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There are a lot of factors in play. This thread has been going on for almost four years and the availability of replacement batteries has increased quite a bit over that time. What country you're in comes into play, too. We have people from Europe/UK, Canada, US, and Australia and the available selection can be very different. Those in the US seem to have the greatest number of options. I did my conversion almost three years ago and at the time there were very few GC2 form-factor lithium batteries in the US market, and really only one maker that had 48V batteries with a high enough constant amp output to match the Hisun motor. You could probably spend anywhere from $1,500-$5,000 US depending on what combination of amp output, capacity, and form factor you're looking for. GC2 form was important to me so I could just drop in replacements without customizing the tray to hold a physically larger size battery, but some of the conversions here did do just that. You'll pay more for batteries that have cross-BMS connections so all the batteries "talk" to each other to optimize output and charging, but depending on your use that may not be necessary with batteries connected in parallel. Gorj got to 48V using 12V batteries wired in serial, I and a number of others went with 48V batteries and went for increased amp output and capacity by using (generally) four GC2 form factor batteries. Some of the conversions just used one or two very large form factor batteries. Most of us also added a digital readout. You just have to weigh your own local battery availability, cost, ability to customize, time, performance needs, and how long/far you want to be able to go between charges (capacity). For me, four 48V batteries that combine to 120ah and a continuous output rating of 400A has been great on my 6 acres of wooded property with lots of uneven ground and some fairly steep hills. I never get below ~70% in a day even when running a 120V inverter for power tools, but I also get to plug in the evening. If you plan on going far into the wild for a few days then of course you will need more capacity. If that includes heavy loads and steep hills you want to make sure your amp output is at least 400A. By going with the 48V GC2 form batteries, I reasoned that if I later found I needed more capacity I could easily just add more batteries in parallel. I've found those four have been enough for me, but I can see how others would need more. The good news is that there are a lot more options now than years past and you can customize your solution to you.

It seems that most everyone who does this has a different way of doing it. I replaced the eight 6 volt lead acid batteries with four 12 volt 100 amp lithium batteries. They have been installed over six months and have worked very well. I also replaced the Hisun charger with a lithium charger. I also installed a voltage meter in the dash to monitor the battery voltage. In the summer I charge it about once a week. In the winter I charge two or three times a week, depending on how much I use it. I sold the eight 6 volt lead acid batteries for $75. Was happy to get rid of them! Personally, I think Hisun should charge a bit more for the E1 and install lithium batteries in them instead of lead acid batteries. There are several companies selling EV side by sides with lithium batteries that are priced only slightly higher than Hisun!

My project will battery cost around 2000$ with bms and a new charger 60 amp cost 250$ I'll do all y work my selve. I'll try to sell the original battery pack