially, it charges for weeks.

Deal Lieutenant Deal Lieutenant
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mango-man wrote:

used to have frequent power cuts years ago, now it’s rare. Like 2-3 times a year during maintenance or something like that. That’s why I’m not very keen on getting a new battery, will use this one as long as it provides decent backup of a few hours.

But once the battery gets discharged even partially, it charges for weeks.

esa to nhi hona chye , r u sure its an issue with battery
coz it may be issue with inverter also 
try to put water in battery , then discharge the battery by putting load on inverter for around few minutes 
check how much time it takes to charge now 

Deal Cadet Deal Cadet
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hackerboys wrote:

esa to nhi hona chye , r u sure its an issue with battery
coz it may be issue with inverter also 
try to put water in battery , then discharge the battery by putting load on inverter for around few minutes 
check how much time it takes to charge now 

not sure whether issue is with battery or inverter.

battery is still charging, will have to wait for few more weeks before I can do any testing.

Pro Tech Guru Pro Tech Guru
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Reportedly due to the severe shortage of coal for power generation extensive power cuts could be a regular feature till the onset of the monsoons… 

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