Are there any commercial 48V 20Ah LiPo (Lithium Polymer) ?

[SanFranRider]

I've read about folks building ebike LiPo battery packs from smaller RC batteries, but is anyone producing a safe, commercial-grade 48v20Ah LiPo battery and charger that takes all the guesswork and explosions out of the equation for those of us who are less than electrical engineers?

 

[John in CR]

I've read about folks building ebike LiPo battery packs from smaller RC batteries, but is anyone producing a safe, commercial-grade 48v20Ah LiPo battery and charger that takes all the guesswork and explosions out of the equation for those of us who are less than electrical engineers?

http://www.eigbattery.com/ does, but they seem unresponsive even to a small commercial enterprise. They've been unresponsive to me, but maybe you'll have better luck. Let us know if you get anywhere.

 

[dogman dan]

Closest thing is a 10s pack from hobby king, and then you need a 10s charger. Wish they'd just make a nice 14s charger, that you could just plug a 14s pack into. Putting the pack together is not so hard, but having to do it all the time to charge 6s at a time is not so great. Two chargers could handle a 12s pack though. 12s would be slow compared to 59v from 14s, but it would simplify things. Others just use the meanwells and bulk charge.

 

[slayer]

Batteryspace does ...but they are expensive

Here is an example of 51.8 volts 21 ah 1,328.80
http://www.batteryspace.com/highpowerpolymerli-ionbattery518v21ah1088wh40aratewithpcm.aspx

 

[boostjuice]

Batteryspace does ...but they are expensive

Here is an example of 51.8 volts 21 ah 1,328.80
http://www.batteryspace.com/highpowerpolymerli-ionbattery518v21ah1088wh40aratewithpcm.aspx

....But only rated to 2C max discharge. May as well just buy a Ping.

 

[dogman dan]

I wasn't considering that sort of thing to be in the same category as a 30c turnigy either.

 

[liveforphysics]

I've read about folks building ebike LiPo battery packs from smaller RC batteries, but is anyone producing a safe, commercial-grade 48v20Ah LiPo battery and charger that takes all the guesswork and explosions out of the equation for those of us who are less than electrical engineers?

All these low-C LiPo packs use first generation LiPo. Crap charge rates, crap discharge rates with lots of heating, and awful cycle life.
The premium packs hobby city offers are leading the world in LiPo battery technology, and if you want the advantages of cutting edge LiPo, you're going to have to put up with some inconvience in pack building, or be funded well enough to pay someone to build it for you.

 

[slayer]

Yeah ok when i pointed the batteryspace one i was ansewring what the title of the thread said ,i would not buy them personnaly but they exist as a commercial lipo already made. I did not say i recommand them

For the C rate and cycle life plus the high price they suck!

 

[tycreek]

Batteryspace does ...but they are expensive

....But only rated to 2C max discharge. May as well just buy a Ping.

Not quite the same ... Though either of those should individually provide a usable 30A source for their own periods of time.

A higher C option from that mix could be 2 of the 10Ah packs in a diode isolated parallel configuration (due to PCM/BMS and charging). That should pretty much take care of achieving a light weight 20ah capacity for most any normal ebike setup needing up to 60A continuous draw with much higher peaks. It would give a near plug and play lipo setup though you should still use 2 chargers.

A single one of those 10Ah LiPo batteries driving a 1000w motor at 30-35mph cruise speeds has given me good performance for 10mi/day for about 300mi but I do set a CA limit of 30A for the hub sake (Thank you Ilia). My CA reports maxA of mid to upper 60's after rides (w/30A CA limit) and this is less than what my other 15ah LiFe batteries reported without CA limit (near 80A). I'm ok with that, as it's probably better for the motor and most important is that the battery is half the weight. My daily wh/mi ranges anywhere from 30 to 40 but averages lower mid 30's. My daily end voltage remains in the high 52 to 53v range just the same as when the battery was new. As temperatures start to drop this fall I expect my end voltages to also be lower so it may present a bit of a challenge knowing if the battery is losing life or if it's just the temperature.

The 30 something cycles I have put on that 10Ah LiPo battery are not a good long term gauge, but is more real life use information than I've seen on ES for these to date. I would NOT consider the LiPo safe just because I've not had an issue yet! It is however an easy plug it in and let it charge affair just like my LiFe batteries.