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Old 10-28-2016, 04:41 PM
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From Powerstream.com:

"The typical charging voltage is between 2.15 volts per cell (12.9 volts for a 6 cell battery) and 2.35 volts per cell (14.1 volts for a 6 cell battery). These voltages are appropriate to apply to a fully charged battery without overcharging or damage."

Full article:
How to charge sealed lead acid batteries; how to charge lead acid batteries, tutorial for engineers, lead acid chargers.

So, I don't see how a trickle charger that will NEVER go above 13.4 volts can overcharge a 6 cell lead acid battery. And my friend's experience with his collector cars would seem to back that up. Now that doesn't mean you should keep the battery connected to a rapid charger that might put out 14-15 volts.

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Old 10-28-2016, 04:44 PM
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Extended periods of being left on continuous charge is exactly what you don't want to do to a lead acid battery, worst thing for it actually...no matter how low the current is.

Here is a beginners primer on pulse charging you should read, its all you need to know because the science of crystaline growth in lead paste and sulfation can be painful to read. The knowledge isn't new but not that well known outside of battery enthusiasts.

Battery and Pulse Conditioning Primer in NEWBIES START HERE Forum

I leave all my deep cycles, plain lead plate and spiral wound gel batteries in an unheated shed over the winter, I don't look at them again until spring...never a problem and temps go below -40C here at times.

Low current battery minders are old tech from the 1940's, forget about them...they do more harm than good.
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Old 10-29-2016, 05:38 PM
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If you want to know what the maximum voltage is that your charger delivers check it open circuit or when the battery is fully charged. Most chargers will go to 15+ volts without a load. You may have to "trick" your charger by connecting it to a battery and then connecting your volt meter to it before disconnecting it for an open circuit voltage test.
I have been working with lead acid batteries in all kinds of applications for most of my working life. I have done load tests, equalized electrolyte after spills, and replaced bad cells individually.
Here is a load test sheet to test a battery:
Attached Files
File Type: pdf SixHourBatteryTest.pdf (47.7 KB, 26 views)
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