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  1. O

    How long should a new pack keep full voltage?

    The way this thread ends is not the way it began. Originally I thought there was a problem with the battery, and the thread title and my first 2 or 3 posts reflect that. Since starting this thread I have determined that the charger is not putting out full voltage, so the pack is not getting...
  2. O

    How long should a new pack keep full voltage?

    Hmmm, i thought i addressed that issue above but one of my posts seems to have disappeared. Yes, as I said above, the charger drains the pack the longer it is left on. After 10 hours it drains the pack voltage to 57.8, or possibly 57.3. At this point I may have still been trusting the...
  3. O

    How long should a new pack keep full voltage?

    So i found another problem. The built-in meter displays higher than actual voltage. Charger display reads 58.8 but my dvm says 58.3. Battery displays 58.7 at full but dvm says 58.4. My dvm is tits on, it reads full voltage on 3 other chargers i have. That makes 3 problems with this...
  4. O

    How long should a new pack keep full voltage?

    It doesn't sit, i've been using it. For about 6 weeks now, around 20 charge cycles. I don't let it sit fully charged. I have 3 cheaper packs from less-praised vendors that are older and holding more voltage than this one. I was hoping people would chime in with facts like "my pack holds...
  5. O

    How long should a new pack keep full voltage?

    Charger is putting out 58.9 resting and pushes hard up to 58.8, holds it for a while, then drops off. Once "the light goes green" it does not kick back on so there is no trickle or balance mode. Kinda sucks as i paid more for the most advanced charger that goes with the pack. I will try dan's...
  6. O

    How long should a new pack keep full voltage?

    25r and the bms is supposed to be top notch.
  7. O

    How long should a new pack keep full voltage?

    I have a pack under 2 months old it has lost .6 of a volt. 14s4p under 20 charge cycles on it, once the charger shuts down the voltage drops to 58.2. If i leave the charger on overnight it drops even more, a 10 hour charge drops it to 57.8. I'm losing a full volt on a brand new pack. The...
  8. O

    4 dead cells. options? 18650

    thanks i will look into that. cheaper than buying a spot welder and i'd be adding 4 new cells either way, so maybe the same results....
  9. O

    4 dead cells. options? 18650

    So i've given up on the idea of boosting them back from 0. They've been asleep too long and i'd have to cut them out of the pack for safety. I was trying to avoid cutting the pack open because I don't have a spot welder. Has anyone repaired a bottle battery before? It looks like the cells...
  10. O

    4 dead cells. options? 18650

    Here is what i got from the vendor. "Could you please use a cell phone charger to charge each cell to 3.7V then the bms can balance them." Here is what i found at bu. "Do not boost lithium-based batteries back to life that have dwelled below 1.5V/cell for a week or longer. Copper shunts may...
  11. O

    4 dead cells. options? 18650

    Here are some pics Samsung 26f Bad bms New bms charging the pack 4 dead cells are above the blue exacto knife. Easy to get to at the end of the pack. View from the other side. The main discharge leads are connected to the dead string, fwiw.
  12. O

    4 dead cells. options? 18650

    10s4p samsung 26f bottle battery has 1 string of 4 dead cells. The bms was crushed in one corner and quit feeding that group of 4. I replaced the bms, it now charges the 4 cells up to .74v then cuts off when the remaining 36 cells hit 4.2. When the charger cuts out the 4 bad cells drop to 0...
  13. O

    Estimating 80% capacity of a battery pack

    Does just pulling the plug have a jarring kind of effect on the cells? I've been doing that with my PF pack to avoid 100% all the time on my cheapo charger but have been wondering if it causes more harm than good...?
  14. O

    Commuter Build Review

    At 48v I use 2 torque arms, they're cheap enough. That battery you linked to is 45ah and 37lbs. 100mm wide, That is a huge battery, where are you going to put it? If you already have everything, why not run it, see how it rides. So much of ebikeing ends up being upgrading anyway, might as...
  15. O

    18650 battery Kit development and discussion[testing done]

    I only found this from the Karmic guy: https://medium.com/karmic-bikes/the-karmic-battery-reborn-a2202c928ef3#.ojtojs5z4 The Zero guy quit Karmic and took the patents with him. http://gouldtech.blogspot.com/2015/05/karmics-electronic-bike-magic-battery.html?view=classic Now he seems to be...
  16. O

    18650 battery Kit development and discussion[testing done]

    I could use those sizes in 4p but looks like you are building 6p? Fwiw the guy from Zero patented a modular 18650 https://www.youtube.com/watch?v=GahcFeTCZgc I think it failed the road testing so isn't being marketed. thanks for your effort, good luck
  17. O

    Help with battery trouble. Is it dead?

    Digital volt meter and check the battery output first. Try not to open up anything else until you do that. Considering you're new to all this, try not to fry anything else. No disrespect just accidents happen. If you need a dvm fast the local hardware or auto parts stores sell them under 20...
  18. O

    Tracking exploding lithium-ion batteries in real-time

    What type cells are they testing exactly?
  19. O

    looking for input on my first e-bike build

    Lead is no good, your hills will run it down quick and you'll be fighting all that extra weight. There are safe lithium chemistries you just need to get the terms right then study up. Don't confuse "lipo" with "li-ion." "Lipo" is the hotrod helicopter stuff that can burn your house. "Li-ion"...
  20. O

    The real reason for torque arms

    Not trying to irk the ire of the self-imposed professional mechanics but i rely on this stuff for all types of fasteners that I intend to take apart again including motor axle nuts
  21. O

    Questions before I pull trigger on em3ev Mac

    48v should have a ta just in case. 2 if possible. Half-twist is nice, depends on your shifters. It won't feel like a motorcycle, you're still on a bicycle, now with chinese plastic. cruise is nice. You may need a freewheel tool if you start it cross-threaded, to remove and start over...
  22. O

    48v grampa trike build

    yep more flex better traction up the dirt hills.. + the flexy frame is decent on bumps You did good at $100, they would ask 250-up where i live. I paid almost that much for mine and had to replace almost everything... still looks rough. Mine has a 3/4 axle and sealed bearings too, so far they...
  23. O

    48v grampa trike build

    What year is your columbia? Do you have a build thread or before pics. Looks like you put some miles on the back tires. Did it come with a tractor axle? I think i saw someone with a jacobsen axle on here. Funny i used to have an old ford rider made by jacobsen but the rear end was more like...
  24. O

    48v grampa trike build

    As the wheel turns... While the right wheel came off easy, the left wheel is froze on at the hub. I broke out the puller, then the torch. Got half the hub glowing red, sweated in a bunch of liquid wrench, all it did was bend the flange. And steam up a wet rag beside the bearing. Hope i...
  25. O

    48v grampa trike build

    My first trike, it takes some getting used to, after a while it is fun on 2 wheels. Although it turns tighter if i lean in & keep it on 3. I'm hoping the new fat back tires will make for softer landings, save the axles. Got the new wheel mounted The 1.95 barely fills out the rim, there is...
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