By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

New batteries - cheap junk?

All Topics | Latest Posts

Search for:  in Thread Title in  
Ian Whittaker22/11/2020 22:14:16
82 forum posts
1 photos

I’m just trying out a couple of batteries purchased cheaply.
Testing, both on a discharger and in the aircraft seems to show a terrible performance - they give about 1000mAh and show 50% charged, in the air a very gentle 2 minute flight uses 40% (a throttle heavy flight usually uses about 60% in 4 1/4 minutes, and takes about 3500mAh to recharge.
In both instances (discharger and in flight the pack only seems to take 1200-1400mAh to recharge.

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

iflylilplanes23/11/2020 02:04:01
avatar
46 forum posts

What brand these batteries? Please

Dave

Tom Gaskin 123/11/2020 06:14:27
50 forum posts
5 photos

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.

Tom

Brian Cooper23/11/2020 08:36:37
avatar
671 forum posts
29 photos

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. sad

Ian Whittaker23/11/2020 09:18:00
82 forum posts
1 photos
Posted by Tom Gaskin 1 on 23/11/2020 06:14:27:

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.

 

Tom

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!
I have had in the past used a cheaper, smaller than normal pack, a 4500mAh pack marketed by Ripmax (from memory) and found it ideal. Yes, the remaining capacity was slightly less on landing but that’s to be expected as it’s a smaller capacity anyway. It just meant I had about 30% remaining as opposed to 40 - not a problem. I’d still be using it but it got damaged during an ‘uncontrolled arrival’...

Edited By Ian Whittaker on 23/11/2020 09:21:55

Dickw23/11/2020 10:46:27
avatar
827 forum posts
103 photos
Posted by Ian Whittaker on 23/11/2020 09:18:00:........................

The batteries are marketed at 60C

Im unsure of the current, .......................................................

Edited By Ian Whittaker on 23/11/2020 09:21:55

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!

Dick

Nigel R23/11/2020 11:27:28
avatar
4396 forum posts
717 photos
Posted by Ian Whittaker on 23/11/2020 09:18:00:

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!

A reasonably happy ending then.

All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
Sussex Model Centre
Slec
CML
Subscribe now
electricwingman 2017
Advertise With Us
Sarik
Latest "For Sale" Ads
NEW POLL - has the pandemic altered your event safety perceptions?
Q: Has the covid pandemic deterred you from attending shows and events in 2021?

 No, I'll be attending just as many as I usually do
 No, but I'll choose my event with greater care
 Yes, I'll attend fewer events going forward
 Yes, I wont attend any where previously I have

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!