greenworks 40v - 4AH

[davec]

Has anyone used this battery?

1. What chemistry is it?
2. Does this unit contain a BMS?
(based on the verbiage "Light indicators for easy check of power level" i am assuming so)

it might not be the cheapest lithium solution but makes me curious what's inside
trying to get ahold of green works for the info- but they are very hard to get ahold of.....

http://greenworkstools.ca/product-detail/40V-4Ah-Li-ION-Battery

 

[friendly1uk]

Sounds like 3.3v cells to me. 12s is 39.6v and as close to 40v as I can get. LifePo

 

[davec]

i got an email response from greenworks
they say it is limn
*guesses* 10 cells in this pack probably
edit:
charger;
40v model 29292
input 100-240v
output 40v dc 1.5a

 

[friendly1uk]

3.7v cells, so a 40v pack is likely 40.7v from 11s (I would of called that 41v) (Actually, I would of called it 40.7v but I understand it's close enough)

10s is just 37v which passes as a 36v pack in old money

 

[el_walto]

Greenworks batteries have been used on some ebikes in the past, but i think 20V packs. Threads are somewhere on endless-sphere. They had 30amp bms if i remember correctly. *Edit*, brand was "yardworks" different company?

If you don't open the packs up, i think you get a 1 year warranty which some people cashed in on after blowing their packs up.

Similar question has been asked here:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=42417

Same question here, but doesn't look like anyone opened the packs:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=46110&p=745413&hilit=greenworks#p745413

Izip bike using 2x 20v 6ah YARDWORKS battery
http://youtu.be/oCvo6ffWRdE?t=1h15m53s

 

[ambroseliao]

If you look at the Amazon page with the part number 29302, you'll see it's listed as a 2Ah battery. Amazon lists the 29282 as the 4Ah battery.

 

[davec]

is anyone familiar with the pins? i dont wanna mess with it too much not knowing the pin diagram- the pin set on the right seems to do 17v -- but the left ones are 0v- im guessing these should be similar to the one used in other packs like greenworks etc...i contacted the vendor hoping to get a response soon
- () () spacer () () +
can't figure out how these give out 40 volts
here's a pic of the charger- you can see the pins
http://www.amazon.com/Greenworks-29292-40-Volt-Amp-Hour-Batteries/dp/B0078KWA8A

 

[davec]

well i got an answer from greenworks - these units seemed like a good pick being 40v and 4ah - i figured i could use 2 of them for 40v 8ah....unfortunately it's a bit more complicated than that. I think i will return these and swap them for some yardworks.
Here is the problem:
i got 4 pins - , C, OHM,+ i put myvolt meter to the - & + terminals and get 0volts. putting the volt meter to C & + reads 19v - putting the voltmeter to - & all other pins reads 0v - so i sent an email to greenworks and got
"That battery is hard to read on a voltage scale because of the B C M pc board, therefore it requires special equipment to test."
the BMS will not allow it work with anything but their products(their charger + lawn mower)
solution would be to open up the unit and d/c bms- inspect the type of cells in them etc... but that would tear the sticker so i won't be doing that....fortunately yardworks did not implement these limiting features.
also looks like CT is discontinuing the products

last edit was Fri Jun 14, 2013 8:26 pm - update
looks like the g-max ones give out the 40v on pins
however gg figured out howto turn the BMS on to get the needed 40v
https://endless-sphere.com/forums/viewtopic.php?f=14&t=55790&start=50

 

[evee]

The newer Greenworks G-Max batteries are awesome. I use them to power a 36V converted Razor e300 scooter described in another thread. 40V is directly available on the pins.