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GeneralRe: It's quiet. Too quiet ... Pin
phil.o21-Jul-19 2:38
mvephil.o21-Jul-19 2:38 
GeneralRe: It's quiet. Too quiet ... Pin
RickZeeland21-Jul-19 3:35
mveRickZeeland21-Jul-19 3:35 
GeneralRe: It's quiet. Too quiet ... Pin
Mark_Wallace22-Jul-19 6:53
MemberMark_Wallace22-Jul-19 6:53 
GeneralTemplate News - Sometimes You Gotta Laugh Pin
#realJSOP20-Jul-19 15:26
mva#realJSOP20-Jul-19 15:26 
GeneralRe: Template News - Sometimes You Gotta Laugh Pin
Kornfeld Eliyahu Peter20-Jul-19 21:55
professionalKornfeld Eliyahu Peter20-Jul-19 21:55 
GeneralRe: Template News - Sometimes You Gotta Laugh Pin
#realJSOP21-Jul-19 4:15
mva#realJSOP21-Jul-19 4:15 
GeneralRe: Template News - Sometimes You Gotta Laugh Pin
kmoorevs21-Jul-19 10:22
Memberkmoorevs21-Jul-19 10:22 
GeneralSo the dreaded moment has finally come! Pin
CodeWraith20-Jul-19 14:36
MemberCodeWraith20-Jul-19 14:36 
Lithium Polymere batteries are really good. They have high capacities and allow high discharge currents. They are also a little dangerous. When a cell dies, things can get messy, including fire or really unhealthy smoke or contamination.

I bought four 6s (six serial cells = 22.2V) with a capacity 5000 mAh for my model helicopter, a T-Rex 550. In these five years I charged them hundreds of times and spent about 150 hours in the air. I always treated the batteries like raw eggs and up to now all cells of all batteries were always +- 0.01V of the others. I had expected a slow degradation of the capacity and an increase of divergence in the voltages of the cells, but that never happened. It was almost as if the batteries did not age at all.

I should have known that trouble was coming when I charged the batteries today. One cell in the oldest battery was 0.1 V lower than the others and it took an hour of balancing to charge it to -0.03 V relative to the other five cells. The other three batteries were as good as ever. The usual +- 0.01V, as always.

Then, while flying, that cell must have died. Quite unspectacularily actually. No fire, no poisonous smoke, just a helicopter that suddently seemed to be a little tired. After the landing I noticed that the battery was unusually warm and a small LED showed that it was discharged down to under 30% which was a little too low for only half the usual flight time.

Back home, I found that the oviously damaged cell had died. 0V. The other five cells were still at 3.9V (+- 0.01V), as good as ever. Nothing left to do than to try to discharge it, cut off the connector, tape off the wires and off we go to recycling.

I think the batteries held up very well. Three of them are still as good as ever and they already had a long life. I think they are really good quality batteries.

So what are your experiences with such batteries? What do you use them for and how do they hold up? Any burning Teslas?
I have lived with several Zen masters - all of them were cats.

His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.

GeneralBOB Pin
The pompey20-Jul-19 13:31
MemberThe pompey20-Jul-19 13:31 
GeneralRe: BOB Pin
Mike Hankey20-Jul-19 13:37
professionalMike Hankey20-Jul-19 13:37 
GeneralRe: BOB Pin
PIEBALDconsult20-Jul-19 13:49
professionalPIEBALDconsult20-Jul-19 13:49 
GeneralRe: BOB Pin
CodeWraith20-Jul-19 15:19
MemberCodeWraith20-Jul-19 15:19 
GeneralRe: BOB Pin
Patrice T20-Jul-19 20:20
mvePatrice T20-Jul-19 20:20 
GeneralRe: BOB Pin
OriginalGriff20-Jul-19 20:58
mveOriginalGriff20-Jul-19 20:58 
GeneralRe: BOB Pin
CodeWraith20-Jul-19 23:42
MemberCodeWraith20-Jul-19 23:42 
GeneralRe: BOB Pin
Mark_Wallace20-Jul-19 22:00
MemberMark_Wallace20-Jul-19 22:00 
GeneralRe: BOB Pin
Member 1433107621-Jul-19 4:21
MemberMember 1433107621-Jul-19 4:21 
GeneralRe: BOB Pin
Richard Deeming22-Jul-19 9:23
mveRichard Deeming22-Jul-19 9:23 
General50 years today Pin
OriginalGriff20-Jul-19 9:52
mveOriginalGriff20-Jul-19 9:52 
GeneralRe: 50 years today Pin
Mike Hankey20-Jul-19 11:06
professionalMike Hankey20-Jul-19 11:06 
GeneralRe: 50 years today Pin
CodeWraith20-Jul-19 13:27
MemberCodeWraith20-Jul-19 13:27 
GeneralRe: 50 years today Pin
Munchies_Matt21-Jul-19 2:24
MemberMunchies_Matt21-Jul-19 2:24 
GeneralRe: 50 years today Pin
OriginalGriff21-Jul-19 2:32
mveOriginalGriff21-Jul-19 2:32 
RantThe reason I still stick to Chrome. Pin
Chris Maunder20-Jul-19 7:00
cofounderChris Maunder20-Jul-19 7:00 
GeneralRe: The reason I still stick to Chrome. Pin
#realJSOP20-Jul-19 7:45
mva#realJSOP20-Jul-19 7:45 

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