- Messages
- 10,104
- Reaction score
- 24,872
- Location
- TENNESSEEESSEEEEEE
- Arrma RC's
- Limitless
- Mojave
- Typhon 6s
Long-term review of the YoWoo 4s 6000mAh 
Not very happy
I have two of these 4s packs. Last summer/fall I used them in an RC boat running 4s.
A side note here is that boats are tuff on LiPos...
In this specific case, I logged data with the XLX2 so we can see what specific abuse they got to see. These were speed run types of pulls where I was testing the speed, RPMs, and amperage needs of various propellers for the boat. Each pass was around 10 seconds with a slow drive back to the starting point so the water cooling can cool the motor and ESC. I would make around 3-4 passes and then bring the boat in and head home.
LiPos were always kept at storage voltage as soon as I got home and kept at 69-78 F indoors.
Fast forward to this summer they had been on the shelf in the 3.78-3.85 voltage range in storage. and cells are puffed. ( @Tex Koder noticed this also)
After they had been sitting on the shelf for about 6 months I checked them and they were around 3.78v per cell and very unbalanced. Re-balanced them to about 3.83v and shelved them for another 3 months. Had them out this month and did 2 full charges to storage cycles to see how healthy they are.
Checked with the cell checker and each pack has at least 2 cells over 15 mOhms.
20mOhms and 28mOhms were the high ones.
Time to be retired!
Really bummed that I spend so much on these and they didn't last a full year with maybe 10 runs on each one.
Other things to note on these.
Rather than fiberglass G10 plates to protect the lipos they use thin aluminum which is very sharp.
The cells appear to be their own as they have them stamped with the YoWoo name and cell type. Sorry for the blurry image.
Not very happy
I have two of these 4s packs. Last summer/fall I used them in an RC boat running 4s.
A side note here is that boats are tuff on LiPos...
In this specific case, I logged data with the XLX2 so we can see what specific abuse they got to see. These were speed run types of pulls where I was testing the speed, RPMs, and amperage needs of various propellers for the boat. Each pass was around 10 seconds with a slow drive back to the starting point so the water cooling can cool the motor and ESC. I would make around 3-4 passes and then bring the boat in and head home.
LiPos were always kept at storage voltage as soon as I got home and kept at 69-78 F indoors.
Fast forward to this summer they had been on the shelf in the 3.78-3.85 voltage range in storage. and cells are puffed. ( @Tex Koder noticed this also)
After they had been sitting on the shelf for about 6 months I checked them and they were around 3.78v per cell and very unbalanced. Re-balanced them to about 3.83v and shelved them for another 3 months. Had them out this month and did 2 full charges to storage cycles to see how healthy they are.
Checked with the cell checker and each pack has at least 2 cells over 15 mOhms.
20mOhms and 28mOhms were the high ones.
Time to be retired!
Really bummed that I spend so much on these and they didn't last a full year with maybe 10 runs on each one.
Other things to note on these.
Rather than fiberglass G10 plates to protect the lipos they use thin aluminum which is very sharp.
The cells appear to be their own as they have them stamped with the YoWoo name and cell type. Sorry for the blurry image.
. 
