JR 9303 TX battery with a Thunder Power Liop 20C 2100mah????

[cliffp73]

What would be the pros and the Cons of using a Thunder power 2100 LiPo battery in my JR 9303 Tx? I just put one in with a deans connector and my balance plug also. if you are looking at the back of the TX i put the connectors on the left side if you are looking at the back. I would put a deans large connector and then a jumper from the large deans connector and then to the JR input connector that way I can rotate my battery out with my Trex and Mini Ultra Stick batteries. Or I would just add a JR end to the battery and just use the balance plug to charge it with my Cell Pro 4s Charger. What I am trying to do is find out what the cons would be by doing this. Could I charge it with my Durarax Ice charger using my TP LiPo setting to charge it through the charging port on the JR TX. I know that the pins politary is reversed on the JR. It took me reading a post 3 time to figure it out and then I tested it and yep it was reserved.

[cliffp73]

So is this that good of an idea that there is no comment needed? Is it such a bad idea that not comment is needed? not everyone at one please. clam down..... no shoving.

[eyeflyhelis]

heck i think its a good idea. you never let id drop below 10v anyway right?

[cliffp73]

no and I would be able to see it the whole time. i am sorry for the last post but I just wanted to see what I was mising because there is always something worng with what I come up with. And this one sounded too good to be true to me. Thank you very much for your reply.

[DavidH]

There is a few pilots using LiPos to power there transmitter. But I would never charge the LiPo with it still installed in the transmitter. That is a good way to buy a new radio. The charge receptable on the JR is the only thing that is opposite other transmitters. Center pin is negative, outer shell is positive on the JR transmitter charge receptable. The battery is wire positive to positive, negative to negative.

If the radio will not operate. Check for a blown fuse on the circuit board. Common occurence with JR radios that have the fuse protection.

David

[cliffp73]

That you for the blown fuse line, I will remmeber that.
As for charging I would much rather use the blance plug on my tx to charge it and I forgot about the not charging in the TX. I would take it out to charge it if I were to use thei battery. I thank you for that advice. Is there anything else that I need to look out for? I wonder how long it will last? I thank everyone for the post and it just poped in to my head wne I was looking around the other night for a lipo to fix and thats when I thought about what I already had. I don't want it to go below 10v right? I am about to die to find out how long it will alst for some reason. I have a 2500mah nmih in it now and it does ok. The battery was a cheap one so I only have like 1700 mah that I can use I think or was it 1250. Well anyway it was badddddddddd. But better than my 700 mah that came with it. Now where can I find a battery door for my 9303. I want to try something else. Does anyone know which ones will fit it and if so where and how much. I thank everyone for helping me when I ask a question on this board. Very helpful and I haven't been bashed for asking a dumb questions. Thank you everyone.

Cliff

[DavidH]

Horizon Hobby or Radio South should have parts for the 9303. Also you need to check the battery with a Volt/Ohm/ meter to make sure the volt meter on the radio is reading correctly. Fully charged the 3 cell Lipo should be better than 12 volts, You should be able to use the battery down to 10-9.9 volts.
The 2100 mah LiPo is going to give you less usable time than the 2500 mah you have in the transmitter now. A 2500 mah battery should operate a 9303 for 7-8 hours continously at least. I used 1300 mah Li-Ion batteries in a 9Z and it would operate 5 hours continously.
Don't know why you want to put a Li-Po battery in a transmitter that has less amp hours than the battery you have in there now.

David

[cliffp73]

I would rather hve one type of battery if I could I have the cell pro 4s and LOVE IT, if I could just have one small charger and all lipo batteries that would be great. The reason why I would change out my 2500 NiMH for my 2100LiPo is my 2500NiMH only holds like 1300mah and the 2100LiPo has 2100 in it. I just can't seem to be able to get my 2500 to take a great charge. I might be doing something wrong. I am very new to my DuraTrax Ice charger. So if someone might know what setting I should use with my 2500 NiMH with the temp sensor pleas let me know I will discharge it and recharge it with thoes settings to see how much I actually have in it. And if you might have a list of settings that I should use on different batteries that would be nice also. I understand the cahrger about 75% and I do know what I want done, but I don't know that I am doing everything right. Thanks again.

[Pinecone]

a) A Dean's Ultra connector is overkill.

b) A 20C lipo is OVERKILL.

The Tx draws maybe an amp on a bad day, more like 200 - 300 mA. A JST would work fine, with a 1C lipo. :)

The thing stopping me from going to lipo is that every so often I forget to turn the Tx off. And that would kill a lipo. Maybe use something like one of the lipo guard devices to shut off power when the lipo gets too low.

Better, for me, is a high cap NiMH pack. I have a 2700 in my 9303 right now.

WRT to charging the NiMH pack, I have found that some Tx packs do not like fast charging, the one I had in my Hitec Eclipse 7 would not take a charge at over 0.5 amps or about 1/4C- 1/5C.

[DavidH]

The reason why I would change out my 2500 NiMH for my 2100LiPo is my 2500NiMH only holds like 1300mah

When you get a nimh battery. It needs to be cycled several times till it will reach its rated capacity. If you just got the battery new and did not cycle it, that is the problem. Take the battery and cycle it. Charge it up, discharge it, and repeat. Each time seeing how much mahs it takes. You may be able to get it back up to its rated capacity.

David

[cliffp73]

I will do that and thank you very much, I really would rather stay with my 2500 NiMH and I think that it will do a much better job in the long run, I too am one that would leave my TX turned on. Thank you both for the information.

[rcmarty]

The tp 2100's don't fit all that nice (9303) but rather tight.

I bought the truerc tx lipo packs for mine. Fits in with room to spare (put a velcro strap on 3 sides a bit if bubble wrap under it to keep it from flopping around). It has the jr end on it (white) and balancing taps.

Being the wires are small i didn't want to charge through the leads (18 guage) but the balancing tap fits the eflight blade chargers with a few swipes of the exacto and a repinning of the leads. The chargers are cheap and i think they charge each sell sereratly.

There about $30

Martin :)
truerc.com

[cliffp73]

Thank you marting, may I ask where you got your from or where would you buy one from? That is about the price and size I am wanting. I thank you very much.

Cliff

I just say truerc.com I will try there and I bet I will be able to find it there.

May I ask which model number pack you bought?

[rcmarty]

here's a link

http://www.truerc.net/canada2/readypacks/readypacksca.html

Martin :)

[mrhook]

With the nmhd pack you need to cycle a few times at a low discharge and charge rate as stated before. I charge my 2700 at .5 and discharge at .5. Also make sure your charge leads are no longer than 8 inches, long leads create in line resistance and that can also false peak your packs.

[cliffp73]

I thank you very much for the information. I will look it over again.

[kgfly]

The main advantage of a lipo Tx pack is that it holds its charge for a long time so even if you haven't flown for weeks you can just grab your Tx and go. NiCd/NiMH have high self-discharge and so it is always a good idea to remember to recharge the night before you want to go out and fly. Smaller benefit is the lighter weight.

The main disadvantages of a lipo Tx pack are the risk of killing the battery if you forget to turn your Tx off and a higher fire risk than NiCd/NiMH.

The 1C Tx lipo from truerc is the best deal around, especially nice since you can order it with exactly the right connector for your Tx.

[MAXXED]

I thought a li-po pack was a great idea, too.
Unfortunately, as pinecone mentioned, I forgot to turn it off and killed the li-po after only one use. :roll:
I completely forgot about the fact that my JR 9303 has no low voltage cutoff sensor for li-pos, as it was never designed to run them.
The battery gauge on the LCD display really won't tell you when you're in the danger zone, and I can't see pulling the pack out and constantly checking it with a voltmeter.
I replaced the li-po with 8 AA Sanyo 2700mah nimhs, and they will run for hours.
I no longer need to worry about leaving my radio on, too.

[rcmarty]

Sorry i don't follow how taking out the lipo pack and measuring it with a voltmeter would do anything more than turning on the tx and reading the voltage displayed.

I guess leaving the tx on is one drawback.

Worth noting unless you leave your pin up all the time your risking shooting down a fellow flyer at the field.

I include checking my transmitter as part of my landing flight check (for lack of a better words).

For myself i just remember to charge the lipo very month to month and a half :) (flying every weekend)

Martin :)

[Helipilot48]

I put a 2100mah lipo in my 9303 and it works great got it at ( Common Sense.com). I see that Horizon Hobbys is selling one now. I run mine down to about 10.8 then take it out and charge it again i get about 3 to 4 weeks on it before charging again. Thats about 16 flights a weekend 5 to 6 mins per flight.