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lipo very very fast charge !!

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og28/07/2017 18:02:22
61 forum posts
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just reading on another forum about a guy who charges his 6s 4000mah in 10 mins at the field using 10-15 amps - surely thats not possible or safe

Percy Verance28/07/2017 18:10:06
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It isn't something I'd want to do, but I imagine he's charging at something like 5C or more?

He's probably doing it to save time so he gets more time in the air. Personally I'd prefer several batteries for that particular model, and stick to charging at .75 or 1C. Again, it's just my take on it.  Others will doubtless do it differently......

I fly with one bloke who brings about 30 charged packs to the field for a day's flying, to allow him to fly much more often than would otherwise be the norm.

Edited By Percy Verance on 28/07/2017 18:27:46

og28/07/2017 18:16:31
61 forum posts
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he states on his post he charges the battery in situ (wot 4) at the field

personally I will take 2 -3 models with 3 or 4 charged batteries for each model, thats plenty for a whole days flying for me

Percy Verance28/07/2017 18:30:38
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Charging a LiPo pack in a model isn't something I'd do. It's much easier to keep an eye on things if the pack is out of the model. If anything went wrong, he loses his model as well as the battery. Maybe he likes an element of risk?

MattyB28/07/2017 18:59:42
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Posted by og on 28/07/2017 18:02:22:

just reading on another forum about a guy who charges his 6s 4000mah in 10 mins at the field using 10-15 amps - surely thats not possible or safe

If he can charge a 4000mah in 10 mins at 10-15A forget the safety concerns - he's broken the laws of physics. Is he a time lord by any chance?!!

Dave Bran28/07/2017 19:41:27
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Posted by og on 28/07/2017 18:02:22:

just reading on another forum about a guy who charges his 6s 4000mah in 10 mins at the field using 10-15 amps - surely thats not possible or safe

Does not say how depleted the battery was so of course its possible! 16A is "only" a 4C charge rate.

In the days of the orange shrink-wrap covered "Tipple" packs of near ten years ago now I regularly charged them from 10-15% left at 3C at the field in the open. I had tried 5C and they didn't object! Never ever used storage charge. Some of those packs are STILL with me!

MattyB28/07/2017 19:52:22
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On the subject of charge rates I have tried a few somewhat quick scientific experiments and found that all my current packs can be charged at 2C without any significant warming occurring. Since heat has a major part to play in battery degradation this is good news. Above 2C there is some variance between packs and sizes - smaller packscseem to warm more than bigger ones, whilst my newest Graphene batteries charge cooler than all my older packs from Gens Ace and HK of similar capacity (not surprising given their very low IR.

What does all this mean? Probably not a huge amount - you'd need a much bigger sample size and more accurate temp measurement along with IR and capacity checks throughout the pack life to draw truly valid conclusions. I am comfortable that the current generation of cells can all be charged at 2C every time though with no meaningful impact on cell life, capacity or IR; above that an YMMV dependant on brand, pack construction and plain old luck!

Edited By MattyB on 28/07/2017 19:53:26

og28/07/2017 20:07:23
61 forum posts
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i was under the impression that safe charge rate was 10% of battery capacity

MattyB28/07/2017 21:05:49
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1947 forum posts
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1/10C? For old school nicads maybe, but not Lipos, LiFes or even modern NiMHs! Us sparkles wouldn't get much flying in if we could only field charge at that rate...

Edited By MattyB on 28/07/2017 21:06:10

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