Look at LiFePO batteries.  The charging needs are specific (meaning you'll have to make an investment), but they'll maintain voltage (13v+) until they can't, a very sharp knee.

Rick nhc


On 8/20/2017 5:19 PM, Robert Sands wrote:
Why are we stuck with 12 volt batteries of all types when the rigs are
optimal at 13.6 or 14 volts? Anyone know of a 14 volt battery mfg? My
search yields zero.
Bob K7VO

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