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What does 105ah@20hr mean for a battery?

I'm looking to replace my pop up battery. Ive been looking and im just getting super confused with this electrical stuff. I went to bulbs and batteries and the nice lady recommended a duracell AGM battery thats does 105ah@20hr. I know the 105 ah means amp hours, and to my knowledge thats the batteries capacity. So does this mean this battery can dish out 105 amps for 20 hours straight until it dies? This seems like ALOT of power this battery is able to produce making me think I'm misunderstanding this. Can someone please let me know if I'm correct or put this in a simple way to understand?

11 Answers

  • 1 week ago

    The larger the better if it physically fits.

    In deep cycle marine batteries the AGM type is best and a series 31 is about the largest size and current rating you will find at most stores.

    The 8D size is the largest of all but are hard to find and very expensive.

    My camper currently has a 31 series deep cycle marine battery i got for $99 at Rural King and it's plenty big enough to get the job done.

  • 1 month ago

    It is not guaranteed 105ah@20hr, it is only a suggestion by the manufacturer, for a normal use. The more intense use, the shorter the time before the next recharge of the battery. i.e.: if for 20h, you light up all incandescent lamps, will demand more amperage than if all your lights are LEDs that uses at least 10 times less amps. That will determine the length of time between recharges of your battery.

  • garry
    Lv 6
    1 month ago

    what a 3.2 amp battery .

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    1 month ago

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  • 1 month ago

    Lets say a SLA battery is rated at 20Ah capacity at 20HR. This basically means that the battery can discharge 1 amp per hour over a 20 hour period.

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  • 1 month ago

    Also, don't get confused with auto batteries that claim very high amperage 'Cold cranking amps'.  The actual current a car starting battery will deliver is based on having to do that for just a few minutes or even seconds, and then the running engine alternator immediately recharging it.  They are not a deep cycle battery.  As noted from others, the battery should supply 5.25 amps continuously over 20 hours, or 10.5amps over 10, it is all just math, but an excessively  high discharge rate can warp plates and ruin the battery, and in actual practice, the heavier load will not follow the math and the battery will go dead faster than you think.

  • Rita
    Lv 6
    1 month ago

    Lets say a SLA battery is rated at 20Ah capacity at 20HR. This basically means that the battery can discharge 1 amp per hour over a 20 hour period.

  • P
    Lv 7
    1 month ago

    Pop-up's and rv's use deep cycle car batteries.  It's important that's it's deep cycle otherwise you will kill it.    Basically they are saying you can pull 5.25 amps (105/20)  over 20 hours.    The spec is used on RV's so you can estimate how long you can use it before you need to charge it.  

  • 1 month ago

    It is customary to quote battery capacity that way.  

    What it means is that the battery can deliver (when new) 

    105 / 20 Ah, or about 4.375 amps continuously over a 24 hour period.  

    After that, it Must be charged. 


    If the draw is less, of course the discharge is also less 

    and can be extended over a greater period of time;  

    if it is more, the time must be shorter.   


    Divide 105 by the actual current drawn,  

    which will give you the maximum number of hours for that load.   

  • fuzzy
    Lv 4
    1 month ago

    It would mean that it rated output is only guaranteed for 20 HRs. 

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