# Green LiFePo4 28s Gem **URL:** \ **Category:** Uncategorized\ **Created:** [June 21, 2019, 8:35pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374 "2019-06-21T20:35:23Z")\ **Posts on this page:** 20\ **Page:** 3
**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:** [July 18, 2019, 8:33pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/41 "2019-07-18T20:33:12Z")
Yes, spoof is on the way in an envelope. Look for a 2 wire 100v meter on eBay. \<$20 Don’t run below 3v/cell. 84v for 28s. Leds will tell you if near over charge. Meter the ones that are lit. 3.7v is max. Turn off charger if a cell goes high. ---
**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:** [July 18, 2019, 8:58pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/42 "2019-07-18T20:58:02Z")
> **[3PCS DC 5-120V Mini Voltmeter Blue LED Panel 2-wire Volt Meter 3-Digital...](https://www.ebay.com/itm/3PCS-DC-5-120V-Mini-Voltmeter-Blue-LED-Panel-2-wire-Volt-Meter-3-Digital-Display/131890219021?ssPageName=STRK%253AMEBIDX%253AIT&_trksid=p2057872.m2749.l2649)** > > Display: Three 0.56 "digital tube. Display Color: BLUE. Input impedance: About 100K. ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [July 18, 2019, 8:58pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/43 "2019-07-18T20:58:48Z")
thanks - will look on eBay for that. As for installation and maintenance - any suggestion for pointers I should know about before I get into this? And thanks - your help has been awesome, and really fired up to get this going for my family. Stewart ---
**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:** [July 18, 2019, 9:05pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/44 "2019-07-18T21:05:10Z")
Don’t charge below freezing. Do not let a cell go over 3.7v, or much under 3v. Cell is empty at 3v so stop driving. Cell is full at 3.5. Don’t limp it home. No damage until under 2.8v. Store at any state of charge. Short charge cycles are fine. ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [July 18, 2019, 9:49pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/45 "2019-07-18T21:49:53Z")
In LA, hopefully the freezing won’t be too much of an issue! Assume I just bolt the balancing circuits back on each cell? One last thing - two of the boxes with batteries in them showed up wet on parts of the outside - when I open them, they are damp inside and inside the bags - not sure of this was protective oil, if they got damp from something outside the boxes or if something in the batteries leaked - but wanted to check if it was anything to be concerned about? Stewart ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [July 18, 2019, 9:56pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/46 "2019-07-18T21:56:23Z")
On closer inspection, there is definitely some type of slippery oil-type liquid on the cells in two of the boxes…not sure of they leaked or if this is something else. ---
**Author:** ![RS\_E6](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/rs_e6/32/12308_2.png) [@RS\_E6](https://community.electricforum.com/u/RS_E6)\ **Post date:** [July 18, 2019, 9:58pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/47 "2019-07-18T21:58:51Z")
Not a cause for concern. The cells were stored in the oil. What your seeing is residual. Dave said if the cell was actually compromised it would have a distinct smell. I’ve just wiped my cells down (a few times). ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [July 18, 2019, 10:00pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/48 "2019-07-18T22:00:30Z")
Thanks for the input RS\_E6 - I was getting a little concerned there! ---
**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:** [July 18, 2019, 11:01pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/49 "2019-07-18T23:01:05Z")
They were stored submerged in mineral oil. It never goes away, but it’s harmless. ---
**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:** [July 18, 2019, 11:03pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/50 "2019-07-18T23:03:35Z")
> [@StewartM](#): > > Assume I just bolt the balancing circuits back on each cell? Watch the polarity. Marked + and -. Led lights when connected. Check first nut for tightness, then add board with a second not. I thought it wise to remove for safe shipping. ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [July 24, 2019, 6:13pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/51 "2019-07-24T18:13:01Z")
Dave, Hope all is well. Sorry for the delay in reaching out, but I had an unexpected hospital stay thrown in there for a few days, but happily I am a free man again. I got out, and the Spoof wire was here - so wanted to let you know I got it and thanks for sending. One question - how is that meant to be installed? Realize it is a simple install, just trying to figure out what I mam meant to do with it! Stewart ---
**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:** [July 24, 2019, 7:16pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/52 "2019-07-24T19:16:42Z")
The spoof allows the car to start when over 86 volts. Repin #1 wire in 23p connector. Spoof replaces #1, and the removed lead plugs into the free end. Power off first! ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [August 16, 2019, 1:06am UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/53 "2019-08-16T01:06:07Z")
Dave, Sorry to bother you - finally getting around to getting the batteries and chargers I bought from you installed. I had a cardiac event, soit put me behind schedule on it, and I have had to have the person who originally built my cart do the installation - he is a very good builder etc. He has everything installed, new charger, batteries, spoof (he had to soder it in line for some reason on the #1 wire) and everything seems to be charged up - but he has an issue - when he unplugs the cord for charging, the cart still shows the charging symbol, and thus won’t move anywhere? I am sure this is something simple (sounds like it might be related to the spoof?), but was hoping you could give him a quick call while he is working on it - his name is Mike (310) 427-4687. Alternatively, feel free to call me - (415) 203-5383 if you are not comfortable talking to him, although he is the one doing the build… Thanks again, and sorry to bug you on this - almost there. I owe you drinks of you are ever in LA. Stewart ---
**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:** [August 16, 2019, 1:15am UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/54 "2019-08-16T01:15:28Z")
That should be a simple one. You need to bypass the charger interlock if it’s not connected. Newer t4 gems need 72v on the green wire from charger. Older zivan and some DQ use a relay, and the two interlock wires from Gem need to be tied together. ---
**Author:** ![RS\_E6](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/rs_e6/32/12308_2.png) [@RS\_E6](https://community.electricforum.com/u/RS_E6)\ **Post date:** [August 16, 2019, 10:47am UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/55 "2019-08-16T10:47:39Z")
@StewartM, good to hear you’re feeling better. What year is your GEM? ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [August 16, 2019, 10:13pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/56 "2019-08-16T22:13:51Z")
Dave, GEM is a 2008, but I believe the builder upgraded a bunch of components on it, and think it has a newer controller, bigger motor etc. More importantly, really appreciate you taking the time to call the guys yesterday - got it all sorted out, and it is now running like a champ! Faster, doesn’t slow down / bog on the uphills, lighter, etc. All round couldn’t recommend this and your batteries enough - and couldn’t ask for a better experience and help than you provided. BTW - the guy who built my cart and builds them for a bunch of people in town, took it for a test drive, then immediately phoned me up and said he is definitely doing this to his cart ASAP - if that is not a recommendation, then I don’t know what is! Will post some pics of the installed batteries this weekend in case it is of help to anyone else looking to do this. Stewart ---
**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:** [August 16, 2019, 10:25pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/57 "2019-08-16T22:25:25Z")
What did he do about over voltage code 16? Was the spoof backwards? He never called back. As I recall, you have 28s green batteries, that I test charged with the balance boards. If anyone else wants to copy this, I have one set on the shelf. After that I will need a couple weeks notice. This should make a trouble free system. Watch the leds on the top. At the end of charge cycle some will illuminate showing they are full. If one comes on way early best monitor it. A weak cell will drain to low and fill too fast. ---
**Author:** ![StewartM](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@StewartM](https://community.electricforum.com/u/StewartM)\ **Post date:** [August 17, 2019, 1:19am UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/58 "2019-08-17T01:19:41Z")
In honesty, I have no idea what he did to clear that code 16, but whatever he did, it seems to be running like a charm so far. Tried it out on a pretty big hill that used to crush my cart with the lead acids in it, and with the 28 LifePo4 cells the cart did not slow down at all…not one single bit. So far - awesome. Stewart ---
**Author:** ![BadBrad](https://avatars.discourse-cdn.com/v4/letter/b/e47774/32.png) [@BadBrad](https://community.electricforum.com/u/BadBrad)\ **Post date:** [September 26, 2019, 5:24pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/59 "2019-09-26T17:24:02Z")
Inwo, What amp rating are your batteries? Are they 60 or 80? The ones you sold in this thread? Thanks. ---
**Author:** ![RS\_E6](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/rs_e6/32/12308_2.png) [@RS\_E6](https://community.electricforum.com/u/RS_E6)\ **Post date:** [September 26, 2019, 6:01pm UTC](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374/60 "2019-09-26T18:01:28Z")
Data sheet says 60 but I believe they typically test out over 70. ![international%20specs](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/f/fa69fb30087398534dbaa12f250e652150747336.gif) [Previous page](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374.md?page=2) [Next page](https://community.electricforum.com/t/green-lifepo4-28s-gem/16374.md?page=4)