I don't have a Honeywell ELT battery, but here is a picture of the lithium pack for an Artex C-406
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The 4 green cells are each about the size of a D battery. The small circuit board has 2 fuses and a small ic for monitoring the condition of the battery.
You can see 4 small black parts, 1 across each cell. They are diodes so if a cell goes flat it won't see reverse polarity.
But if one of those diodes short, you will have a dead short across that cell.
I am trying to work up the nerve to short a diode out and see what happens, but I'm a little chicken at this point.
And the boss said if I burn down the hangar I'll be in trouble.
