Dumb thing of the day

[tlandauer]

I went to do more trial runs with my Zippkits JAE 21 rigger today. I was using Grim 4s 5000mah, after the first run ( 1'32") , I brought her in to check temp and everything else with the intention of changing to a fresh pack, well I ended up putting the SAME ( they are all yellow, what can I say??) one back in and ran for another 2 minutes or so, the end of the story is that the voltage reading was at a all time low of 3.5v/cell. The HYPERION EOS SENTRY tells me a reserve of 5%.
Is this battery history??
The temp on the battery was 130* and is not puffed, still hard. I charged it back to storage now.

I rarely run my batteries below 20%. Brain wasn't working!!

[urbs00007]

I went to do more trial runs with my Zippkits JAE 21 rigger today. I was using Grim 4s 5000mah, after the first run ( 1'32") , I brought her in to check temp and everything else with the intention of changing to a fresh pack, well I ended up putting the SAME ( they are all yellow, what can I say??) one back in and ran for another 2 minutes or so, the end of the story is that the voltage reading was at a all time low of 3.5v/cell. The HYPERION EOS SENTRY tells me a reserve of 5%.
Is this battery history??
The temp on the battery was 130* and is not puffed, still hard. I charged it back to storage now.

I rarely run my batteries below 20%. Brain wasn't working!!

I did worse. ran 2 3-s in series dinogy 65c. the prop was bent, didnt realize . battery temps 130. puffed. 3.18 volts per cell. went down to normal and charged and balanced fine, but dont expect much life out of them. who knows?

[kfxguy]

I think the danger zone is below 3.0v. Safe zone is above 3.3 or so. Your fine, I wouldn't worry about it.

[tlandauer]

I did worse. ran 2 3-s in series dinogy 65c. the prop was bent, didnt realize . battery temps 130. puffed. 3.18 volts per cell. went down to normal and charged and balanced fine, but dont expect much life out of them. who knows?

Guess we have all done things we are not proud of!

I think the danger zone is below 3.0v. Safe zone is above 3.3 or so. Your fine, I wouldn't worry about it.

Thanks, I should see in the next few days, I can tell you the Grim packs are pretty amazing. I thought for sure it will puff, but still hard as a rock---not that it is necessary an indication of how the actual condition is.

[photohoward1]

Don't worry about it.

[rickwess]

You're fine.

[capnswanny]

Ditto, no worries....

[tlandauer]

Don't worry about it.

You're fine.

Thanks for the assurance!

( I wouldn't mention the time that I hooked up two 4s in series thinking that I was hooking them up as in parallel )

[capnswanny]

( I wouldn't mention the time that I hooked up two 4s in series thinking that I was hooking them up as in parallel )

Sounds like my love life.....hot and fast...for a few brief moments of bliss!...

[tlandauer]

Ditto, no worries....

Thanks! I didn't realize that until I got home, all the way while I was driving I couldn't understand why the battery was depleted so much...

Sounds like my love life.....hot and fast...for a few brief moments of bliss!...

Ah yes, feel good while it lasts....

[rickwess]

I've had two packs go to pretty much zero and I was able to nurse them back to a state that the charger could charge them "normally". I needed to turn off the balancer setting and fool the charger that they were 1s, 2s and 3s until i could charge with the balancer as 4s. With the balancer turned off, it's 2A max charge for a 120 seconds. Needless to say it took many, many of these short sessions to bring them back.

Now how they got that way is the sad story. I had put the batteries on a storage charge, but when the charge was complete, one of my helpers just turned off the charger but left the batteries plugged in. It was the next day before I noticed.

[Doug Smock]

Keep an eye on those packs fellas. You may or may not notice a capacity loss, but it's there.

D.

[rickwess]

Keep an eye on those packs fellas. You may or may not notice a capacity loss, but it's there.

D.

I have been. I haven't noticed anything yet in the last year. I did run them through 3 slow charge/discharge cycles on the charger once they were nursed back.

[tlandauer]

I've had two packs go to pretty much zero and I was able to nurse them back to a state that the charger could charge them "normally". I needed to turn off the balancer setting and fool the charger that they were 1s, 2s and 3s until i could charge with the balancer as 4s. With the balancer turned off, it's 2A max charge for a 120 seconds. Needless to say it took many, many of these short sessions to bring them back.

Now how they got that way is the sad story. I had put the batteries on a storage charge, but when the charge was complete, one of my helpers just turned off the charger but left the batteries plugged in. It was the next day before I noticed.

Thanks for sharing, I wonder why the charger would allow reverse flow?

Keep an eye on those packs fellas. You may or may not notice a capacity loss, but it's there.

D.

Yes, I am, thanks for the heads up/reminder!

I have been. I haven't noticed anything yet in the last year. I did run them through 3 slow charge/discharge cycles on the charger once they were nursed back.

That is no simple feat---to nurse them back. Don't think my charger would allow me to turn off the balancing board, I use DuraTrax Ice charger and it needs external balancers like the ones from GREAT PLANES sold @ Towerhobbies. ( http://www3.towerhobbies.com/cgi-bin...&I=LXMGS7&P=SM) It won't go into charge mode without this connected.
Glad that you didn't see a drop in capacity though.