The cost of the 36 v li-ion battery, which we can provide, (shoot me a message or email) and then the installation into the battery box, which Noe can tell you, he has done many of them, should not be too bad at all, sometimes the molded cradles for the older lead-acids have to come out, in order to make a good space for the larger single battery. Example pik here, this one is 48 V but essentially the same thing. If the cart has 12 V accessories, we also have low cost voltage converters to step down the higher single battery voltage just to that circuit, to run those things on the cart like lights, etc.
Turns an old cart (like in the image) into a zoom-zoom new cart and also getting nice feedback on the suspension as well, since removing about 200 pounds in battery weight helps on the cobbles and topes. 🙂