Also, the internal BMS of a 12V battery cannot handle more than 12V unless
designed to.
Phil
On Sunday, February 15, 2026 at 10:56:45 AM EST, Peri Hartman via EV
<[email protected]> wrote:
Neither am I an expert, most of the active people on this list know much
more than I.
I'm also wondering what kind of batteries or cells you purchased. Did
you buy 12V automotive lithum batteries, meant to be a 1 to 1
replacement for lead-acid ? If so, I believe they come with a built in
battery management system (BMS). Assuming so...
However, and others can correct me here, connecting them in serial to
give you higher voltage could be problematic. If one battery begins to
fail sooner than the others it may, for example, develop higher internal
resistance. That means it will heat up more when the current from the
rest of the string pushes through. I think that could be a fire risk or,
at least, cause more rapid deterioration.
My guess is the right way would be to connect them in parallel and then
use an inverter to convert the output to the voltage you need.
Peri
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------ Original Message ------
From: "EV List Lackey via EV" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Cc: "EV List Lackey" <[email protected]>
Sent: 15-Feb-26 06:21:53
Subject: Re: [EVDL] Lithium Ion batteries
>On 15 Feb 2026 at 8:52, DOOLEY PHILIP G JR via EV wrote:
>
>> Also my cells were shipped dry. What do I used to fill the cells?
>
>Are you sure that's what you have?
>
>I admit I'm far from a lithium expert, but I've never heard of or seen "dry
>charged" lithium cell, or cells with any kind of electrolyte access at all.
>The ones I've been introduced to have been sealed.
>
>You might want to snap a picture of your cells, especially any labeling on
>them, and post it somewhere publicly readable without a login. Then post
>the link here.
>
>I've used postimages.org for years, but lately they seem to have gotten
>kinda naggy about signing up for their rather expensive memberships.
>
>David Roden, EVDL moderator & general lackey
>
>To reach me, don't reply to this message; I won't get it. Use my
>offlist address here : http://evdl.org/help/index.html#supt
>
>= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
>
> First Law of Bicycling: No matter which way you ride, it's uphill
> and against the wind.
>= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
>
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