Here is some interesting info that I have found.
...... jimmy
Optima Sprial-wound Batteries
http://www.interstatebatteryofdet.com/Optima2.html
http://www.optimabatteries.com/product/marine/body.htm
Technical Specs
http://www.acdelco.com/parts/1505.htm
Deep Cycle Battery FAQ
http://nyquist.ee.ualberta.ca/~schmaus/dcbat.html
Glossary
http://www.interstatebatteryofdet.com/glossary.html
James R MacLean wrote:
>
> Does anyone have a site or reference to get a good course in lead acid
> battery charging and maintenance? I am not happy with the performance and
> lifetime we are getting out of our batteries and I want to purchase or
> build appropriate equipment to improve if possible. I have some specific
> questions related to the subject- Does charge current have much to do
> with the charge efficiency? For example, can you charge a 200 A/H battery
> with 1.0 amp and expect to get a full charge and what is the charge
> efficiency? ( 200 hours?, 300 hours? to full charge)
>
> What is the float charge voltage and its temperature coefficient?
> (2.430v?)
>
> Is it good to have a small charge current all the time and how much
> relative to battery capacity.
>
> How do you know the battery is fully charged / when to terminate charge?
> How is this affected by the charge rate?
>
> Has anyone used a float/maintanence charger and had good results with it?
> What model and price?
>
> As of now my plan is to continue to replace our twelve volt batteries
> with six volt pairs. I can buy really rugged golf cart batteries (Trojan
> 220 A/H) for a better price than the twelve volt and get much higher
> capacity. Also the retriever runs on 6 volts so I can cycle batteries a
> bit. I plan to build a series of constant voltage/ current limited
> regulators to put the batteries on constant float charge. That is why I
> am asking about LONG charge times and float voltages. Of course, a
> regular charger can be used to get most of the charge returned and then
> go on the float charger.
>
> The economics of the 6/12 volt choice work out as follows: I paid $110
> for a Trojan 12 volt deep cycle 135 A/H battery which lasted two years. I
> just paid $55 each for two 6 volt 220A/H Trojan T-105 golf cart
> batteries. The price is the same but the capacity is almost double! I am
> told the T-105 is an excellent battery which will take all sorts of abuse
> and use. Its price is more reasonable because it is produced in a very
> high volume compared to the 12 volt battery. I expect it to take the high
> peak currents better and this is the largest battery that I am strong
> enough to move (takes two trips to the car though! actually three -
> retriever battery also).
>
> Another idea goes like this: the two batteries must be connected by a
> HEAVY strap about 8 inches long. Make it out of brass and locate two
> small terminals nearly at the ends near the battery terminal holes.
> Calibrate the resistance and design a small battery powered amplifier to
> read the current directly. This will give information relative to the
> winch motor and launch force/torque. I just have to look up the volume
> resistivity of some suitable materials and the rest is pretty easy since
> the voltages will be measurable at the high currents we use even with a
> big thick strap!
>
> Thanks for reading this far. Any thoughts appreciated. Hope that Visalia
> was fun for many - sure wish I didn't live in Florida this weekend!! Jim
> MacLean
>
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