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I presented my solution to boosting voltage a few years ago:
Take a 6 and a 8 volt deep cycle battery of the same make and size and wire them in series.
A 7 cell battery should have a 14.9 volt open current resting voltage, should be considered "dead" at 12.2v. Under load I would expect a 7 cell battery to have about a 14.4v, +/- 0.2v under load.
Only problem I see is you would need to devise a special 17 volt charger to charge them up. Or attach each one to its respective 6 and 8 volt chargers.
Or go with a LiFePO4 battery. Normal volts for 4 cells is 13.2 and 12.7 is considered "dead".
For voltage dips causing dimming head lights use LED.
My LED head lights are full brightness down to about 11 volts and draw 7 less amps in low beam.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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