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OK, good to know if I have any issues... thanks!

Funny, I never realized that the actual values are a 10x factor! Yes, it was reading around 300 amps; wow, that's a lot of current! Well, despite it showing 300a for 20 seconds or so, there were no errors. Aside from the difference in batteries, I'm wondering what gauge wire BuggyBoy used, as that can also be current limiting, but not sure if that would have contributed to triggering an error.

Thanks for that info! In my limited testing so far, I did go up a fairly steep hill that took about 20 seconds from bottom to top (which was a few seconds faster than with the AGM batteries), and did not have any errors in that case. The original onboard current gauge was only showing a 30-35 amp draw, but not sure if that gauge is accurate with the lithium batteries. The LiTime gauge does show amp draw, but it was very small and hard to see as I was climbing the hill; I'll try that again one day. Most of the the use for the cart is on my property, which has some mild, but not steep hills, so hopefully this will not be a problem! I hope not, as I would rather not spend the additional $ on more batteries, but that will be be determined.

After three years, my Sector completely died. Something caused the hot wire under the seat from the charger to disintegrate, so the batteries weren't being charged. The batteries weren't charging 100% anymore, so decided to convert to lithium. As most others have done, I went with 4-48v batteries in parallel, as I believe that will be plenty of amp-hours for my needs, but can always add more if needed. I went with LiTime wired CAN batteries and mounted their digital gauge on the dash above the current one, which fit perfectly. I didn't think the existing battery brackets worked well for the new batteries, so made my own out of aluminum L rails, which makes it much more secure (and saves a few more ounces :)). Since I wired them in a 'balanced' configuration, I had to make all new cables from 0/1 gauge wire and 8mm posts. I updated the DeltaQ charger to profile 233. Cleaned everything up (I must have vacuumed 20 pounds of dirt!), put it all together and... wham! So far, it definitely is better than with the original AGM batteries. Sustains speed better going up hills, and seems to have plenty of reserve current. The difference in weight with 4 LiPo vs 8 AGM batteries surely doesn't hurt! Thanks to everyone on this forum, but special shoutout to GNFO who was a big help. A few questions: In the 'any tips' thread, EVSupport mentioned reprogramming the Sevcon to reflect the new discharge curve of the lithium cells, but I didn't see any more info about that or how to do that. Is there any more info about that? Have folks replaced the onboard 12v battery, and if so, with lithium? I'm not sure why there is a 12v battery; why didn't they just step down the current of the 48v system to provide power to accessories? Is there a recommendation as far as charging with the lithium conversion? As far as I understand, it is better to let lithium batteries discharge somewhat (but not completely) than keep them charging all the time. What do you think?

Updated profile, burned wire replaced, first battery connected, CAN port connected to digital LCD screen; everything looks good so far. Glad that onboard charger didn't appear to burn out due to whatever caused the burned wire.

Thanks! I already updated the profile, and will connect one battery and see if charges.

I got all the batteries and supplies, removed the rest of the old batteries, cleaned every out (unbelievable amount of dirt, gravel, leaves, etc.!) and ready to start installing. A few questions: The LiTime batteries came with very little charge. LiTime recommends charging each battery individually before connecting together. The only 48v charger I have is the onboard Delta, so thought I'd connect one battery at a time and charge that way. Any thoughts on this? There are 4 loose wires and one loose connector going to the battery compartment (see photos). The white and black are connected together and go to battery ground. The red looked like (before it burned and cut) that it went to battery positive. Am I assuming that these wires make up the DC charging current from the charger? I have no idea where that 6 pin loose plastic connector goes to (see picture). Can someone shed some light on that? I noticed that there are a couple of open male connectors on the Sevcon (see picture). Both yellow and red wires are connected to their respective terminals below them, but not connected together. Is it possible that that floating green wire connects to one of those? The female connector on the green wire is the right size for those terminals. Thanks!

Thanks for the info. I couldn't find info on the 'charge interlock' other than what GNFO mentioned above; should I assume that we don't have one in the U.S. and that green wire just floats and not connected to anything? I did just receive the batteries, cable, and yes, crimp connectors! I'll get everything in and connected next week, update the Delta algorithm, and hopefully everything will work and the charger is not damaged. If it is, then have to get a replacement.

I decided to go with 4 LiTime CAN RS485 batteries along with the RS485 display, which I'll mount on the dash. I agree about the reliability of the hard wired connection, and not needing to look at my phone for battery status. I also have a landscape guy that uses the Sector, so it will be helpful having the display on the dash for him to monitor. Now I just need to get some heavy gauge cable and connectors (I believe the posts are 8mm) to get everything connected. Much appreciate all the help!

OK, thanks. My property is 17 acres, but I never got below 80% charge with the AGM batteries, so probably 4 Lithium batteries will be fine. As you mentioned, I can always add more if I find 4 doesn't cut it. One other question: Is it better to go with bluetooth or CAN wired option? The wired option will need an external display to monitor levels, where the bluetooth version doesn't, but do the batteries communicate with each other through these interfaces?

Thanks. Getting back to this. One thing I'm wondering is weather to go with 4 or 6 48v batteries. I don't think I'll necessarily need the range from 6 batteries, but thought once I'm in there...

Thanks. It does look quite easy to upload a new algorithm onto the Delta charger. I need to understand move about CANbus and how to set that up, but will research that. I'm not sure I want to spend that much for something like the ReLion batteries, but there are some fairly reputable companies like LiTime that sell similar batteries for much less, but probably not at the same level as ReLion. Thanks again for all the help! P.S. I do wish I understood what that green wire is for! I hate to have that just floating in there.

Thank you! This it? I see it's a Delta, but don't see a model #.

Thanks so much for all the really useful info! Would it be possible to get the files and instructions to flash the Delta charger? I don't minding making some effort to convert to lithium, but I have other projects I'm working on, and at the moment, don't feel like starting to change out the charger, and the work that would entail. If I can do the conversion without too many extra hours as compared to just swapping out the existing batteries for another set of AGM, then maybe I'll that.

Thanks so much for the response! Looking again, it looks like the red wire was attached to a positive post of one of the batteries. Like you, the green wire has a connector, but I couldn't find any fitting that it was connected to! Green color often means ground, so thought it should be somewhere to the chassis or battery negative terminal, but could not find anywhere where it was connected to. I tried to charge one of the batteries with a 6v 5a Battery Tender charger I have, but it never indicated a full charge, so thinking I should get new batteries. I didn't realize that the charging algorithm can be changed on the on-board charger: how is that done? When you changed to lithium, how many batteries are you using? I saw one video where someone is using two 48v lithium batteries in parallel, which may actually be less money than buying 8 6v AGP batteries, so maybe that makes more sense. The one issue with lithium, is that they shouldn't be connected to the charger all the time like you can with wet-cell batteries, so need to be mindful of only charging when they are fairly discharged.

I purchased my Hisun Sector E1 three years ago. I think there are a few hundred miles on it, and lots of charging. A couple of weeks ago it started sputtering a lot, not charging fully, and discharging fast. I took a look at the battery compartment under the seat, and noticed this (picture below) which certainly explains a lot! Questions: 1) Where are those disconnected and corroded wires suppose to go? 2) I took out half the batteries thinking they might be in bad shape, but measured 5.4v on all of them, which doesn't seem bad considering they probably haven't been charging for a while. Do you think I should replace them all at this point (after three years), or just fix the wiring (although I'm not sure what caused that to happen), or they may still be perfectly good? I certainly don't want to put them all back (as I mentioned I removed four out of the eight only to have to remove them again if they are not in great shape. 3) If I do replace them, I noticed there are much cheaper options on Amazon for AGM 6v batteries (Weize GC2 is one option) that are the same size and slightly higher AH than the original Discovery ones. Any thoughts about going with these? I know a lot of folks replaced the AGM with lithuim, but not sure I want to go through the hassle of also replacing the onboard charger, etc. I fine with AGM and getting a few years out of them. Thanks!