AGM battery for Gen 4/Gen 5 Prius/Prius Prime and observations on the 12-V charging system

Discussion in 'Gen 5 Prius Main Forum' started by Gokhan, Sep 20, 2024.

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  1. mc510

    mc510 Junior Member

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    Thanks @Gokhan, got my order in for the Uplus battery and the Noco Genius 1 already arrived (same day delivery)! I thought I had read a comment here that Genius 1 is adequate, but I see that the package says that it will charge batteries up to 30Ah, and Amazon says that the battery is 50Ah. Not obvious to my why the charger would care about the ultimate capacity of the battery, but if the charger stops at 30Ah that would kind of defeat the whole point of pre-charging! What do you think, do I need to return the Genius 1 and find a neighbor who has a powerful charger that I can borrow?

    [edit] According to the product page on the Noco web site, the Genius 1 can charge larger batteries but will take a long time ... 40Ah at 30 hours, 80Ah at 60 hours, 100 Ah at 75 hours. That makes more sense to me; still confusing why the package says only up to 30Ah [/edit]
     
    #261 mc510, Jun 14, 2025 at 5:30 PM
    Last edited: Jun 14, 2025 at 6:05 PM
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  2. Gokhan

    Gokhan Senior Member

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    Hi there,

    Yes, the Uplus EN LN1/DIN H4/BCI 140R AGM is the best battery for Gen 4/Gen 5 Prius HEV/PHEV.

    Yes, Noco Genius 1 is perfectly fine. Ignore the longer-charge-time disclaimer.

    The way the Noco Genius charging profile works is that the last phase is a small-constant-current phase, and the charging only stops when the voltage very slowly reaches the target at that slow constant current. Therefore, it makes no difference whether you have the 1-A charger or 10-A charger because it takes about 48 hours to fully charge according to Noco’s standards, which is indicated by the green LED having stopped slow-blinking and become solid.
     
    #262 Gokhan, Jun 14, 2025 at 6:14 PM
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