[Fot] Battery ?

[Mike Harmuth]

I just replaced an 11 year old Optima battery that I thought was on it's
way out but it turned out to be the alternator. I used to have lead acid
batteries but they seemed to die after a year or so, I suspect the
vibration was causing internal damage. The new Optima battery was ~$175,
delivered, on line, $60 more than an AGM, glass mat, battery of similar
capacity, that I could get locally. My good luck with the old one was a big
influence in the decision. The "worn" out one is going in a street spit I
own next spring.

mike

On Mon, Sep 16, 2019 at 12:07 AM Ponostyle via Fot <fot at autox.team.net>
wrote:

> If you want to get a seriously good battery then Lithium is the way to go.
> Unfortunately there are several issues that make that decision a little
> tricky. If the car is going to charge the battery instead of running it
> total loss and charging in the pits, then you have to accept certain
> limitations in the battery—like it might die fairly quickly. Most people
> don’t want to rewire their car to accommodate a lithium battery, so even
> the eye-wateringly expensive (a thousand bucks and up) are designed with a
> simplified BMS system that protects from overcharging by disconnecting the
> battery. If your electric system can live with that, then you might as well
> buy one of the cheaper ones ($150-ish) and see how it goes. The best way to
> manage a lithium battery is to keep it connected to the car but disable
> charging when the cells reach about 95% charge, and disconnect the battery
> entirely if the cell voltage gets to 20 percent or so. If you do that the
> battery will outlast the car. If you don’t, it might die the first time you
> overcharge or completely drain the battery. Any battery with an internal
> BMS and just two terminals can’t just shut off charging.
>
> Lead acid batteries respond to overcharging by going into electrolysis and
> generating oxygen and hydrogen. Nothing terrible happens unless it goes on
> too long without adding water, or you manage to catch the hydrogen/oxygen
> mixture on fire, in which case it turns back into water and disassembles
> the battery.
>
> Unless you are prepared to build your own battery from a box full of LiFe
> cells, add your own BMS and control charging I suspect you should get an
> AGM and be happy. Optimas are not all that special.
>
> On Sep 15, 2019, at 8:38 PM, Nick Black via Fot <fot at autox.team.net>
> wrote:
>
> Its time for some new electrons in the Duke of Oil (TR4A as named by
> Hardy's wife Ellie) and there should be something better than a heavy ole
> wetcell type. I know some of the Optima batts are popular, but what is the
> flavour du jour? And will it need some sort of special charger?
> OR
> Should I just go get another wetcell type?
>
> Thoughts and considerations?
>
> Outta juice here in NorCal
> Nick
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