How can you not start off without full voltage?
- Thread starter Mike_V
- Start date
indianajo
Well-Known Member
They claim 80% to 20% charge makes LiIon battery last longer. I've been doing that, full charging twice a year. Full charge is 54.6, I've been doing 53. My battery doesn't usually go below 50 v.
My battery is 5 1/2 years old and working great. About 600 charges. How is yours?
My battery is 5 1/2 years old and working great. About 600 charges. How is yours?
m@Robertson
Well-Known Member
- Region
- USA
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AHicks
Well-Known Member
- Region
- USA
- City
- Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
Most of us use a set of common practices known to prevent abuse of our batteries. Why? Nobody likes replacing them more often than necessary.
To answer your question more specifically, assuming you are talking about charging a 48v battery to 58.6v, you had better be doing this outside where the fire you are encouraging won't do a lot of damage....
Mike_V
Well-Known Member
Yes its a 52V (nominal) beautiful Liquid Wolf 2019 LG 18650 MJ1 cells unknown #cycles 4,600 miles.
OK I charge up from 20%<>80% to 100% and fully balanced just before takeoff.
Yield: The best performance during each ride afterwards the battery returns to rest happily from 20%<>80%
OK I charge up from 20%<>80% to 100% and fully balanced just before takeoff.
Yield: The best performance during each ride afterwards the battery returns to rest happily from 20%<>80%
Last edited:
Mike_V
Well-Known Member
I can still ride, cooled by my fins under full throttle power all day every day after all these years charge it up and do it again no worries.
You know I never am concerned about any possibility of fire because of the fully potted epoxy construction.
I am glad you can still ride and find it in your heart to reply, typing tommy,. I love you
You know I never am concerned about any possibility of fire because of the fully potted epoxy construction.
I am glad you can still ride and find it in your heart to reply, typing tommy,. I love you
AHicks
Well-Known Member
- Region
- USA
- City
- Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
You figure that would be more fire/explosion proof than say a 1/2"+ extruded aluminum case (offered by some of the less expensive production bikes)? If I've understood this thought correctly, I'd like to here the logic behind that call. We aren't talking the amount of electrical resistance here. We're talking containining a heat generated electrical explosion!
harryS
Well-Known Member
I remember Eric Hicks (owns Luna) saying they used wire bonds in the Luna Wolf? Those can act as fusible links, but that won't help if the cells develop dendrites and have an internal short circuit that overheats the cell. You can avoid dendrites by using automotive quality cells.
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On the other hand, wouldn't encasing a cell in epoxy resin render the vents inoperative? The vents are supposed to leak electrolyte, and reduce pressure, before the insides get too hot. I once put a lithoium cell into a holder backwrads, causing it to short circuit with three other cells. By the time I could grab a tool to pry it out, it had gotten hot enough to vent and I had electrolyte dripping out of it,
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Oh well, Grin also encased their Ligo's in epoxy. Gotta make for a heavy battery,.
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On the other hand, wouldn't encasing a cell in epoxy resin render the vents inoperative? The vents are supposed to leak electrolyte, and reduce pressure, before the insides get too hot. I once put a lithoium cell into a holder backwrads, causing it to short circuit with three other cells. By the time I could grab a tool to pry it out, it had gotten hot enough to vent and I had electrolyte dripping out of it,
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Oh well, Grin also encased their Ligo's in epoxy. Gotta make for a heavy battery,.
tomjasz
Well-Known Member
- Region
- USA
- City
- Minnesnowta
Back atcha grasshopper.
harryS
Well-Known Member
As for the OP's question about full voltage, sure you can do it. You could do it 400 times per the above chart, and your battery isn't dead, It will have lost 20% of its capacity, because that's where they stop the test. Now I could argue that you're no worse off than the guy who only charges to 80%, as he has the same capacity but I know that's not true,
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I am still using packs I bought in 2015-2016.. I have the equipment to test capacity. These were Luna packs with Samsung 30Q cells. Originally 3AH/cell when new, they are about 2,5Ah now. That;s almost 20% loss, but they;re still 2..5AH cells and a 48V15AH pack can still put 12.5AH, enough to go 35 miles last Fall on a BBS02B kit they also sold me in 2016. I charge that pack to 100% after every ride, unless it's not going to be used for a while.,
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I am still using packs I bought in 2015-2016.. I have the equipment to test capacity. These were Luna packs with Samsung 30Q cells. Originally 3AH/cell when new, they are about 2,5Ah now. That;s almost 20% loss, but they;re still 2..5AH cells and a 48V15AH pack can still put 12.5AH, enough to go 35 miles last Fall on a BBS02B kit they also sold me in 2016. I charge that pack to 100% after every ride, unless it's not going to be used for a while.,
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m@Robertson
Well-Known Member
- Region
- USA
When the Wolf packs were first introduced, the airwaves (particularly the Endless Sphere crowd) were filled with people talking with certainty about how they were all bombs waiting to go off.
Yes thats right.
Yes exactly, and none of the LIGO packs have blown up either. Its just one of those things that sounds dangerous but apparently there are mitigating factors the layman doesn't factor in. Both packs have been on the market long enough there's been plenty of time to see the predicted catastrophes.
And for sure the packs are heavy relative to what they could be. But its not so bad. I mean... if you are powering a BBSHD an extra pound or two is largely meaningless down low on the frame.
Now... I have seen one done sloppily where the potting did not fully enclose the cells, and that one had a mild burn/melt 'issue' (destroyed the battery but not the bike), but beyond that I haven't seen any fires over the years. Remember also they used that method on several different batteries for different fully-assembled bikes where they made special packs for the bikes. So they didn't just use this idea with the Wolf pack.
I've got two of them, one of the very first ones and a recent model from just over a year ago, sold to me individually despite them saying they don't do that anymore. I got one cuz I've bought so many motors from them over the years and asked the right person nicely
They get into some of the specifics of construction here. Its sales material, of course.
Luna Wolf V2 52v Battery Pack
Distributors and builders of life changing electric bikes.
lunacycle.com
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