Hello Fellow Yuneec Pilot!
Join our free Yuneec community and remove this annoying banner!
Sign up

ST16 battery sloooow charge

Joined
Jun 20, 2018
Messages
406
Reaction score
262
Location
Cleveland TN
I accidentally left the ST16 turned on this afternoon.
After 2 hours recharging, the charge display was the same.
The built-in charge controller was only drawing 200ma from my USB cable.
The 3P 18650's should be able to charge at 2000ma.

Time to crack the case & apply juice!
That knife is dulled to use as a spudger.
That and a mallet does the trick.

After the picture, I set the supply to 3000ma constant current.
I'll set it back in 1 hour.
1683516836
 
Last edited:
Lion cells do not perform well if deeply discharged. What voltage are you reading? If it was below about 3 volts per cell the pack is pretty much toast.
 
Lion cells do not perform well if deeply discharged. What voltage are you reading? If it was below about 3 volts per cell the pack is pretty much toast.
I was so focused on cracking the case without shorting anything that I didn't think to measure the voltage.
I assumed the ST16 would shut off if voltage got too low?

After 1 hour I set the supply to constant voltage.
At that point the pack was drawing 2000ma.
30 minutes later it's down to 1000ma.
The cells are cool.

These cells look like the type that have a high watt cut button in the top.
 
Last edited:
I accidentally left the ST16 turned on this afternoon.
After 2 hours recharging, the charge display was the same.
The built-in charge controller was only drawing 200ma from my USB cable.
The 3P 18650's should be able to charge at 2000ma.

Time to crack the case & apply juice!
That knife is dulled to use as a spudger.
That and a mallet does the trick.

After the picture, I set the supply to 3000ma constant current.
I'll set it back in 1 hour.
View attachment 16835View attachment 16836
I suspect that the battery will charge quickly. I believe that the ST16 has circuitry that prevents continuous full charging. Probably a safety concern. I addressed this in a thread several weeks ago. I was hoping to get feed back either supporting or disproving my hunch. Here's the thread: ST16 battery charging considerations
 
WARNING!
Be very careful when re-assembling the case.
The control PCB ground and the battery + bus strap are very close.
 
I suspect that the battery will charge quickly. I believe that the ST16 has circuitry that prevents continuous full charging. Probably a safety concern. I addressed this in a thread several weeks ago. I was hoping to get feed back either supporting or disproving my hunch. Here's the thread: ST16 battery charging considerations
That's the thread I was looking for...
 
Fascinating. Seems far to many Yuneec Pilots will go to any length to save a buck and risk much in the process. I often wonder if they would take the same risks if those risks could be seen.
 
  • Like
Reactions: AH-1G and Phaedrus
I accidentally left the ST16 turned on this afternoon.
After 2 hours recharging, the charge display was the same.
The built-in charge controller was only drawing 200ma from my USB cable.
The 3P 18650's should be able to charge at 2000ma.

Time to crack the case & apply juice!
That knife is dulled to use as a spudger.
That and a mallet does the trick.

After the picture, I set the supply to 3000ma constant current.
I'll set it back in 1 hour.
View attachment 16835View attachment 16836
That happen to me and i just ordered a new battery from amazon for about $50.00 works just fine now just could not handle the stress of losing my st16
 
This thing happened to me several time...once , it took abiut 24 hours to reach the complete charging... the shop changed the whole batteries packaging of GCS but without any appreciable results....after few days the battery seemed to me to wake up and at least it took ‘bout 6 hours for a complete charging, using a SKY 100 charger..... anyway, there’s no way to balance neither to know which kind of batteries inside ( i suppose 3 model 18650 type)....
 
This thing happened to me several time...once , it took abiut 24 hours to reach the complete charging... the shop changed the whole batteries packaging of GCS but without any appreciable results....after few days the battery seemed to me to wake up and at least it took ‘bout 6 hours for a complete charging, using a SKY 100 charger..... anyway, there’s no way to balance neither to know which kind of batteries inside ( i suppose 3 model 18650 type)....
Yes, there are three 18650's in parallel.
I Googled the model number on them.
They are 2400mAh lithium ion.
I have salvaged others like them for use in flashlights & headlights.
My Opus BT-C3100 charges 18650's at up to 1000ma
 
Last edited:

New Posts

Members online

No members online now.

Forum statistics

Threads
20,955
Messages
241,590
Members
27,284
Latest member
csandoval