# New GEM Lithuim progress **URL:** \ **Category:** GEM Forum\ **Created:** [December 27, 2016, 1:18am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818 "2016-12-27T01:18:40Z")\ **Posts on this page:** 20\ **Page:** 6
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [February 28, 2017, 11:15pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/103 "2017-02-28T23:15:57Z")
> [@LithiumGods](#): > > that’s not bad . hit them with another full charge and check voltage 2-10 hrs after shut off then report I’m draining the batteries, on the GEM, down right now so I can move it out of the shop. I’ll plug it back in and monitor the cell voltages like you suggest. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 1, 2017, 12:41am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/104 "2017-03-01T00:41:26Z")
6.8volt spoof is in the mail. See if it gets above 92.4v. (new hvc) Oops, it better not with 22s. 🙂 ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [March 1, 2017, 2:24am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/105 "2017-03-01T02:24:59Z")
I charged it back up again tonight and baby set it all the way. The highest voltage that I saw was 89.80. I also noticed that when it got to 88.2 the fan slowed down. That used to be when the LED went from red to yellow on the old algorithm. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 1, 2017, 2:53am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/106 "2017-03-01T02:53:20Z")
That should be just right for 22s. The 6.8v spoof should work too. Looks like your good to go. If the cells are all pretty close it should be safe to use without checking every time. ---
**Author:** ![Troyin909](https://avatars.discourse-cdn.com/v4/letter/t/57b2e6/32.png) [@Troyin909](https://community.electricforum.com/u/Troyin909)\ **Post date:** [March 1, 2017, 3:02am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/107 "2017-03-01T03:02:33Z")
My charger that Dave sent me stops at about 83v every time so far and my pack has been. 82.9-83v and even at every module so far. Troy Hoggard’s iPhone ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 1, 2017, 3:22am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/108 "2017-03-01T03:22:50Z")
That’s 4.15 per cell in your configuration, which is full up. Mike suggest a little lower for long life. No problem, I do 4.2 sometimes. You can do that by changing profile, or better yet, just set to 4.1 in BMS-24. ps. Get me the picture and I’ll help with the bms wires. I think Todd has the same. just 22s instead of 20s. He may have some tips. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 1, 2017, 3:29am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/109 "2017-03-01T03:29:05Z")
I drew this for a customer. Helpful? ![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/1X/a9910e62bd112072fea7aa588a719e31f50bae91.png) ---
**Author:** ![Troyin909](https://avatars.discourse-cdn.com/v4/letter/t/57b2e6/32.png) [@Troyin909](https://community.electricforum.com/u/Troyin909)\ **Post date:** [March 1, 2017, 3:59am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/110 "2017-03-01T03:59:22Z")
Not a lot for a newbie but I got something from jeff. I’ll send it ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 1, 2017, 4:39am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/111 "2017-03-01T04:39:10Z")
Yes, they are the ones I was looking for. Post them for Todd. ---
**Author:** ![Troyin909](https://avatars.discourse-cdn.com/v4/letter/t/57b2e6/32.png) [@Troyin909](https://community.electricforum.com/u/Troyin909)\ **Post date:** [March 1, 2017, 4:56am UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/112 "2017-03-01T04:56:35Z")
![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/1X/4e155152c8f7fdf87fcc123a5f328e10296ce5aa.PNG) ![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/1X/e1ef626a5c41bad742ac1c763c1efb0266a686bf.PNG) Thanks to Jeff for doing the work to get these. Nakedwaterskier👍🏾 ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [March 1, 2017, 1:48pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/113 "2017-03-01T13:48:00Z")
> [@Todd](#): > > that’s not bad . hit them with another full charge and check voltage 2-10 hrs after shut off then report > > I’m draining the batteries, on the GEM, down right now so I can move it out of the shop. I’ll plug it back in and monitor the cell voltages like you suggest. 11 hours after the charger shut off my individual voltages are between 4.046 and 4.057. The 4.046 is kinda down there by itself, the next closest is 4.050. Thanks to all involve for posting the wiring diagrams. Since my charger doesn’t have an enable circuit will I need two relays to be able to control it with the BMS? ---
**Author:** ![LithiumGods](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/lithiumgods/32/672_2.png) [@LithiumGods](https://community.electricforum.com/u/LithiumGods)\ **Post date:** [March 1, 2017, 2:11pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/114 "2017-03-01T14:11:25Z")
Todd , don’t worry to much about those low variances . your talking 1/100th of a volt . I’ve been running my leaf cells for 2 years and some are about 1/100th apart . since your not pushing them to their limits it does not matter . you well find that they are farther apart at a low charge . It takes a very very small amount of power to change cell voltage on the lower end , so again don’t worry about it . as long as you keep them above 3.0 and mostly below 4.1 they well be very happy . Also remember they prefer not to be stored at full charge . if your not going to be using the cart keep the cells in the 3.5 to 3.8 range . when I travel for a few months I set them to there and disconnect the main switch , they hardly change voltage at all. And you don’t have to recharge them after each use , if you do a lot of short trips just recharge them when they get low ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [March 1, 2017, 2:26pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/115 "2017-03-01T14:26:01Z")
I read in one of the forums that 10 Leaf modules won’t fit up front in a 2 seater. Here’s how I put 11 up front. ![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/1X/b486f9c44a357c00dc412f9cc1c96aefd23aeb25.JPG) ![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/1X/d1ee4d7dcf4b5ff0322d8b11cf7bfe08e8d18770.JPG) ---
**Author:** ![Troyin909](https://avatars.discourse-cdn.com/v4/letter/t/57b2e6/32.png) [@Troyin909](https://community.electricforum.com/u/Troyin909)\ **Post date:** [March 1, 2017, 3:32pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/116 "2017-03-01T15:32:36Z")
Looks good to me! I like it. ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [March 2, 2017, 3:11pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/117 "2017-03-02T15:11:06Z")
So I left the lights on most of the day yesterday to try to drain the battery down below 86 V, it got down to about 87.8, so I left the lights on all night. When I went out to the shop this morning Sounded like some relay was clicking away And it was at 56.7 V. ---
**Author:** ![LithiumGods](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/lithiumgods/32/672_2.png) [@LithiumGods](https://community.electricforum.com/u/LithiumGods)\ **Post date:** [March 2, 2017, 3:42pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/118 "2017-03-02T15:42:01Z")
get those charged above 3.0v/cell asap. but I doubt it well hurt them at that level ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [March 2, 2017, 3:52pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/119 "2017-03-02T15:52:12Z")
> [@LithiumGods](#): > > get those charged above 3.0v/cell asap. but I doubt it well hurt them at that level I’m already in the process, but what caused them to discharge that fast? With just headlights. ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [March 15, 2017, 10:54pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/120 "2017-03-15T22:54:43Z")
CALCS/NUMBERS CHECK PLEASE 2002 Gem Car with Zivan Charger OEM BMS 24 [Chargery.com](http://Chargery.com) Battery Chemistry Lithium with lithium-manganese-oxide nickel oxide Cathode Each Cell is rated at 32.5Ah 20 times 32.5 Ah = 650 Ah Max. Cell Voltage 4.2V times 20 = 84V Nominal Cell Voltage 3.75V times 20 = 75V 20 Cells x 500W = 10 kWh USE ONLY 80% OF CAPACITY TO PRESERVE CYCLE LIFE SO MAX DESIRED CELL VOLTAGE: 4V times 20 = 80V CUT THAT TO 78V TO BE COMPATIBLE WITH GEM SYSTEM MAX CELL VOLTAGE 3.9V times 20 = 78V MIN CELL VOLTAGE 3.0V times 20 = 60V ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [March 15, 2017, 11:16pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/121 "2017-03-15T23:16:31Z")
The Nissan Leaf battery pack is made of 192 Lithium-Ion (LiMnO2) cells, in a 96s2p configuration. Each cell is 32.5Ah @ 3.75V nominal, (3.2V - 4.2V). Four cells per module in a 2s2p configuration. And with 48 modules in the pack, this results in a 65Ah @ 360V. SO AMP HOURS ARE WRONG ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [March 15, 2017, 11:44pm UTC](https://community.electricforum.com/t/new-gem-lithuim-progress/11818/122 "2017-03-15T23:44:15Z")
2002 Gem Car with Zivan Charger OEM BMS 24 [Chargery.com](http://Chargery.com) Battery Chemistry Lithium with lithium-manganese-oxide nickel oxide Cathode from 2013 Nissan Leaf Each Cell is rated at 32.5Ah Max. Cell Voltage 4.2V times 20 = 84V Nominal Cell Voltage 3.75V times 20 = 75V 20 Cells x 500W = 10 kWh USE ONLY 80% OF CAPACITY TO PRESERVE CYCLE LIFE SO MAX DESIRED CELL VOLTAGE: 4V times 20 = 80V CUT THAT TO 78V TO BE COMPATIBLE WITH GEM SYSTEM MAX CELL VOLTAGE 3.9V times 20 = 78V ## MIN CELL VOLTAGE 3.0V times 20 = 60V The Nissan Leaf battery pack is made of 192 Lithium-Ion (LiMnO2) cells, in a 96s2p configuration. Each cell is 32.5Ah @ 3.75V nominal, (3.2V - 4.2V). Four cells per module in a 2s2p configuration. And with 48 modules in the pack, this results in a 65Ah @ 360V. I am using 20. [Previous page](https://community.electricforum.com/t/new-gem-lithuim-progress/11818.md?page=5) [Next page](https://community.electricforum.com/t/new-gem-lithuim-progress/11818.md?page=7)