Slight battery bulging

David Armstrong · Sep 17, 2016

What are some early warning signs that a battery might be going bad?
I currently have 4 batteries.
The original battery that came with my bird seems to have a slight (very slight, but is enough to notice when you feel across the top flat portion and compare to my newer batteries) amount of bulging.
I have only flown with it maybe 10 times and I have only had the copter for about 3 months.
I also try to follow the charging guidelines very closely.
This may be normal for these batteries, but I would hate to ignore an early warning sign and find out when my bird falls from the air.

hatfield · Sep 17, 2016

I would discontinue using it.

BillyTexas · Sep 17, 2016

You have a 6 month warranty. Call yuneec for a replacement.

Bill W.

Brian Mackey · Sep 17, 2016

speaking of guidelines, do you know what the storage voltage is for the H battery?

BillyTexas · Sep 17, 2016

I would imagine like any other lipo. 3.85 per cell.

Bill W.

Brian Mackey · Sep 17, 2016

BillyTexas said:
I would imagine like any other lipo. 3.85 per cell.

Bill W.

All Lipos the same then? That seems odd.. But, Thank you

BillyTexas · Sep 17, 2016

Brian Mackey said:
All Lipos the same then? That seems odd.. But, Thank you

They all have the same chemistry. Yuneec probably dosent have this info in the manual because they did not provide a way to achieve storage charge.

Bill W.

Brian Mackey · Sep 17, 2016

BillyTexas said:
They all have the same chemistry. Yuneec probably dosent have this info in the manual because they did not provide a way to achieve storage charge.

Bill W.

got it

BillyTexas · Sep 17, 2016

I guess thats where a smart battery comes in handy.

Bill W.

QuadBart · Sep 17, 2016

I've flown some of my other drones with slightly bulging packs before. Not like "swollen" but a teeny bit puffy and had no issues with regard to flight times or sudden loss of power. I'd watch the numbers for each cell after use, before charging, and at full charge. There did not seem to be any cell performing out of spec... They stayed this way for quite some time and didn't have any issues..

BTW, I not telling you they are okay and go fly. Just relaying my experience and that as long as mine aren't swelling any more, cell numbers looks good, and I'm not noticing any odd behavior I'll use mine....

BillyTexas · Sep 17, 2016

QuadBart said:
I've flown some of my other drones with slightly bulging packs before. Not like "swollen" but a teeny bit puffy and had no issues with regard to flight times or sudden loss of power. I'd watch the numbers for each cell after use, before charging, and at full charge. There did not seem to be any cell performing out of spec...

Ive done the same on my fixed wing aircraft with no priblems...but yes be cautious.

Bill W.