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maraispc

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Topic: My Li Po is DOA.
Posted: 01/May/2010 at 6:05pm

Good suggestion - thanks!

Burnaby

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Posted: 29/Apr/2010 at 11:15am

Switch to the red bullets. Leave the iron on the bullets all day no bullet since it's all metal.

Not sure why everyone goes dean or xt60. I went all 4mm bullet for 450 and larger. Cheap too. HK supplies all 3000+ with 4mm bullets for a good reason.

My old iron with inadequate heat damaged a lot of deans, my new iron with temp control made dean soldering dead easy (too lazy to switch the old accucell lead).

maraispc

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Posted: 28/Apr/2010 at 3:01am

Don't rub it in

It was difficult enough to admit to myself that I'm not the soldering-expert I thought I was

rewolff

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Posted: 27/Apr/2010 at 4:58am

In hindsight things are sooooo easy. The accucell said connection break didn't it? Smile

maraispc

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Posted: 25/Apr/2010 at 5:12am

Ok everyone-I'm sorry if my post implied a problem with the ZIPPYs

With great embarressment I have to admit - the problem was not the Zippys or my chargers, but my soldering of the Deans plugs. I always used to put the male deans connector into the female deans connector when I solder the wires to the female connector. My thinking was that the extra metal will act as a heat sink and prevent the plates of the female connector from deforming.

Well it turns out that if you apply too much heat the plates melt into the plastic casing because the spring on the male connector pushes it into the plastic as the plastic melts. Although the plates are perfectly aligned upon completion of the soldering operation, the resulting connection is "loose" and the spring plate is no longer effective in providing a spring-loaded connection.

When I got a genuine deans connector (up to now my LHS must have sold me generic/clone deans) the packet has printed instructions that clearly state that one should not connect the male & female connectors during soldering!

maraispc

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Posted: 21/Apr/2010 at 4:10pm

Yes, I should have mentioned that. I used one of them to maiden hover my dad's HK450. I.e. I took the new Zippy LiPo & hovered for about 30seconds - no problems, the cell voltages dropped from about 3.8 to 3.7.

Lectric_high View Drop Down

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Posted: 21/Apr/2010 at 8:48am

Did they run yet? I was thinking cold solder joints but if they put out amps they should take them in.

Tolerance is the virtue of a man without convictions.

maraispc

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Posted: 21/Apr/2010 at 3:15am

I received two Zippy Flightmax 2200 11.1V 25C in February and they won't charge. Tried two different chargers - the hyperion charger show 'no battery' and the Accucel6 show 'connection break'. At the same time these chargers will charge any of my other LiPos without any problems.

The total voltage and voltages per cell seem normal for new packs (roughly 11.4V total and 3.8V per cell) - they just won't charge. I admit to having fitted deans connectors in place of the xt60s, but I know that I didn't short anything in the process (unfortunately this means that I can't return the packs :-(

nsgnsg

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Posted: 21/Apr/2010 at 2:33am

Count me in, too - got a DOA 2200 Zippy FlightMax the other day.

rewolff

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Posted: 06/Apr/2010 at 6:26pm

About 0.02 difference per cel sounds normal to me (you wrote 0.2V, but from your numbers it's more like 0.02). It's well within measuring error.

The charging process is supposed to put 4.2V on each cell, and then wait until the current drops to less than 3% of original current (or max current).

As there is always some resistance involved and always some current still flowing, the actual cell voltage MUST be lower than 4.20000 V. But in reality the measuring errors for the voltages for the different cells are much larger than the 0.02V difference you noticed.

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version
maraispc Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (ZA) USERID: 227016 Newbie Joined: 20/Feb/2010 Online Status: Offline Posts: 19	Quote Reply Topic: My Li Po is DOA. Posted: 01/May/2010 at 6:05pm
	Good suggestion - thanks!

Burnaby Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (CA) USERID: 164986 HobbyKing aficionado Joined: 04/Mar/2009 Online Status: Offline Posts: 944	Quote Reply Posted: 29/Apr/2010 at 11:15am
	Switch to the red bullets. Leave the iron on the bullets all day no bullet since it's all metal. Not sure why everyone goes dean or xt60. I went all 4mm bullet for 450 and larger. Cheap too. HK supplies all 3000+ with 4mm bullets for a good reason. My old iron with inadequate heat damaged a lot of deans, my new iron with temp control made dean soldering dead easy (too lazy to switch the old accucell lead).

maraispc Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (ZA) USERID: 227016 Newbie Joined: 20/Feb/2010 Online Status: Offline Posts: 19	Quote Reply Posted: 28/Apr/2010 at 3:01am
	Don't rub it in It was difficult enough to admit to myself that I'm not the soldering-expert I thought I was

rewolff Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (NL) USERID: 340356 HobbyKing Constituent Joined: 03/Dec/2009 Online Status: Offline Posts: 119	Quote Reply Posted: 27/Apr/2010 at 4:58am
	In hindsight things are sooooo easy. The accucell said connection break didn't it?

maraispc Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (ZA) USERID: 227016 Newbie Joined: 20/Feb/2010 Online Status: Offline Posts: 19	Quote Reply Posted: 25/Apr/2010 at 5:12am
	Ok everyone-I'm sorry if my post implied a problem with the ZIPPYs With great embarressment I have to admit - the problem was not the Zippys or my chargers, but my soldering of the Deans plugs. I always used to put the male deans connector into the female deans connector when I solder the wires to the female connector. My thinking was that the extra metal will act as a heat sink and prevent the plates of the female connector from deforming. Well it turns out that if you apply too much heat the plates melt into the plastic casing because the spring on the male connector pushes it into the plastic as the plastic melts. Although the plates are perfectly aligned upon completion of the soldering operation, the resulting connection is "loose" and the spring plate is no longer effective in providing a spring-loaded connection. When I got a genuine deans connector (up to now my LHS must have sold me generic/clone deans) the packet has printed instructions that clearly state that one should not connect the male & female connectors during soldering!

maraispc Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (ZA) USERID: 227016 Newbie Joined: 20/Feb/2010 Online Status: Offline Posts: 19	Quote Reply Posted: 21/Apr/2010 at 4:10pm
	Yes, I should have mentioned that. I used one of them to maiden hover my dad's HK450. I.e. I took the new Zippy LiPo & hovered for about 30seconds - no problems, the cell voltages dropped from about 3.8 to 3.7.

Lectric_high Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (US) USERID: 235410 Bargain Addict! Joined: 27/May/2009 Location: California USA Online Status: Offline Posts: 73	Quote Reply Posted: 21/Apr/2010 at 8:48am
	Did they run yet? I was thinking cold solder joints but if they put out amps they should take them in.
	Tolerance is the virtue of a man without convictions.

maraispc Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (ZA) USERID: 227016 Newbie Joined: 20/Feb/2010 Online Status: Offline Posts: 19	Quote Reply Posted: 21/Apr/2010 at 3:15am
	I received two Zippy Flightmax 2200 11.1V 25C in February and they won't charge. Tried two different chargers - the hyperion charger show 'no battery' and the Accucel6 show 'connection break'. At the same time these chargers will charge any of my other LiPos without any problems. The total voltage and voltages per cell seem normal for new packs (roughly 11.4V total and 3.8V per cell) - they just won't charge. I admit to having fitted deans connectors in place of the xt60s, but I know that I didn't short anything in the process (unfortunately this means that I can't return the packs :-(

nsgnsg Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (US) USERID: 5694 Newbie Joined: 08/Apr/2009 Online Status: Offline Posts: 7	Quote Reply Posted: 21/Apr/2010 at 2:33am
	Count me in, too - got a DOA 2200 Zippy FlightMax the other day.

rewolff Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (NL) USERID: 340356 HobbyKing Constituent Joined: 03/Dec/2009 Online Status: Offline Posts: 119	Quote Reply Posted: 06/Apr/2010 at 6:26pm
	About 0.02 difference per cel sounds normal to me (you wrote 0.2V, but from your numbers it's more like 0.02). It's well within measuring error. The charging process is supposed to put 4.2V on each cell, and then wait until the current drops to less than 3% of original current (or max current). As there is always some resistance involved and always some current still flowing, the actual cell voltage MUST be lower than 4.20000 V. But in reality the measuring errors for the voltages for the different cells are much larger than the 0.02V difference you noticed.