Michael Rigby-Jones wrote:
>   
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
>>     
> Behalf
>   
>> Of John Gardner
>> Sent: 11 June 2010 02:03
>> To: Microcontroller discussion list - Public.
>> Subject: Re: [EE] Desulphating batteries with Epsom salts
>>
>> Yes, that's correct, for the batteries I mentioned.
>> Gel cells have the virtue of very low impedance,
>> which is good for wheelchair apps. The tradeoff
>> is fewer charge/discharge cycles - All the more
>> reason to take good care of them.
>>     
>
> AFAIK gel cells typically have a *higher* internal resistance than
> flooded lead acid cells due to decreased ion mobility in the
> electrolyte.  Absorbed Glass Matt cells (often confused with gel as both
> are sealed) have equivalent or sometimes lower internal resistance.
>
>   
That's my experience too, in real life and datasheet.
Also gel cells more easily destroyed or short life from
* Overheating (Charge, discharge or Ambient electronics in same box)
* Leaving near discharged
* Deep discharge.

Using same AH gel as replacement for "wet" battery in a Motorcycle will 
last only a few weeks as the starter motor stall/startup current is too 
high.
There are some gel cells specially designed (or maybe just marketed) for 
higher peak currents.

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