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Have you ever wished someone made a charger that had variable voltage, variable amperage, auto detect between 110v/240v, swappable charging connections, and was smaller and lighter than two 10 amp chargers? (Read more)
First i would like to thank @Seba for giving me the idea and sharing his knowledge without which I would not have thought of this project. Check out his thread first: Decided not to go this route after the news of adjustable chargers going rogue and killing several 16x wheels with 100v++ despite being set to 84v. Felt more comfortable using my tested and proven GT16 chargers which are decently fast and never get hot. You can use any charger for this mod, just install the right connectors for your adapter/meter. For those who might attempt this: Mains voltage is dangerous, even more so when combined with mislabelled chinese components. My GT16 pinouts were completely reversed despite what the sticker read, and the Lenovo plug was wired backwards from what is used on the KS-16x. CHECK ALL POLARITIES WITH A MULTIMETER! Do not recommend the first half of this project for the inexperienced DIYers. It's much more worth it safety wise to just buy a chargedoctor off ebay or a ready-made meter/adapter from a trustworthy source. So much could have gone wrong Parts used: Lenovo male cable for 16x https://s.click.aliexpress.com/e/SGpXCDJXH GX16-3 female socket for GT16 chargers https://s.click.aliexpress.com/e/dz4VdU8Rt Coulometer https://s.click.aliexpress.com/e/qh7dWjVcX GT16 Charger (or whatever you like) This setup gives me 3 options: 5.5a fast charge, 84v, 100% 2.7a slow charge, 82v, 90% 2.7a slow charge, 84v, 100% I forgot to document the assembly of my coulometer as the mislabelled markings were pissing me off and giving me a headache. The next part onwards is relatively safe and easy to attempt. The GT16 charger has only one tamper-resistant triangle screw hidden under a sticker Trimpot was hidden under a glob of silicone probably to prevent tampering as well. Peel it off carefully. The dial is fragile and can be yanked off easily. Keep a close eye on the meter and turn very slowly and gently until you reach your intended voltage. My charger only had one trimpot which makes things simpler. However, note that many chargers have 3 according to Seba. Check his thread to make sure you do not adjust the wrong one if you have one of those. 82.5v: close enough for me. Put everything back together and its done! Now I can charge to 90% - my daily use option, or 100% for balancing once a month, or fast charge at 5.5A which is always nice to have when in a hurry.
Just wanted to share another fast charging method I haven't seen posted. As I have multiple wheels (NB1 E+, KS-16S) as well as a ninebot mini-pro and an ebike. I was looking for a method that would work for all of them. Decided to purchase a Cycle Satiator (yes it's expensive but very versatile: http://www.ebikes.ca/product-info/cycle-satiator.html) and programed multiple fast 100% and 80% charge profiles it for each toy. Voltage is listed the original chargers for each and you just have to decide what amperage you want to charge it at. (up to 5A for the one I bought). I bought a packet of Anderson Connectors (https://www.amazon.com/dp/B005P9CATU/ref=pe_861660_138883610_fxm_4_0_n_id) and inserted them on each of the original chargers as pictured below. That way the original charger still works and you don't have to find these odd connectors for each toy. Not trying to plug the Cycle Satiator just figured you all might find the setup useful as another option to consider. I've read up on fast charging, but some if it goes over my head pretty quick (and I still have a few questions) so if anyone sees any issues please let me know. Cheers, A
The Charge Doctor with double input for IPS (Holtz, Zero...) is available. You can order it on the "Buy" page of my blog : http://hobby16.neowp.fr/buy/ I've also had questions about the IPS chargers, so I have posted a how-to mod a generic charger to make a customized charger with the right connector : http://hobby16.neowp.fr/2016/11/20/charger-customization/ The how-to is posted below as a backup : Charger customization Most e-wheels have settled for the GX16-3 connector. Some though use a different format and the corresponding charger may be difficult to find and are mostly more expensive. A customized charger with the right connector can be made from a generic 2A charger with the wiring instructions below. Various ewheel connectors, size and pin comparison Most frequently found connectors e-Wheel Socket Wiring Voltage Topo* Remark Most e-wheels GX16-3 1: V+ ; 3: 0V 67.2V 16S connector for Solowheel, Airwheel, Gotway, Firewheel, King Song… Gotway MSuper3 84V/1600Wh GX16-4 1: V+ ; 2: 0V 84V 20S other MSuper3 with battery <1600Wh have GX16-3 connectors IPS (Holtz, Zero…) GX16-4 2: V+ ; 4: 0V 67.2V 16S warning, same connector as above but different wiring! InMotion V8 ** GX12-3 1: V+ ; 2: 0V 84V 20S same connector & wiring as hoverboards InMotion V3,V5 Lenovo Int:V+ ; Ext: 0V 84V 20S Lenovo square socket, originally for Lenovo laptop power supply Ninebot One*** Lemo 63V 15S see photo for wiring*** Ninebot Minipro, Xiaomi ** GX12-4 1: V+ ; 4: 0V 63V 15S *16S = 16 LiIon cells connected in series, total voltage calculated using battery full value = 4.2V/cell ** important, the numbering order on GX16-3 connectors is totally different from the GX12-3 : from left to right 3-2-1 for GX16-3 compared to 1-3-2 for GX12-3 !!! Likewise for GX12-4 and GX16-4 GX12 and GX16 plugs, note the difference in pin numbering *** Wiring for Lemo on NinebotOne Beware of the charger For this mod, I recommand using the fanless 2A generic chargers. Even if they tend naturally to warm much more than a (noisy) charger with integrated fan, they have many great features: availability for various voltages, noiseless, compact and transportable… They allow fast charging at 4A by a parallel connection with the original charger using a Duo Charge Doctor (or even at 6A with the Triplex CD). Warning though, some 1.5A chargers are sold as 2A chargers. They have a smaller housing and are very hot when charging, thus unreliable in the long term. When buying it online, the vendor never details the housing dimensions and count on the buyers not to check the actual current to sell it. Without stated dimensions, the difference can still be made looking at the distance between the rectangle and the grooves (see arrows on the picture). Any vendor with such dubious practices should be avoided anyway. So don’t be misled, buy only the 2A charger with the bigger housing. Chargers 2A and 1.5A, size comparison