Well I wasn't really expecting this type of battery ejection but I guess it goes to show that anything can happen when you're not expecting it. After crash landing I was puzzled as to why the quad just flipped over when I tried to take off again. Only when I walked 250 metres to where my quad was lying did it all become clear as to the reason.

This happened during my flying session a few weeks ago and was the first LiPo of the session used for flying in Acro Mode.

I'd be interested to know if anyone else has suffered a LiPo ejection for the same reason.



My other videos from this same flying session can be found in my other thread HERE.

I used to get lipo ejection often. Maybe not quite like your. But I started using 3M Dual Lock on the quad and lipo. Best thing ever.

3M Dual Lock Reclosable Fastener TB3870 250/250 Black, 1 in x 10 ft, 2 strips https://www.amazon.com/dp/B007OXK2L8/ref...HCb9CJCSPA

I have an Ummagrip pad on the top of the quad and believe me, no battery is moving anywhere if it's securely strapped onto that, as long as the straps don't fail. Neither the pad nor the strips failed here. They were both still securely holding onto the heat shrink of the LiPo. But that is no use whatsoever if the battery itself is just able to slide out of it's heat shrink sleeving.

I can think of a few immediate possible solutions here:-

1. Bin the heat shrink on the battery cells completely and just run the LiPo naked without any heat shrink on it.
   
2. Replace the heat shrink with a new piece that securely wraps around both ends of the LiPo.
   
3. Secure some kind of bracket(s) to the top of the quad at either end of the LiPo so it is unable to slide out from either end of the heat shrink sleeving (on my quad, the front of the LiPo is against the Firefly bracket, so only the back would need an "anti-slip" bracket).
   

(11-Mar-2019, 12:09 AM)voodoo614 Wrote: I used to get lipo ejection often. Maybe not quite like your. But I started using 3M Dual Lock on the quad and lipo. Best thing ever.

3M Dual Lock Reclosable Fastener TB3870 250/250 Black, 1 in x 10 ft, 2 strips https://www.amazon.com/dp/B007OXK2L8/ref...HCb9CJCSPA

I prefer velcro, but I know JB likes the dual lock more than velcro.  And I would agree with that if the item is only attached with the product.  No wiggle with dual lock.  But strapped, I believe velcro is better....personal choice I guess.  Velcro has been stellar for me for years, and why fix something that isn't broke.

But Dual lock or velcro are better than the different sticky pads guys use for their battery mounts.

I'm guessing that the 'heat' used for the 'heat shrink' was either not long enough or hot enough so it didn't 'shrink' tight enough around the battery. 

I have never seen a lipo ejection like that, but I will now check all my batteries for 'loose' heat shrink. 

(11-Mar-2019, 12:28 AM)SnowLeopardFPV Wrote: I have an Ummagrip pad on the top of the quad and believe me, no battery is moving anywhere if it's securely strapped onto that, as long as the straps don't fail. Neither the pad nor the strips failed here. They were both still securely holding onto the heat shrink of the LiPo. But that is no use whatsoever if the battery itself is just able to slide out of it's heat shrink sleeving.

I can think of a few immediate possible solutions here:-

1. Bin the heat shrink on the battery cells completely and just run the LiPo naked without any heat shrink on it.
   
2. Replace the heat shrink with a new piece that securely wraps around both ends of the LiPo.
   
3. Secure some kind of bracket(s) to the top of the quad at either end of the LiPo so it is unable to slide out from either end of the heat shrink sleeving (on my quad, the front of the LiPo is against the Firefly bracket, so only the back would need an "anti-slip" bracket).
   

If the shrink wrap is clear PVC, I usually replace it with a thick polyolefin tube wrap. It takes damage better much tougher.

(11-Mar-2019, 01:09 AM)Krohsis Wrote: I prefer velcro, but I know JB likes the dual lock more than velcro.  And I would agree with that if the item is only attached with the product.  No wiggle with dual lock.  But strapped, I believe velcro is better....personal choice I guess.  Velcro has been stellar for me for years, and why fix something that isn't broke.

But Dual lock or velcro are better than the different sticky pads guys use for their battery mounts.

I use dual lock and one or two straps. I almost lost a quad due to lipo ejection in my early days because I only used strap.

I agree about the sticky pads. They are good until you get dirt and dust on them. They start to lose their gripping power. Dual lock is immune to these things. They stay grippy forever.

(11-Mar-2019, 02:13 AM)voodoo614 Wrote: If the shrink wrap is clear PVC, I usually replace it with a thick polyolefin tube wrap. It takes damage better much tougher.

Thanks for the tip  I'll certainly take a look into that.

(11-Mar-2019, 02:29 AM)voodoo614 Wrote: I agree about the sticky pads. They are good until you get dirt and dust on them. They start to lose their gripping power.

I use the sellotape / parcel tape trick on mine. If the pad starts to get dusty you just take a piece of good quality sticky tape, stick it onto the Ummagrip pad and then peel it off and it takes the debris with it. Do this a few times with new pieces of tape each time until all the debris is gone from the whole top of the pad. It makes the stickiness of the Ummagrip like brand new again

I agree that you don't have the "hassle" of this extra maintenance with the 3M Dual Lock but that sticky tape trick does bring the Ummagrip back to life when you need to.