Recent content by mikereidis

Cool, yes, as long as the LiMn is in good shape... :) (Unlike many of mine.) I finally got around to testing out my 5 TME Xtrema balancers/cell monitors. At 0.1" the pins fit nicely into the BMS cell monitor connector on these YW batts, though I'm not sure the pin thickness is an exact match...

So I presume you parallel each individual cell ? IE. in addition to the main terminals you run 4 cell paralleling wire runs for each 5s (5 cell) battery ? If so how did you hook to the cells ? I did some cell hookups by various methods in order to bypass bad cells, but it was ad-hoc and wasn't...

Hi 29a. Heck, I was debating 4 returns vs. 3 returns. Wouldn't even consider 9 in one return. Yeah, I was aware of the cash refund if they aren't stocked. Hadn't thought of return and rebuy to extend warranty though... :mrgreen: One small store in Bells Corners had no battery stock for most of...

Thanks Takemehome... Hmmm, so do you only switch the + terminal of charger to + of the batts when charging ? I haven't tried a permanent charger hook up yet, but I would have thought that, BMS cut off or not, this would be pretty much equivalent to having the YW batt in a YW charger with the...

Hey all, long time no post ! :) So did this thread die ? As mentioned in my Arduino Charger/BMS thread I went kinda manic on that project in the late fall, and that contributed to a bout of depression that resulted in my leaving my job on disability, and I wasn't able to get much else done...

Hi all, long time no post ! :) I've had a few PMs, so here's my 'update' on this and related projects: I went kinda manic on this project in the late fall, and that contributed to a bout of depression that resulted in my leaving my job on disability, and I wasn't able to get much else done...

With two diodes for each cell connection, either the balancing resistor board (not shown here) or the voltage sensing resistor divider board will be able to tap micro power from the battery pack, or use a separate battery for battery torture or high accuracy testing. With the diodes and a bit...

To right of PWM chip are 4 TI 74HCT4351E 8 channel analog/digital mux / demuxes with address latches. Primary purpose is the selection of 2 random differential voltages, or 4 single ended voltages simultaneously. Also usable as generic digital I/O. Chips are optional, can use 0-4 depending on...

Board is modular and split into logical/functional/conceptual blocks that could also be cut into physical blocks to make smaller PCBs. This is not just an ebike or BMS project; The board is a generic I/O expansion device for micros and could be used for data acquisition, N-phase motor control...

:)

Status update: - I'm expecting 3 "36v" (actually 33v nominal) refurbished DeWalt packs from Dr Bass soon. They are 2.3 AH each, I guess 123 cells (M1 ?). They are almost exactly the same price per watt hour from the Dr as these YW batts. 3 packs almost (33v, 6.9AH) exactly same price as 2 YW...

The BMS seems designed for 31 amps, so I'd say these cells are good for 30 amps (5C) without immediate damage. It's up to you how much you want to derate that for the cycle life you desire. My wacker tripped the BMS just once, in VERY deep heavy wet grass (with close to full charge so I don't...

:) :) That was my first thought; after I got over the shock of seeing Justin reading the instruction sheet. Once the intelligence gets added to bike (human and multiple controllers, CAs, etc.) perhaps some "Lil Smarty" text should be added.

:) :) That was my first thought; after I got over the shock of seeing Justin reading the instruction sheet. Once the intelligence gets added to bike (human and multiple controllers, CAs, etc.) perhaps some "Lil Smarty" text should be added.

Yes, maps of charging locations would be very nice, especially when visiting unfamiliar areas. I'm imagining an era of "e-bike wanderers" who travel from place to place depending on whims, needs and season. :) In theory, we could feel better by leaving 10, 20 or 25 cents in an envelope or...