Yes, we do these conversions. There are about half a dozen battery companies out there selling what they call a golf cart battery pack. Most of these are of low quality- long on promises, and short on driving range. We experimented with a couple of these, mostly resulting in quick full refunds at our urging, and we made the vendors make us whole, too.
We have happily settled in on one company, ReLion, which has a solid Lithium offering. They are big in the RV world, too, and came over to golf a few years ago. They had some hiccups in the beginning like the others, but we have worked with their engineering team back East to get things right.
The catch, like most things, is that you get what you pay for. The system is expensive to both of us, we use two of the 48V batteries for requisite range, and it requires some significant rewiring of the golf car. We complete the full system conversion, including harnesses, power assembly, state of charge meter, and dedicated matched charger, and stand behind it with a 7-year MFG warranty and a life-time installation warranty. The whole thing runs about $4500 all-in for your car. Or you can buy most of the kit online and build up the harness yourself, too, and save maybe $600-900, when all is said and done.
This ReLion approach, compared to a new RXV Elite with the Samsung system with 8-year warranty, has found some happy acceptance in the market. But if you want the very best, we can happily upgrade you.
The middle ground approach is a used RXV Elite with a 3-year battery warranty from EZGO / Samsung.
You have options! Let us know how we can help.