Charging Yellow Top Optima batteries starting from low Voltage.

[lonelytree]

Hi Folks,
  I just picked up a Trace 1512 inverter, fuse, solar panel, solar controller, PowerPlus pinger, cables etc.... Unfortunately, the batteries have not been used for a couple years. They are Optima D31T yellow tops. I called the dealer here in Alaska and he was .... not a hired killer by any means. "Just charge them" "Just like a car" "Doesn't matter how many amp charge". I got a decent deal, but if I can save these batteries it is a nice deal. Anyone revive old gel cell batteries successfully? I have 6V golf cart batteries in case these end up as cores. I would lose a lot of power doing it though.

Thanks,
Mike

[MountainDon]

The D31T is a dual purpose yellow top; engine start and deep cycle. Good for Vehicles with winches that get used heavily.

Here's a link to Optima Batteries charging recommendations.
http://www.optimabatteries.com/product_support/charging.php#yellow1

Basically they can be charged at high current rates as long as the temperature is held to a maximum of 125 F AND the voltage is kept below a maximum of 15.6 volts.


Just a note: An Optima battery is not a gel cell battery. An OPTIMA is an AGM battery. The acid electrolyte is held in a special finely porous glass mat. The electrolyte is still liquid, but the sponge like glass mat will hold it even if the case is cracked.

A gel battery design is typically a modification of the standard lead-acid automotive or marine battery. A gelling agent is added to the electrolyte to reduce movement inside the battery case. Many gel batteries also use one way valves in place of open vents, which helps the normal internal gasses to recombine back into water in the battery, reducing gassing.

Most gel batteries have a much higher internal resistance, meaning they will not be able to deliver and receive current as efficiently. This is especially apparent at higher amperage levels. For example, most gel batteries will not work successfully in engine starting applications.

Gel batteries also must be treated more gently when charging.

[ak_rob]

Batteries Plus in Anchorage or the valley will charge them and test them for $10 each. I have (4) 6volts I got for free in there right now.

Rob