|Ian Whittaker||22/11/2020 22:14:16|
|82 forum posts|
I’m just trying out a couple of batteries purchased cheaply.
Basically the two batteries seem to have the capacity of a 2000-2200mAh pack rather than 4500!
I’ve had other cheap 4500mAh packs previously, at less than half price of other makes and been more than happy with them.
would this seem to be a fair call to return them?
i know the whole buy cheap, buy twice logic but a performance seeming to be less than half a decent package seems astounding and indeed atrocious!
Edited By Ian Whittaker on 22/11/2020 22:14:49
46 forum posts
What brand these batteries? Please
|Tom Gaskin 1||23/11/2020 06:14:27|
|50 forum posts|
I think that we need more information before making any judgement.
What is the 'C' rating of the batteries?
What current are you drawing at full throttle?
How old are the batteries?
What sort of charger are you using?
On the face of it, these batteries are rather sad, but we need the extra bits that I have listed to make a proper diagnosis.
|Brian Cooper||23/11/2020 08:36:37|
671 forum posts
Regrettably, it is all too easy for a manufacturer of Lipos which have "questionable" quality to simply wrap their dreadful product in a label which displays some outrageously optimistic numbers.
We are a trusting lot, so it isn't until we put the batteries "under the cosh" that their deficiencies are revealed.
. . . and then there's that wonderful moment of realisation that we've been had.
|Ian Whittaker||23/11/2020 09:18:00|
|82 forum posts|
Hi Tom, thanks for your thoughts.
The batteries are marketed at 60C
Im unsure of the current, although after a flight no battery has ever been any more than slightly above ambient. They are used in a helicopter, which although certainly current happy is a purpose designed set up, with motor, esc and power train as set out and indeed supplied by the manufacturer. The recommended cell capacity is 2600 to 5200, so I’m not pushing any new boundaries.
The batteries are new.
They are being charged on a Sky RC e680 - a 80w device so at 3.4A (max), although I actually set it at 2A.
I’ve actually contacted the seller who has immediately offered a refund, which I’m happy about. Im not sure if I’ve just received two from a duff batch or if the actual design is actually pitiful!
Edited By Ian Whittaker on 23/11/2020 09:21:55
827 forum posts
Your first post quoted a throttle heavy flight of 4.25 minutes requiring a 3500mAh recharge. That suggests an average current of about 50amps. Hardly an onerous task for a 60C 4500!
|Nigel R||23/11/2020 11:27:28|
4396 forum posts
A reasonably happy ending then.
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