They suffered from decreased range and speed if not pre-heated. The lead/acid battery of the G7e was pulled every few days for maintenance and such to keep up the reliability.
If I remember correctly for peak performance the electric torpedo had to be pre-heated to 80 degrees Fahrenheit. If they weren't they suffered from decreased range and speed
(I'll have to check more when I get home. Have a decent book about it but they don't exactly like me reading that stuff here at work lol)
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