48V 20AH battery for sale on ebay in USA any good?

[mushymelon]

Good to here your warranty was honoured and your happy with the battery.

I would not be surprised after a few cycles and a few overnight charges it charges up a few more volts. My 48v 20ah Vpower pack charges to 60v and holds at 60 when the charger is unplugged then its slowly tapers down to 57 or 56 overnight.

When in use the battery it quickly burns off the surface charge and runs in the 52 53v range when it starts to dip down under 50v I've used 13 + ah at that point. lvc is at 46.5 v and its around 17.5 17.9ah.

When the battery was new it would charge to 60v but drop down to 56v when the charger was unplugged but after a few cycles and then i forgot to unplug it for three days. it holds the same volts as the charger output. 60v.

The same thing happened after storing it for the winter, a few cycles and 48 hours on the charger all cells balanced and works the same after 100+ cycles 2500+ km

 

[randel24]

Guy's, can we here your trial's on these batteries?,I want to pull the trigger on a 48v15ah,48v20ah battery, I'm not getting the answer's I need from various suppliers! I don't want to build my next battery box until i get the next one. thanks, Randel.

 

[RVD]

Well, I have played around with both the 48v 15ah battery and the 48v 20ah battery. I received 1 battery that was 1 cell short so the company did take it back and send me another with with the correct number of cells.

The batteries appear to be in good condition and made well.

The charger seems to be good.

I have also purchased Ping batteries in the past. Unlike Ping, these batteries don't have leds that light up on the BMS so you can see when the batteries are fully charged and balanced.

Voltage sag appears to be normal for these types of batteries.

Hot off the charger, my batteries are around 57v. They die down to about 54v pretty quickly and sag to down to about 52v or so with time. With sag you see 48-51v most of the time on the cycleanalyst.

I'm not sure what else to say...overall I think these batteries are a good alternative to Ping. You will get faster shipping in the US since you will probably have your batteries in hand within 1 week of paying for them.

 

[Bubba]

My setup of using two 24v 10ah batteries has been working fine for almost 2000 miles now! To work and back every day (19 miles roundtrip) without a hiccup.

 

[Bubba]

Does anyone know if these are still for sale? Their website don't give ordering info and I can no longer find them on ebay. I'd like to add another 24v battery to my bike. Need for speed!

 

[granolaboy]

Also wondering if they ship to canada....

 

[joe tomten]

Their website has changed.
http://www.goasisenergy.com/products-page/48v-lifepo4-battery-packs/

 

[mythprod]

I know this is an older thread but I thought I'd chime in since this is one of the threads that convinced me to purchase from Green Oasis. I just purchased a 48v 20ah battery and it's charging now, my ebike kit won't be here until next week. I'm quite the noob so I'm not sure I could offer any information at the moment as to its quality, bms type and other details, but I can say that I ordered it late Saturday night and it showed up Wednesday - much faster than what I was expecting! A 3a charger came with the pack and it looks as though the pack was fully charged by the time it got to me (this was confirmed by John). I plugged in the charger and it only charged for a couple of minutes before shutting off and LED going green. Again I'm a noob so I'm not sure when balancing if all chargers blink green / red until everything is fully charged and if mine was already balanced which is why my charger didn't seem to do any blinking. I'm definitely jazzed about finding a US dealer and the service and product have been good so far

 

[Jason27]

What us dealer did you buy from?

 

[dnmun]

I know this is an older thread but I thought I'd chime in since this is one of the threads that convinced me to purchase from Green Oasis. I just purchased a 48v 20ah battery and it's charging now, my ebike kit won't be here until next week. I'm quite the noob so I'm not sure I could offer any information at the moment as to its quality, bms type and other details, but I can say that I ordered it late Saturday night and it showed up Wednesday - much faster than what I was expecting! A 3a charger came with the pack and it looks as though the pack was fully charged by the time it got to me (this was confirmed by John). I plugged in the charger and it only charged for a couple of minutes before shutting off and LED going green. Again I'm a noob so I'm not sure when balancing if all chargers blink green / red until everything is fully charged and if mine was already balanced which is why my charger didn't seem to do any blinking. I'm definitely jazzed about finding a US dealer and the service and product have been good so far

the charging lights turn on and off when the charging mosfet on the BMS turns on and off.

the charging mosfet turns off when the voltage on any cell climbs over 3.9V. there will be one cell that is much higher than the others and it determines how rapidly the pack charges up, and if it is bulk charging then being unbalanced a lot means longer times on the charger.

balancing is done by the shunt transistor and is different from the charging mosfet and they do different things. the shunt transistor begins to turn on as the charging voltage climbs over 3.6V and that transistor then diverts the charging current around the cell to prevent the cell from overcharging. this is the primary function of the BMS.

you can determine if your BMS is balancing the pack by measuring the cell voltages while the pack is on the charger to see what voltages the BMS can fix as the final charging voltage.

then when you list the voltages, it will be apparent whether the pack is balancing or not. the ping leds do that visually for a lot of people. monitoring devices are used to visually monitor cell voltages too.

 

[docnjoj]

These are the batteries I was trying to remember as I recall they used the fairly large round cells that are easier to work with than pouch cells. I don't need a battery now but if in the future I do these are an alternative to Ping and easier to repair when cells go bad. I now think that the A123 20 ah pouches and agniusm's kits are the bees knees for this type and ah/hrs set up. This could change in a heartbeat if A123 become regularly availible in the USA> They would rule!
otherDoc

 

[mythprod]

What us dealer did you buy from?

http://www.goasisenergy.com/

 

[mythprod]

monitoring devices are used to visually monitor cell voltages too.

What kind of monitoring devices would be most user-friendly for a noob?