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The parking brake on this unit is a JOKE.  It is a very crude disk brake on the drive shaft. I can imagine that it could NOT release if left engaged for a long period of time. But since it rarely works well I do not think that would be an issue, unless it had recently been adjusted to work. I find that after adjustment it works well for only a few weeks. It is a VERY POOR design. I carry a block of wood in mine to put under a wheel to hold it on a slope! I have discussed with my dealer about this issue, but have received no satisfaction . I have considered installing a brake line cut-off valve. It works by holding the pressure on your brake fluid (like having your your foot on the brake all the time), then when you push on the brake pedal it releases.

The parking brake on the E1 is a very poor design. In the year I have owned it I have had to adjust it four or five times. I have to adjust about every month to six weeks. I think it was designed by an idiot. Which is possible because there are a bunch out there! I may have to put a hydraulic lock on the brake system. That will lock all four wheels. 

It looks like one would need to use one of their chargers to have the ability to use their app.

I have not found anything but a pdf file that list the specs. Hisun does not seem to customer friendly. I have managed to get my local dealer to photo copy some mechanical and wiring diagrams.  If you don't have a good local dealer you are on your own with Hisun.  They are more of an assembler than a manufacturer. They are shipped in from south east Asia in pieces to North Texas, assembled and then shipped to dealers.

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Might try checking to see if your wheels are tight. Lit it up in the air at each wheel and see if there is any play in the wheel. If so take out the cotter pin and tighten the nut. Simple.

I have never liked the cord in the glove box to charge the E1. It takes up to much room and in the winter the cord is very stiff. So I decided to  install a charge port like the EV's have. I purchased a weatherproof socket to install in the side of the E1. Wired the charge cable to the socket and installed it.  So much easier now to plug the charge cord into the socket, and I have more room in the glove box.

On another note: Since I have owned the E1 I have noticed a rattle in the right front area but I never could locate it until last week when I had the E1 up in the air on a lift. When I grabbed the right front wheel it a play in it.  So I removed the wheel and torqued the nut on the drive shaft and the play is gone.  I am thinking when it was assembled the nut was just hand tightened and the cotter pin installed.  I also found that the left front nut was not tight either. Backs were OK.

I have had my E1 since late last summer and I have always noticed that the parking brake was weak or non existent. About a month or so after I purchased it I mentioned to the dealer that the parking brake did not function well. What I was expecting from the dealer, ' well bring it in and we will correct the issue.' What I got was the typical dealer response, "it may just need to be adjusted." No shit!  Well I finally decided to adjust it. A very simple process need only two 10mm wrenches.  Open the bed, remove the pin holding the bed  to the strut and move the bad out of the way. Right in front of the electric motor is a brake disk.  That is the parking brake. It has a small set of brake pads that are actuated by a lever attached to parking brake cable.  There are two 10 mm nuts on the shaft to moves the pads. Release the inner nut and hold it in place while screwing in the outer nut - that is really a bolt. After screwing it in about one turn, tighten the other nut.  Check the parking brake. If it is holding when activated, then you are good, but if not, then you may have to turn the bolt another turn. Do not turn to far or you will lock it up.

Mine and some others  that bought one from the same dealer came with a 2 inch adapter that fits OVER the Hisun receiver. I think Hisun left that off your unit. Dealer should provide you that adapter. 

I hope you get it sorted out.

We call our E1 the Mule, for our other side by side was a Kawasaki Mule! Our two wheeler with a handle that curves out, we call Dolly Parton!  A funny: You know what Moses used to part the Red Sea? ..... A sea saw!

Thank goodness we do not have really cold temps here.  If one battery is defective it affect your power output.  In an emergency there is something you can try. Remove the bad battery.  With the power off. connect the two battery cables from the removed battery.  If the other batteries are good and charged, you should have enough power to move the vehicle. I have never tried this but technically I think it would work. 

In the last year he has had three batteries replaced.

The local Hisun dealer has sold only four E1's in this area. Like me, they use them on their farm/ranch.  Chickens and cattle are big in this area of Arkansas. Part of the reason more are not sold here is Hisun is not pushing them in order to sell their gas models. Those who want them have to wait six to 10 weeks to get one.  The Hisun distributor in the USA is in north Texas and unlike most Texans they are not to customer friendly! I also have found the inability to purchase certain vehicles in the automotive world. Eighteen months ago I wanted to purchase a plug-in hybrid from Hyundai. I discovered they only sell on the east and west coast of the US.  Dealers can not even get them! So I ended up buying a Hyundai Ioniq hybrid. I have really enjoyed it, especially the mid 50's mpg. But if I could have bought the plug-in version I could have gone about 30+ miles on electricity, and most of my round trips from home are less than 30 miles.

There are a few SxS's that use newer technology, ie. lithium batteries, but they are really pricey. The gel batteries in the E1, even though very heavy, work well and are not as temperamental as the lithium.  The heavy batteries also give the E1 the ability to pull a heavy load without loosing traction.  For example, I got my Dixie Chopper lawn mower stuck in deep mud a while back. I was able to pull it out with the E1. 

Some of these battery issues may be due to the BMS (battery maintenance system). I own a hybrid vehicle and there is always talk on the forums about issues with the BMS. It seems like with electric vehicles the BMS is the brains of the electrical system. I wonder if the dealers that are servicing these electric units really understand what they are working on! 

Have a friend here with an E1 and he has had battery problems too. In his case I think the batteries set to long either at dealer or distributor without being charged.  These type of batteries need to have the charge kept up on them or they go bad. Hisun has replace several of them under warranty. My E1 was fresh out of the distributor and did not sit around at all.  I have had no issues. I charge it about every two weeks, but the charge level has never gone below one  notch of the gauge. I have never driven mine far. I use it only on my 18 acre place. I have a small mountain at the edge of my property and it has no issue navigating it. It is always parked under cover so it is not completely out in the elements. 

Battery voltage may not be the issue. The issue may be what the amps/wattage of each battery is under load. Have your dealer run a load test on each battery to see if they are up to spec. A battery can show its rated voltage but fail under load.  Today I was splitting logs in my pasture and pulled my log splitter  and a full load of split oak logs in the bed up a steep bank in 4wd and in low without any problems.

I am sorry you have had the issues list. I have a friend that has had an E1 for about a year and he had a battery issue since he brought it home.  They finally fixed it by replacing one faulty battery.  I have had mine just six + weeks and it has more power than I need. I have small mountain at the back of my place and it goes up it like a jack rabbit. Haven't gone through any heavy mud yet so no experience.

Yes there is a return spring inside the mechanism on the other  side of  the firewall. But  on my E1 it was not strong enough to return the pedal enough to activate a microswitch that  permits current to flow into a relay and then thus to the electric motor. A safety switch! I could have replaced the weak E1 spring, but this was much simpler.

I have an E1 and am happy with it. Very quiet. No gas, oil, filters, plugs, etc to worry about. I just plug it in once a week. I have installed a radio and an LED light bar.  It has more power than you will ever need.

Just in case you still have a problem with the back up noise. You can remove  the four screws that hold the switch cluster and pull it out. behind thee wiring is the buzzer. just disconnect the wires.

Do not know if any of you Hisun E1 owners have  had issues with the parking brake pedal  not returning completely, thus preventing you from moving forward or reverse.   I had this issue and even sometimes when going over rough road the parking brake pedal would move down far enough to shut off power.  Local  dealer said no one had complained about that issue and they had no fix.  So decided to correct it myself. I installed a return spring on the parking brake arm and it stopped the problem!

I just installed a 12" LED light bar on my Hisun EV. Wow a difference it makes at night!

With 2080 amps and 1200 watts of battery power backing up the 12 volt battery I do not think there is going to be a power issue with the led light strip. Remember this an EV!

I have a 15 amp plug-in inline fuse at the battery plus terminal and a 14 gauge wire running to the front behind the dash. I use that to power the radio and an LED light strip that is in shipment presently. I will mount the switch for the LED lights in the knock on the dash behind the steering wheel. I am mounting the 12" light bar on the front bumper, just in front of the grill. Are you aware there is an empty 12v. connection in the rear under the tailgate? It is powered when the lights are on. In the wiring diagram it shows to be  for a license plate lamp.