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Old Feb 07, 2008, 08:14 AM
Ted M
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iMax B8 Charger Thread

I have bought the iMax B8 charger and I'm fairly happy with it but I don't see a thread that specifically gathers all information for the B8 into one place so I'm starting one here.

Subjects that I'd like to get input on are:

1 The accuracy issue. In the iMax B6 thread there are data suggesting that, because the voltage sensing resistors used are 1% rather than 0.1% accuracy, this causes a dangerous problem of not having perfectly measured voltages for each cell. There is a fix for the B6 which involves changing some resistors and this is possible for the B8 but it involves rework of surface mount components and is not for the faint-hearted! I suspect that the importance of this issue may be over-stated but I'm open to looking at objective data. Also I bought mine from Hobby City after they said that new supplies of the charger from the manufacturer would fix issues associated with accuracy.

2 Understanding the Modes. Apart from bad English in the manual, it simply has a missing section on what the LiPO Balance mode does. I'm not sure if the LiPO CHARGE balances while it charges although my observation of the B8's individual cell voltages in this mode seems to indicate that the charger is bringing the cells up to the same voltage.

3 The manual is awful! We should try to get a revised one.

4 PC Software that works with the USB port would be nice to have. Any info on this would be useful.

5 Balancing leads for connecting 2S batteries, 2 x 3S, or 3 x 2S are something I'm already working on. I believe that there ought to be a 2S lead supplied in the box.

I'm trying to contact SkyRC to get more info on some of these topics. Feel free to chip in here but please refrain from crass comments like 'should've bought a real one'; this is intended to be a self-help thread for those of us who have this product.
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Old Feb 07, 2008, 11:12 PM
Pirouetting flip master
Malaysia
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as far as i have follow up on this topic, i have not heard any one confirmed that skyRC has release new revision for their chargers.
i also in the progress of looking up for a good charger and imax is in my consideration if they can balance the cell.
what about sharing with us your balancing result?
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Old Feb 08, 2008, 02:37 PM
Ted M
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Ann Arbor, MI, USA
Joined Feb 2007
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iMax B8 LiPo BALANCE mode

I have charged many 3S LiPos in LiPo CHARGE mode with the JST balance connector plugged in and I have monitored the individual cell voltages while charging. The charger brings each cell up to exactly 4.2 V indicated.

I've also tried the LiPo BALANCE mode a few times now, again with the JST balance connector plugged in. As far as my tests have gone, the LiPo BALANCE mode (that is not mentioned in the manual) seems to do exactly the same as the LiPo CHARGE mode.

I sent an email to skyrc yesterday but have had no reply as yet.
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Old Feb 13, 2008, 08:49 AM
Ted M
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No reply from SkyRC yet - It is the Chinese NY though.
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Old Feb 14, 2008, 02:38 PM
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Has anyone got hold of any PC software which works with this charger? I've been looking around but haven't found any at all!
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Old Feb 18, 2008, 04:57 PM
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Well, I have one coming as of last night. I was looking for a charger with more power than the 50W of the one I am using and the ability to charge LiFePO4 cells (that I don't have yet) and this one seemed too good to be real. Hope that old saying don't come back to haunt me. I was looking at the Mega Power Poseidon-860DS on the Hobby City website and stumbled accross the B8. The big selling point, for me, was that the firmware could be upgraded. As for PC software apparently LogView works with it, which is fine if you speak german. I hope that there is something else that will work with it too.
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Old Feb 18, 2008, 05:02 PM
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where do you get log view from?
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Old Feb 18, 2008, 05:10 PM
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http://www.logview.info/joomla/index...emid=1&lang=en
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Old Feb 27, 2008, 01:37 AM
Ted M
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Ann Arbor, MI, USA
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Quote:
Originally Posted by batman
Well, I have one coming as of last night. I was looking for a charger with more power than the 50W of the one I am using and the ability to charge LiFePO4 cells (that I don't have yet) and this one seemed too good to be real. Hope that old saying don't come back to haunt me. I was looking at the Mega Power Poseidon-860DS on the Hobby City website and stumbled accross the B8. The big selling point, for me, was that the firmware could be upgraded. As for PC software apparently LogView works with it, which is fine if you speak german. I hope that there is something else that will work with it too.
Well still no reply from SkyRC and I have to say that the firmware on the B8 seems flaky at best; there is clearly an issue with the button debounce software as you often have to press the buttons 2 or 3 times for them to work and then you may get 2 presses. It also seems that iMax have moved on to a new improved B8 http://www.hobbycity.com/hobbycity/s...idProduct=6443 which may be what we need for improved accuracy?

From my perspective, it looks like we've bought an early product that is now left behind by the manufacturers who appear uninterested in providing support of any kind; that doesn't give me a warm feeling about throwing good money after bad.
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Old Mar 05, 2008, 01:38 AM
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Im also interested in getting these but does anybody know if im able to charge Four separate 2S Lipo[7.4v] battery packs at the same time?
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Old Mar 05, 2008, 02:51 AM
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Quote:
Originally Posted by Kamov
Im also interested in getting these but does anybody know if im able to charge Four separate 2S Lipo[7.4v] battery packs at the same time?
Not specifically. It can only charge one battery at a time.

If the 4 batteries are the same capacity, then you could wire them in series and make a balancer adaptor plug and charge them as an 8S pack, but that would be tedious.
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Old Mar 05, 2008, 04:38 AM
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Quote:
Originally Posted by Gandalf_Sr
Well still no reply from SkyRC and I have to say that the firmware on the B8 seems flaky at best; there is clearly an issue with the button debounce software as you often have to press the buttons 2 or 3 times for them to work and then you may get 2 presses. It also seems that iMax have moved on to a new improved B8 http://www.hobbycity.com/hobbycity/s...idProduct=6443 which may be what we need for improved accuracy?

From my perspective, it looks like we've bought an early product that is now left behind by the manufacturers who appear uninterested in providing support of any kind; that doesn't give me a warm feeling about throwing good money after bad.

I think it is still too early to tell if this is "really" a improved version of the new B8.But a E-station BC8 is for sure a safe bet for your money but at twice the amount of money.
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Old May 30, 2009, 05:39 AM
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They have this charger now for $66.98 at
http://www.hobby-wing.com/imax-b8-charger.html

Im thinking about getting this one or two of these Thunder T6
http://www.hobbypartz.com/tht6smbach16.html

I have two 4s 14.8V 3000mAh lipos for my plane I I wonder if the iMax B8 with it being 150W will charge them individually faster than two of the Thunder T6 at only 50W

Cheers,
Chris
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Old Jun 18, 2010, 11:42 AM
'MAVERICK'
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how can I balance charger 2 cell 7.4V lipo batter from Imax B8 charger? Because balance charging socket starts from 3 cells..
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Old Jun 18, 2010, 11:47 AM
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jam the plug into one of the wider ones - eg the 4S slot. it will fit. make sure the black wire is at the edge.
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