Recent content by oobagooba

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...

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...

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...

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...

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...

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

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...

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....

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...

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...

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.

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...

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...?

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...

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...