You dont get it, there are about 15% capacyty left from 3.7V to 3V. So, it is not a "personal choice" it is a FACT. :lol: So yes, you can bulkcharge those 15% and then "top off" the resting 85% if that is your "personal choice"gblast123 said:I guess the difference is that most bms allow lipo's to discharge to at least 3.0v.. in some instances the cut-off is 2.7 v.
I agree that if u want to keep the pack alive for the longevitiy, the parameters you indicate would do so.
However, there comes a point of diminishing returns.. i generally let my pack go down to 3.0v per cell..and u are right, there is noticible sag below 3.5 or so.
But that is a choice.. not a scientific principle...the choice is to maximize battery life.. and in that case, he is correct.
But to say that something is "almost empty", is clearly not based on the science.. it is based upon personal choice.
parabellum said:You dont get it, there are about 15% capacyty left from 3.7V to 3V. So, it is not a "personal choice" it is a FACT. :lol: So yes, you can bulkcharge those 15% and then "top off" the resting 85% if that is your "personal choice"gblast123 said:I guess the difference is that most bms allow lipo's to discharge to at least 3.0v.. in some instances the cut-off is 2.7 v.
I agree that if u want to keep the pack alive for the longevitiy, the parameters you indicate would do so.
However, there comes a point of diminishing returns.. i generally let my pack go down to 3.0v per cell..and u are right, there is noticible sag below 3.5 or so.
But that is a choice.. not a scientific principle...the choice is to maximize battery life.. and in that case, he is correct.
But to say that something is "almost empty", is clearly not based on the science.. it is based upon personal choice.
Alan B said:Try an experiment, charge to 3.7V and see how many amp hours you can draw before they fall off the cliff. Normal charge is 4.2, many charge to 4.1. Charging to 3.7 won't push it up the energy curve very far. You cannot compare charging to discharging voltage.
hydro-one said:i will not discharge below 3.7 resting voltage. so i set my pack level bms at 3.7v per cell. this keeps cells from getting killed off, if there is a slight imbalance in the pack. there is very little useful energy to be had below that. mega sagville
gblast123 said:hydro-one said:i will not discharge below 3.7 resting voltage. so i set my pack level bms at 3.7v per cell. this keeps cells from getting killed off, if there is a slight imbalance in the pack. there is very little useful energy to be had below that. mega sagville
that is your choice..nothing wrong with that
gblast123 said:miuan said:gblast123 said:In a pinch, i can use the regular 24v charger that comes with the mobility scooter to bulk charge the pack up to about 3.7v per cell.
3.7V per cell is almost empty.
I think a look at any Lipo discharge curve would indicate that your statement has little to no merit.
But take a look and get back to me on this.
miuan said:Hurry guys, the 16Ah bricks are now in stock at EU Warehouse!
striker54 said:I hope they can sustain the 2.5C continuous rate with no major voltage sag, according with icecube's tests, because i will use them with the adaptto max-e and cromotor.
I will use a 22s 40Ah pack (16ah+16ah+8Ah), so in theory good to 100A continuous.
Offroader said:striker54 said:I hope they can sustain the 2.5C continuous rate with no major voltage sag, according with icecube's tests, because i will use them with the adaptto max-e and cromotor.
I will use a 22s 40Ah pack (16ah+16ah+8Ah), so in theory good to 100A continuous.
Yeah I am planning on using it with the cromotor and max-e at 22S also.
What type of bike do you have where you can fit a whopping 40amp hours at 22s. That's a very large pack.
striker54 said:Offroader said:striker54 said:I hope they can sustain the 2.5C continuous rate with no major voltage sag, according with icecube's tests, because i will use them with the adaptto max-e and cromotor.
I will use a 22s 40Ah pack (16ah+16ah+8Ah), so in theory good to 100A continuous.
Yeah I am planning on using it with the cromotor and max-e at 22S also.
What type of bike do you have where you can fit a whopping 40amp hours at 22s. That's a very large pack.
Vector frame
I have to start a build thread :wink: