NinebotPTRELITE+ Posted October 16, 2018 Share Posted October 16, 2018 Had been searching for modestly priced rebuilt packs in the US with no success. Finally ended up doing a pack rebuild on my own. Found the exact OEM 18650 LG Cells out of Korea for $230USD for the 60 cells. Pure nickel stripping and cell holders cost another $30, but was able to reuse the original 15S2P BMS's which both reset nicely. I already had the spot welder. The "new" LG cells were from a 2016 mfg batch and equally charged at 3.7Volt give or take .04 I have been running the pack for six weeks now. Working like a new pack - of course it almost is new! Just here to say that rebuilding a Ninebot battery pack can be done by "carefully" following guidance found online and Youtube. Learn from other people's mistakes and successes. I did have someone standing by with fire extinguisher and I wore gloves, eye protection and full face shield while working with the packs. Spot welding batteries can go smoothly and easy until IT DOES NOT! I had no problems , but took my time and checked and double checked polarity, wiring positions, placement BEFORE every weld. I will rebuild all my packs from now on, but will try to maintain the same "sense of danger " as I did doing the first pack. 1 1 Quote Link to comment Share on other sites More sharing options...
zugu Posted October 16, 2018 Share Posted October 16, 2018 (edited) Great !!! Now you could be in business !!! When I'll need a battery relacement in the future, I'll first ask to you for a Rebuilt package Edited October 16, 2018 by zugu Quote Link to comment Share on other sites More sharing options...
NinebotPTRELITE+ Posted October 17, 2018 Author Share Posted October 17, 2018 HOW sweet! . I would be glad to offer pointers as needed when the time comes. I only risk losing body parts for my own projects 2 Quote Link to comment Share on other sites More sharing options...
FreeRide Posted October 20, 2018 Share Posted October 20, 2018 Do you know where to adjust the reported voltage or (over voltage signal) for the BMS? I have one that reports the incorrect voltage (too high), I'd like to adjust it. Quote Link to comment Share on other sites More sharing options...
NinebotPTRELITE+ Posted October 21, 2018 Author Share Posted October 21, 2018 Sorry, not that smart. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted June 15, 2019 Share Posted June 15, 2019 I have a ninebot elite+ and a standard model. The standard model has started to shut down to protect against a surge in battery 1, I'm guessing this is some faulty cells so will need a rebuild - not something i want to do but i use this for my business and I cannot get hold of a replacement (I did purchase a new elite+ battery from china but it does not work! - they said send it back and they will fix it, but the lithium battery is too powerful for any courier in the UK to accept). Do you know what cells are needed for the 450w battery? If i upgrade the cells to make an elite + battery can i use the same BMS or do i need to buy a new one? if so do you know what i need to purchase? please help - I'm getting a little desperate. Quote Link to comment Share on other sites More sharing options...
trevmar Posted June 19, 2019 Share Posted June 19, 2019 You want cells rated for high continuous current drain. The MiniPRO uses these two types:LG MF1 for the lower capacity batteries, and the better '320' miniPRO uses the LG MG1 series. In the USA they are between 3-4 dollars each. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted June 19, 2019 Share Posted June 19, 2019 Thanks Trevmar, I'm working with an elite which is using 18650 cells i know the plus uses 2900mah cells, i need to rebuild a lower capacity battery first as that is the one playing up, so i'll see what cells are used when i open it i guess. is there any way of checking the bms is working ok? Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted June 21, 2019 Share Posted June 21, 2019 Regarding the BMS - I have one battery that is completly dead, i don't know what has happened but i was hoping to salvage the BMS, is there a way to test them, or does anyone know if there is a replacement available? Quote Link to comment Share on other sites More sharing options...
NinebotPTRELITE+ Posted June 30, 2019 Author Share Posted June 30, 2019 (edited) I know that there is a Russian selling the BMS for the PTR Elite on ebay. Not too expensive if you know that yours is toast. Once you rebuild the pack (one side), attach the original BMS and give it a chance to reset. I had to connect and disconnect (power lead) three times before it reset from showing failure voltage (about 13 Volts) and reported 55Volts. For the 450 battery, Found the exact OEM 18650 LG Cells out of Korea for $230USD for the 60 cells. They are 2100Mah . Pure nickel stripping and cell holders cost another $30, but was able to reuse the original 15S2P BMS's which both reset nicely. I already had the spot welder. The "new" LG cells were from a 2016 mfg batch and equally charged at 3.7Volt give or take .04. Have been using pack for a little less than a year. Still takes full charge and balances if left charging until it shuts down on it's own.. Edited June 30, 2019 by NinebotPTRELITE+ Quote Link to comment Share on other sites More sharing options...
NinebotPTRELITE+ Posted June 30, 2019 Author Share Posted June 30, 2019 There is a BMS on each side of the dual pack. 30 batteries each side Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted July 2, 2019 Share Posted July 2, 2019 On 6/30/2019 at 4:55 AM, NinebotPTRELITE+ said: I know that there is a Russian selling the BMS for the PTR Elite on ebay. Do you have a link? I'm getting desperate for a new battery or battery rebuild and not getting anywhere fast! - on foot or via a ninebot (sorry couldn't resist) Quote Link to comment Share on other sites More sharing options...
NinebotPTRELITE+ Posted July 3, 2019 Author Share Posted July 3, 2019 https://www.ebay.com/itm/Ninebot-BMS/332785626857?hash=item4d7b91aee9:g:O2wAAOSwj2Ra-mkE Shows he has at least 10. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted July 3, 2019 Share Posted July 3, 2019 It states it is the same BMS for elite and elite+, are they interchangeable? I have a few BMS's from different batteries, so hoping not to spend the money unless necessary. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted July 4, 2019 Share Posted July 4, 2019 what is the nickel stripping you use for the weld, it makes the job look really neat and professional, all i can find is basic nickel ribbon or the ladder style stuff. i would like to use what you have used as it has the tabs needed as well - is there a link, or what do i need to search for? On 10/16/2018 at 9:28 PM, NinebotPTRELITE+ said: Pure nickel stripping 1 Quote Link to comment Share on other sites More sharing options...
NinebotPTRELITE+ Posted July 8, 2019 Author Share Posted July 8, 2019 Fold them on eBay (US SIte) . Just search for pure nickle stripping. I used the ladder style and trimmed as needed 1 Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted July 17, 2019 Share Posted July 17, 2019 So the battery i opened up had clearly already been rebuilt using cheap unbranded cells. so I need to source correct replacement cells for a ninebot elite and an elite+ (i have one of each). samsung 25r's are pretty easy to source here in the UK, will they work? - 18650/2500mAh/20A INRs what mah do i need and what other ratings etc to be aware of to get the correct cells. 1 Quote Link to comment Share on other sites More sharing options...
FreeRide Posted July 17, 2019 Share Posted July 17, 2019 4 hours ago, Baba Yaga said: So the battery i opened up had clearly already been rebuilt using cheap unbranded cells. so I need to source correct replacement cells for a ninebot elite and an elite+ (i have one of each). samsung 25r's are pretty easy to source here in the UK, will they work? - 18650/2500mAh/20A INRs what mah do i need and what other ratings etc to be aware of to get the correct cells. DO you have pictures? Why do you say cheap cells? When they make battery packs they buy cells in bulk they may not have branding on them. Sometimes it is hard to find the codes. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted July 18, 2019 Share Posted July 18, 2019 Sorry the cheap cells bit is irrelevant info - I purchased an old broken elite to harvest the BMS, have a look at battery build and harvest some other parts. The machine was not at all functional and had a few mismatched bits - so i assume it had been rebuilt. The cells were 2000mah so rather than try and harvest them for a rebuild i would like to buy new cells - and make sure they are the correct ones. For your interest though, i have attached a pic of one of the cells. I still need to know what cells i need for the an elite battery and elite+ battery rebuild. 1 Quote Link to comment Share on other sites More sharing options...
FreeRide Posted July 18, 2019 Share Posted July 18, 2019 6 hours ago, Baba Yaga said: Sorry the cheap cells bit is irrelevant info - I purchased an old broken elite to harvest the BMS, have a look at battery build and harvest some other parts. The machine was not at all functional and had a few mismatched bits - so i assume it had been rebuilt. The cells were 2000mah so rather than try and harvest them for a rebuild i would like to buy new cells - and make sure they are the correct ones. For your interest though, i have attached a pic of one of the cells. I still need to know what cells i need for the an elite battery and elite+ battery rebuild. ... Thanks for the pic, I'm sure any cell that can sustain a 10A discharge would work fine. What cells you need depends on what capacity you want as long as it can support the current requirements. I don't know why the design calls for, but I'm pretty sure it would be 10A or under given typical batteries. One well known ebay seller for this was using the HG2 (a very fine cell for this), but that 25R would be very good also as long as you would be happy with the overall capacity. A 450Wh pack would require roughly 2Ah cells, and and 620Wh pack 2.8Ah cells. The is roughly, and you can't generally use the full capacity, so using 3Ah cells will get you a usable capacity close to the spec'ed capacity. You probably already know this, so I'm not sure if you are looking for the exact cell Ninebot uses (which may have varied), or you just need to know what the minimum max-discharge rate for the cell should be. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted October 20, 2019 Share Posted October 20, 2019 Still tinkering with my battery - mainly out of fear before i get welding but I was looking at the BMS when i came across this on ebay. If my BMS is not working (Hypothetically) could i replace with one of there? I'm only curios, but might need this down the line. Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted November 19, 2019 Share Posted November 19, 2019 Ok a few questions here - any advice gratefully recieved. I got two faulty elite battery packs - one high capacity, one standard. on both packs one side has gone down so for a quick fix, could i use the good side from the high capacity and the good side from standard together as one complete pack? I don't go long distnaces as these are used in performance - would this work or am i walking into disaster?? second Q - i was about to rebuilt the faulty pack but did a quick vault test first - the pairs of cells read as expected intervals of 4v all the way up to 60v, but across the terminals I'm reading 15v? is this a faulty BMS or if not any theories?v Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted November 19, 2019 Share Posted November 19, 2019 here are my readings across the cells vs across the terminals plus the error reports on the two seperate batteries (one large capacity the other standard). Quote Link to comment Share on other sites More sharing options...
Chriull Posted November 19, 2019 Share Posted November 19, 2019 27 minutes ago, Baba Yaga said: second Q - i was about to rebuilt the faulty pack but did a quick vault test first - the pairs of cells read as expected intervals of 4v all the way up to 60v, but across the terminals I'm reading 15v? is this a faulty BMS or if not any theories?v If the ouput protection (i.e. overcurrent/short circuit protection) is active, the output mosfets are disconecting. So one has a high ohmic voltage divider. If your voltmeter has for instance 10 MOhm resistance, the battery pack has 60V the turned off mosfets have an resistance of 10MOhm/15V*(60V-15V)=30MOhm. Normaly this overcurrent/short circuit protection gets reset if one dis- and then reconnects the pack to the mainboard or if on plugs in the charger. If this output protection cannot be reset, the BMS could be a faulty, too. Maybe it has to be connected to the mainboard to get activated again? Quote Link to comment Share on other sites More sharing options...
Baba Yaga Posted November 19, 2019 Share Posted November 19, 2019 Thanks Chriull, I have had this battery in and out of the ninebot several times, as it was working immediatly after charge then after a short while giving me the warning, so i presumed a few cells had gone but it is strange that it is reading ok across the cells but not the terminals. Do i need to reset the BMS to test it? if so do i remove the bms white plugs connecting small white wires to the cells or unsolder the main red black charge/discharge leads? Quote Link to comment Share on other sites More sharing options...
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