JRDG Coherence II; Battery Display Issue

Uck.... Looks like the 3 days long battery drain zeroed the battery and possibly inverted their polarity as well. Remember to apply a touch of vaseline or similar lubricant onto the walls of the battery compartment, to prevent the fresh set from ever getting stuck inside. There is a specific JRDG bulletin, which states....

"placement Battery Installation

The replacement batteries for the Coherence and Coherence II preamplifiers are chosen specifically to fit into the holes cut into the preamplifier power supply chassis.

To install the batteries, please observe the following precautions:

• Unplug the power supply from the AC outlet.
• Disconnect the preamplifier from the power supply.
• Using a cloth or paper towel, rub a light coating of Vaseline or petroleum jelly on the inner walls of the battery pockets of the power supply chassis. This will prevent the batteries from becoming stuck in the future if there is any sort of swelling or shape increase. Note: Do not place the petroleum jelly directly on the battery, as it may cause you to lose control of the battery and drop it during installation."

Stew, the batteries aren't bad to replace. I sent mine in to JRDG, but thinking about it, they could probably just ship you the batteries and you could do it yourself.

I've used their email message service from their website and rarely get a response back, even after 2-3 weeks. When I call them they are usually very responsive. I just thought it was more 'polite' to email, but calling them gets you a response quicker.

Do lead acid / Gel / glass matt batteries invert? I know my NiMh batteries can and do. The battery pack for my camera is 10 AA cells in series so if I have a weak cell, I'm a goner.
I'm working on a replacement / fix / rebuildable now since Canon gets 100$ and the aftermarket stuff sometimes is of suspect fit.

Magfan, the JRDG literature is not terribly specific. It states only that excessive drain may damage the Lead-Calcium batteries of Coherence. Actual polarity inversion is a pure fruit of my own guesswork. Needless to say, the application of a non manufacturer-supplied battery cell to an electronic device like Coherence II is a recepy for expensive, and sometimes fumiginously stinky fireworks. G.

Replacement of the batteries has solved the problem. Battery charge now reads FULL. I guess the lesson is that when the battery no longer reads FULL, it is time to replace. Perhaps I will try to listen strictly off the battery, but previous experiments yielded no audible benefit. Thanks to all who posted in response.