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We're talking about typical lithium batteries, like 18650 cells, judging by the voltage you're trying to achieve. 14.6 would be perfect for LiFePO4 cells, if you don't already own the lithium cells you're mentioning.
I'm not having much luck finding a matching charger. You can buy DC-DC voltage converters that will bump the voltage up. Your challenge there is convincing your smart charger to turn on and stay on to deliver power to the DC-DC converters. Using those will result in a "dumb" charger, so you'd better be sure to use a BMS to protect your cells.
You could build your own charger out of an old welder, but chances are if you have to ask, you don't have the knowledge/skills to do this on your own. Transformer based chargers won't be very efficient.
Delta-Q chargers are efficient and programmable from the manufacturer, but they're on the wrong side of the pond and generally avoid dealing at the consumer level. You might have luck finding a Chinese manufacturer who will send you a charger to your specifications. Look for the guys selling chargers that ask you to supply your chemistry and voltage needs.
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