Quote Originally Posted by Southeasttackle View Post
No! You can't get a voltage spike from a battery! Each car battery only has six cells in total they produce 12.5 volts. ONLY 12.5 volts. They can not produce any more. That is basic electricity. And how do I know? Well, I am a ASE certified master auto technician and have been for 18 yrs.
If you think that a battery can produce voltage beyond 12.5 volts feel free to explain your "theory."
You can have a spike of amperage however. It happens often when a motor is started. But that is not related to the battery at all. You can connect a amp meter to a trolling motor and turn it on. You may often see a spike in amperage then a sudden drop to what is the normal running voltage. There is no difference in a car battery than a deep cycling battery other than a deep cycling battery is built for constant discharge and recharge.
They have no internal regulator!
Well you are partially right. You don't get a spike from a battery. The trolling motor can cause surges in the way of start current and stall current. (and there is a difference between a spike and a surge) A battery doesn't produce anything, it stores it. A marine battery that measure 12.5 volts is 90% discharged. 12.6-12.7 volts, depending on the temperature, is fully charged. These are not my theories, its what the manufactures tell me.