Re: (ET) Alum+h2o replacement for acid in lead batteries

[robert winfield <winfield100 yahoo com>]

i would be quite careful here folks

NaOH + Al + H20 ==> free H2 + very basic ph solution
in a vigerous exothermic rxn

we made hydrogen balloons when i was a kid with this

--- David Roden <etpost drmm net> wrote:

> On 30 Jan 2007 at 9:21, Tim Humphrey wrote:
> 
> > When I was a kid I used to "revive lead-acid
> batteries by dropping an
> > un-buffered aspirin into each cell.
> 
> Quite a few of the snake oil battery cures rely on
> the fact that if a "dead" 
> lead acid battery is allowed to rest for a few
> minutes, it will recover a 
> bit of charge.  
> 
> Even as a battery ages, the concentration of its
> electrolyte and the amount 
> of active material in the grids remain in balance
> (both are declining).  You 
> can add more-concentrated electrolyte to a battery
> and get what seems to be 
> greater capacity.  But then you are overdischarging
> the electrodes since you 
> can't add active material.  
> 
> Simple formula for success : charge the battery
> properly when it needs it, 
> and add nothing but distilled water when the
> electrolyte level is low.  If 
> the battery doesn't have enough capacity to do its
> job, replace it.  There 
> are no "miracle cures" that have any lasting effect.
>  Lost capacity can't be 
> recovered.
> 
> I suspect that at best adding aspirin to a battery
> will do nothing.  At 
> worst it might ruin it.
> 
> 
> David Roden - Akron, Ohio, USA
> 
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