Jeff,

I think the general recommendation would be to do this with a DC-DC charger.  However, a while back I stumbled on a YouTube video from a guy suggesting that you could just directly connect lithium and lead-acid batteries: https://www.youtube.com/watch?v=tAuPfgZgXec

Please let us know what you decide and how it works out.

—Peter

> On 2023-06-22, at 07:28:47 EDT, Jeff Smith Photo wrote:
>
> I’m going to be using a trolling motor on my inflatable for a cruise where I 
> will not have access to AC for charging. Does anyone know whether I can hook up 
> a lithium ion battery to my bank and have it charged by my 8 hp electric at the 
> same time as my house batteries?-- 
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