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Thread: Need Urgent help for buying Lead Acid Battery

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    Default Need Urgent help for buying Lead Acid Battery

    So here is the thing I need to buy 100/130AHr lead acid deep cycle thick plate battery, now i have talked to a shop and they have asked for

    8300 for 100Ahr Hamko battery
    and 9300 for 130AHr Hamko battery.

    and I have an ignus deep cycle 100AHr battery which might have 12-15AHr capacity left.

    Now the help I need is information of good battery and place where they are sold, also price and warranty.
    Plus i need to know if I can recover this battery somehow and if not how much should i expect if i need to sell it.


    In a hurry so please be quick! any help will be appreciated. Good day!

  2. #2
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    Hamko would be a goog choice. Just try to buy the batteries from a known shop. Known dealers can be realllly helpful when u need to claim warranty.

    u won't get more than few hundred taka for the old batt.you can buy the hamko batt from a dealer who has his shop at ground floor of my home.

    - - - Updated - - -

    R these for ips or ups?

  3. #3
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    Quote Originally Posted by minitt View Post
    Hamko would be a goog choice. Just try to buy the batteries from a known shop. Known dealers can be realllly helpful when u need to claim warranty.

    u won't get more than few hundred taka for the old batt.you can buy the hamko batt from a dealer who has his shop at ground floor of my home.

    - - - Updated - - -

    R these for ips or ups?
    I'm kinda skeptic about this brand, although all across the country I'm seeing shops selling their product, the other options that I have is Hummer/Lucas or maybe Spark/Volta.

    so what do u think? the price ok?

    dont have anyone on the ground floor but know a guy who has a shop nearby, he also wanted to bring the battery to my home for free.

    mostly for IPS but i might deploy a simple switch to use it with the UPS in dire need too. and my plan to charge this battery is with a Rahimafrooz Volta Plus 400VA unit, pretty old though.

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    lol u misunderstood due to my typo. I wanted to say that u should buy from a known dealer and I know a hamko battery seller whose shop is located in my building's ground floor.

    - - - Updated - - -

    If that Rahimafrooz Volta Plus 400VA unit can put out 13A you should be fine with a 130Ah battery.

    If you UPS has 24V system (2 battery) you will not be able to connect it your IPS which is a single battery 12V system.

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    Quote Originally Posted by minitt View Post
    lol u misunderstood due to my typo. I wanted to say that u should buy from a known dealer and I know a hamko battery seller whose shop is located in my building's ground floor.

    - - - Updated - - -

    If that Rahimafrooz Volta Plus 400VA unit can put out 13A you should be fine with a 130Ah battery.

    If you UPS has 24V system (2 battery) you will not be able to connect it your IPS which is a single battery 12V system.
    oww khilgaon?

    hey i know the basics btw its a single battery system so yes 12V and it initially came with with a 100AHr battery so 130A should be fine, might a take a little longer to charge thats not a big issue here.

    - - - Updated - - -

    btw do u think the guy you know can deliver a battery to motijheel?

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    Hamko batteries are good . infact I think they are better than rahimafroz. We are using two of them.

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    Quote Originally Posted by Mohiuddin View Post
    Hamko batteries are good . infact I think they are better than rahimafroz. We are using two of them.
    thanks for ur input, i just need to make sure it lasts like the other ignus batteries i have in my home

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    Update: Bought a Volvo Solar 130AH heavy, Tubular battery for 14K. currently it is at charging, lets see how well it works, it has 24 months warranty btw although it is the same with the 5 year warranty when sold with solar panels.

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    Can you all experts help me choose the perfect batteries for my UPS? I am using a Spark Power 1200VA and the battery seems to have given up on me just around the 9 month mark, and since the UPS warranty only covers the battery for 6 months, I believe I'm screwed.

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    Quote Originally Posted by Fox Mulder View Post
    Can you all experts help me choose the perfect batteries for my UPS? I am using a Spark Power 1200VA and the battery seems to have given up on me just around the 9 month mark, and since the UPS warranty only covers the battery for 6 months, I believe I'm screwed.
    you have to replace them, just like we all did, the PG 1200VA UPS that I'm using came with two 7AHr SLA battery and I swapped those with two 9AHr battery, still running fine.

    without any modification you can't add different sized battery although you can add a battery with higher capacity that will give you a little backup time boost, as far I remember those were PC power batteries and bought them from IDB ground floor each cost me around 1k.

    you can also look into different manufacturer like Long, which I believe is available in our country.

    - - - Updated - - -

    *slightly higher capacity

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    Quote Originally Posted by Fox Mulder View Post
    Can you all experts help me choose the perfect batteries for my UPS? I am using a Spark Power 1200VA and the battery seems to have given up on me just around the 9 month mark, and since the UPS warranty only covers the battery for 6 months, I believe I'm screwed.
    if u want best of the best then try yuasa battery - Computer Source probably around 1600 taka per piece 9A

    or Ritar battery from http://unitedsysnet.com/un/?page_id=91 9A around 1200

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    I guess I can live with the second best, but how do I know if these batteries are compatible with my UPS?

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    Quote Originally Posted by Fox Mulder View Post
    I guess I can live with the second best, but how do I know if these batteries are compatible with my UPS?
    Click image for larger version. 

Name:	battery.jpg 
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    If it is like this and if its a 12V lead acid battery it will be compatible with your system. yet you can open up your UPS and check for the battery first.

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    And how do I know if I will require modding? Lets say I don't wish to give a dime to anyone for assembling the new batteries (I would very much like to do it on my own) Will I face any difficulties?

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    Quote Originally Posted by Fox Mulder View Post
    And how do I know if I will require modding? Lets say I don't wish to give a dime to anyone for assembling the new batteries (I would very much like to do it on my own) Will I face any difficulties?
    for the last 7-8 years I'm doing this thing, and i can tell you, all you need is a screw-driver a standard phillips screwdriver. sometimes you might need to use a little force but its okay.
    and you will need modding if you want to install large sized battery packs.

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    Quote Originally Posted by redwan hasan View Post
    Click image for larger version. 

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    If it is like this and if its a 12V lead acid battery it will be compatible with your system. yet you can open up your UPS and check for the battery first.
    can two 7.0Ah battery handle the in rush current of 650w+30w ??? Even if just for 10 mins?

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    1. inrush current only lasts few seconds at max. usually few micro seconds.

    2. Inrush current handling capacity mostly depends on the UPS inverter. But even a capable inverter will fail to handle inrush current if the batteries are under charged or too old. @VANGUARD

    so yes if you have a good ups with capable inverter it should hold just fine with fully charged battery( 2 x 7.0Ah)

  18. #18
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    Quote Originally Posted by VANGUARD View Post
    can two 7.0Ah battery handle the in rush current of 650w+30w ??? Even if just for 10 mins?
    that will depend on the circuit itself and different 650W+30W load will have different amount of inrush current.
    inrush current stays only for micro seconds.

    if you wanna know if the two 7AHr 12V battery can sustain the load for 10 min, well again depends on the circuit itself.

    - - - Updated - - -

    Quote Originally Posted by minitt View Post
    1. inrush current only lasts few seconds at max. usually few micro seconds.

    2. Inrush current handling capacity mostly depends on the UPS inverter. But even a capable inverter will fail to handle inrush current if the batteries are under charged or too old. @VANGUARD

    so yes if you have a good ups with capable inverter it should hold just fine with fully charged battery( 2 x 7.0Ah)
    there is something else, well the 7Ahour battery doesn't mean it can only provide 7A, it will surely provide way more than that, and most UPS circuits are made in that way to withstand the inrush current.

    and another very important thing is running system on ac and suddenly power loss occurs and UPS go into inverter mode wont even have to handle the inrush current because there will be none.
    only if u need/try to start something with the inverter then you will have to worry about the inrush current

    - - - Updated - - -

    btw about the battery I bought, it took about 14 hours of initial charging, then kept in on trickle for couple hours and tested with 150W load, and after even 40 min of backup battery voltage didn't even drop and turning ac power back on it took only 2 minutes to get the battery fully charged again.

    shopkeeper told me this 130AH can act like a 200AHr battery which is BS but it surely can act like a 150AHr battery.

  19. #19
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    Quote Originally Posted by redwan hasan View Post
    that will depend on the circuit itself and different 650W+30W load will have different amount of inrush current.
    inrush current stays only for micro seconds.

    if you wanna know if the two 7AHr 12V battery can sustain the load for 10 min, well again depends on the circuit itself.

    - - - Updated - - -



    there is something else, well the 7Ahour battery doesn't mean it can only provide 7A, it will surely provide way more than that, and most UPS circuits are made in that way to withstand the inrush current.

    and another very important thing is running system on ac and suddenly power loss occurs and UPS go into inverter mode wont even have to handle the inrush current because there will be none.
    only if u need/try to start something with the inverter then you will have to worry about the inrush current

    - - - Updated - - -

    btw about the battery I bought, it took about 14 hours of initial charging, then kept in on trickle for couple hours and tested with 150W load, and after even 40 min of backup battery voltage didn't even drop and turning ac power back on it took only 2 minutes to get the battery fully charged again.

    shopkeeper told me this 130AH can act like a 200AHr battery which is BS but it surely can act like a 150AHr battery.
    in reference to the bold section: actually there is a inrush current, identified and well documented by all Major UPS manufacturer. I remember providing you the APC article before.


    Implications for UPS Selection
    Because of the way active PFC’s operate, they can sometimes overload the UPS with momentary high inrush current. This can occur when the UPS transfers from online to on-battery operation, creating a momentary loss of power (<8ms). The PFC supply may respond by temporarily drawing an excessive amount of current.

    There is another article with lab test that shows the voltage sag during switching and spiked power draw when ups started providing power.

    I attached the article. Go through it.

    http://www.apc.com/prod_docs/results..._id=&wpnum=147

    Proper UPS selection for servers with active PFC power supplies

    AN-147 v2

    and btw this is THE most common problem of typical UPS failure and typical complain that goes as follows " Current chole gele amar PC restart mare ken!! amar to UPS ase. Restart marar por pc shundor ups diya chole"
    Last edited by minitt; June 14th, 2015 at 03:09.

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    I used to be keen on learning stuff but these days I just don't have it in me, TL: DR please?

    And for the record: My PC doesn't restart when the electricity goes out. However, I think I shortened my battery's lifespan during some marathon week long electricity cuts when I used it to charge my cellphone?
    Last edited by Fox Mulder; June 14th, 2015 at 03:53.

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