[Elecraft] Powering KX3 from Bioenno charger with battery in between

[Julia Tuttle]

Oh, pardon, it is LiFePo4:
https://www.bioennopower.com/collections/lifepo4-batteries-for-communication-equipment-ham-radio/products/12v-20ah-lfp-battery-pvc-blf-1220a

On Tue, Oct 19, 2021, 20:08 <ho13dave at gmail.com> wrote:

> You don't give the chemistry of your battery, and that is important. If it
> is LiFePo4 you don't want to leave it connected to the charger all the
> time.
>
> Here is some good info:
>
> https://www.solacity.com/how-to-keep-lifepo4-lithium-ion-batteries-happy/
>
> 73, dave
> ab9ca
>
>
>
>
>
> Sent from my iPhone
>
> On Oct 19, 2021, at 16:16, Julia Tuttle <julia at juliatuttle.net> wrote:
>
> Hi,
>
> I've got a Bioenno battery (it's so good!) and the stock 14.64 V (no-load,
> by my cheap meter) 4 A (claimed) charger. I'm currently planning to just
> leave things plugged in (mains to the charger to the battery to the radio),
> and I want to make sure that's safe (won't start a fire and won't damage
> the charger, battery, or radio).
>
> Here's why I think it is:
>
> Will I overload the charger? No, the KX3 draws well under 4 A. If the
> battery is charging simultaneously, the constant-current circuitry will
> adjust the voltage down until the two loads together are drawing less than
> 4 A, at the cost of lower charging speed, lower output power, and/or higher
> PA heat dissipation.
>
> Will I overcharge the battery? 14.64 V works out to 3.66 V per cell, which
> looks like it's about 93% state of charge, which is fine for the battery
> long-term.
>
> Will I overvolt the radio? No, 14.64 V is under 15 V.
>
> Am I missing anything here? Is this a safe way to leave things long-term?
>
> Thanks,
>
> Julie
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