About to order 48v15ah li-ncm from BMSBattery, should I??

[nukezero]

if you are new. you should reconsider. if you have no experience with batteries and need to ask others what to do, you should not be building a battery out of the little lipo cans which you have to solder to each other. you should just buy a battery off ebay and use it until you can learn how to work with batteries.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181379826645

or look at what sun-thing28 is offering now on ebay.

i'm not using lipo's. I'm using much safer 18650 Samsung 25R cylindricals. I do have a background in EE but mostly in Computer Engr. So I do have some intermediate EE skills and lots of soldering/lab work.

My past experience with RC Lipo's were not great when I used them with flying my nitromethanol helicopters. The LiPo's were lightweight, expensive, but tend to swell or bubble only after 10-15 flights. I had used a balance charger as well. The lipo was not connected to any other packs, other than a simple 7.4V pack designed to move servos.

my opinion is that 18650's are a bit safer than pouch based cells. provided that like any batteries, you don't overcharge it. I am planning to use a quality BMS. Not the cheeap looking ones on alibaba. There is a buyer on eBay in China who will be tab welding the packs for me in 1S4P configurations and putting solder tabs. All I have to do is solder each 4P pack in series, wire the BMS, and hook it up.

 

[tomtom123]

if you are new. you should reconsider. if you have no experience with batteries and need to ask others what to do, you should not be building a battery out of the little lipo cans which you have to solder to each other. you should just buy a battery off ebay and use it until you can learn how to work with batteries.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181379826645

or look at what sun-thing28 is offering now on ebay.

i'm not using lipo's. I'm using much safer 18650 Samsung 25R cylindricals. I do have a background in EE but mostly in Computer Engr. So I do have some intermediate EE skills and lots of soldering/lab work.

My past experience with RC Lipo's were not great when I used them with flying my nitromethanol helicopters. The LiPo's were lightweight, expensive, but tend to swell or bubble only after 10-15 flights. I had used a balance charger as well. The lipo was not connected to any other packs, other than a simple 7.4V pack designed to move servos.

my opinion is that 18650's are a bit safer than pouch based cells. provided that like any batteries, you don't overcharge it. I am planning to use a quality BMS. Not the cheeap looking ones on alibaba. There is a buyer on eBay in China who will be tab welding the packs for me in 1S4P configurations and putting solder tabs. All I have to do is solder each 4P pack in series, wire the BMS, and hook it up.

what cells are you using? i was thinking of getting 18650 cells also but most of them have low discharge. The high discharge ones are way too expensive for me. Lipos require too much maintenance for me and i can't take the risk. So my choices now are make a custom decent discharge rate 18650 pack, or buy those liconm packs from bmsbattery.

 

[nukezero]

if you are new. you should reconsider. if you have no experience with batteries and need to ask others what to do, you should not be building a battery out of the little lipo cans which you have to solder to each other. you should just buy a battery off ebay and use it until you can learn how to work with batteries.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181379826645

or look at what sun-thing28 is offering now on ebay.

i'm not using lipo's. I'm using much safer 18650 Samsung 25R cylindricals. I do have a background in EE but mostly in Computer Engr. So I do have some intermediate EE skills and lots of soldering/lab work.

My past experience with RC Lipo's were not great when I used them with flying my nitromethanol helicopters. The LiPo's were lightweight, expensive, but tend to swell or bubble only after 10-15 flights. I had used a balance charger as well. The lipo was not connected to any other packs, other than a simple 7.4V pack designed to move servos.

my opinion is that 18650's are a bit safer than pouch based cells. provided that like any batteries, you don't overcharge it. I am planning to use a quality BMS. Not the cheeap looking ones on alibaba. There is a buyer on eBay in China who will be tab welding the packs for me in 1S4P configurations and putting solder tabs. All I have to do is solder each 4P pack in series, wire the BMS, and hook it up.

what cells are you using? i was thinking of getting 18650 cells also but most of them have low discharge. The high discharge ones are way too expensive for me. Lipos require too much maintenance for me and i can't take the risk. So my choices now are make a custom decent discharge rate 18650 pack, or buy those liconm packs from bmsbattery.

I am using Samsung INR18650-25R. They are 10C rated 20Amp max continuous discharge. One of the best out there right now, on par or near with Sony VTC5. Sony VTC5's are great too but very expensive. Those are the only two cells that i know of that have extremely high discharge and decent capacity. Paul (em3ev) will be getting the 25R's in 2-3 months so you know if he vouches for it, it's good. He currrently has the lower capacity version, 20R, but I don't like it. I want more capacity, more power!

I agree, LiPo is not good for me. The maintenance will be VERY high. Not to mention fire risk. LiPo is not as forgiving as 18650s.

 

[dogman dan]

4 p sections tab welded would make home pack building much simpler. No more soldering direct to the cell.

 

[eli-f]

Forget RC hobbyking LiPo's because I live in a condo. If a fire goes, I'd be taking 3 neighbors with me. (<-- well that may not be true as our state-of-the-art condo has a sprinkler system in each room).

Hilarious. A valid reason when living in shared spaces.

 

[999zip999]

Funny ? Hay Nuke I'm was hoping to find info about these high power bms li-nmc pack and it a another build thread. It would be hard to buy from bms battery with some of the horror stories, maybe not as many as Victpower. I did get 25 A123 20ah cells from Victpower 24 still working after 2yr. 450 cycles. So ?
But I think I would go with a 18650 spot welded paralle strip build. The price for ah is a little high.