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If you have a consistent light source, this is a good modification particularly for cars that aren't daily driven. The alternator works pretty hard to charge a dead battery, since lead acid batteries are so inefficient, and alternators are also inefficient.
With a very high current capable lithium ion battery, the charging efficiency goes up, but the alternator is still burning fuel.
On my (deceased) MR2, I put a few solar panels on the dash to keep the small lithium ion battery topped up, as I only drove it maybe once or twice a month. No more slow struggling cranking, no more battery damage, probably some amount of fuel savings.
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