Best non lipo replacement battery for DX7?

[brovic777]

I want to get a longer lasting DX7 battery without converting over to lipo that will fix the current stock setup.

Any suggestions?

Thanks

[fireup]

I picked up an 8 pack of these 2500 mAH from HomeDepot for $18 and solder one up myself. Works great, almost double the capacity and don't need special charger and safer then Lipo.

[brovic777]

I picked up an 8 pack of these 2500 mAH from HomeDepot for $18 and solder one up myself. Works great, almost double the capacity and don't need special charger and safer then Lipo.

I think I have a set like that laying around. Is there anything special that needs to be done for soldering?

Also, u using the stock charger on the DX7.

How exactly do you have it wired up?

Thanks Kevin.

[fireup]

I just solder them end-to-end in series with 7 pieces of 1 in. long wires, then use tape and hot glue to hold them in place.

Sanding the end of the batteries a little help solder sticks to them easier.

Use the stock charger to charge it up.

[HFG]

i use NO BS batteries in my 9303. I believe they carry stuff for DX7 as well

[Skiddz]

+1 on the NoBS packs.. Great deal and the packs fit like they were made for the Tx.. (Which is nice becasue they are)

[brovic777]

+1 on the NoBS packs.. Great deal and the packs fit like they were made for the Tx.. (Which is nice becasue they are)

Where can I get these NoBS packs?

I want to compare them to the ones Kevin posted.

Thanks

[HFG]

http://www.hangtimes.com/txpacks.html

[brovic777]

http://www.hangtimes.com/txpacks.html

Which one are you guys using?

[raycsr]

I have a JR pack 2500mah NIMH. Actually this was sent to me by Horizon Hobby as a replacement for the factory battery on my DX7. The factory pack that shipped with the DX7 was damaged.

[HFG]

i use a 1650mah which lasts about 8 hours on the 9303. Thats long enough considering it only takes 2hours to recharge.

[brovic777]

I just solder them end-to-end in series with 7 pieces of 1 in. long wires, then use tape and hot glue to hold them in place.

Sanding the end of the batteries a little help solder sticks to them easier.

Use the stock charger to charge it up.

Kevin, how long do I have to charge the 8 rechargable batteries? I got 8 2500mah AA Energizer's.

Thanks

[Funky]

I have been using these in both of my radios for about a year now. They work great and last MUCH longer than the stock batteries.

http://www.jrradios.com/Products/Default.aspx?ProdID=JRPB5011

[brovic777]

I have been using these in both of my radios for about a year now. They work great and last MUCH longer than the stock batteries.

http://www.jrradios.com/Products/Default.aspx?ProdID=JRPB5011

I was looking for those before and did not know where to look Funky.

But now, thanks to Kevin (Fireup) I soldered the 8 Engergizer 2500mah batteries that cost really cheap, and my DX7 stays at full charger long now. Amazing.....

http://i118.photobucket.com/albums/o91/******777/Pics2/IMG_4061.jpg

[Dave M]

just be careful with the duct tape...some of it conducts electricity.:shock:

[brovic777]

just be careful with the duct tape...some of it conducts electricity.:shock:

Hmm. I never heard of that.

[Kinta]

Why dont you get a 8 'AA' battery holder and 9V battery connector from radioshack and put that together. Much easier and no solder :-D. Only cost an extra 4 buck or so.

[0636]

Best to charge NiMH with C/10 for 14 hours. You don't need to worry much about overcharging battery at such rate.

Means with 2500mAh battery you will need 250mA charger. With stock 110mA charger you need to double that time (kind of slow).

If you want to use higher charge rates you have to monitor temperature and negative delta V (the last one is less pronounce in NiMH chemistry, so you better do with timing method)

I'm using TP1010C with 2.3a firmware and 0.3C current for 4 hours.

With TP1010C you may want to discharge it down to 0.8V per cell first.

[0636]

Battery holder springs sometimes will get oxidized contacts (unless they are made from gold) and will jitter power. I think soldering is much more reliable in that case. (You don't want power to jitter during flight)

Why dont you get a 8 'AA' battery holder and 9V battery connector from radioshack and put that together. Much easier and no solder :-D. Only cost an extra 4 buck or so.

[brovic777]

Battery holder springs sometimes will get oxidized contacts (unless they are made from gold) and will jitter power. I think soldering is much more reliable in that case. (You don't want power to jitter during flight)

Well, I took my time in the soldering process, so it should be a really solid connection.

[Helifarns]

So you connect one battery to the next with solder/wire........how does the white plug wire get solder to this new pack?
Can someone explain the soldering technique for putting together
batteries like this?
Sorry, I am a newb when it comes to battery soldering. :oops:

[brovic777]

So you connect one battery to the next with solder/wire........how does the white plug wire get solder to this new pack?
Can someone explain the soldering technique for putting together
batteries like this?
Sorry, I am a newb when it comes to battery soldering. :oops:

If you are new to soldering you might want to maybe just buy one of the packs listed on this post instead. If you don't do it right, and your solder connections arn't good, it can be dangerous when your flying if your transmitter gets a short in the connection.

But, if your up to it, just solder the 8 batteries series with one inch wire as Kevin mentioned. Or you can make it easy for youself and buy one of there battery trays.

http://www.servocity.com/html/battery_trays.html

http://www.servocity.com/assets/images/58101.jpg

[Helifarns]

Thanks, I can solder well, I am just trying to visualize heating up the ends of the battery. So ya solder one end on, then solder the other end of the wire to the next battery, then just sort of twist and fold the wire around the ends of the batteries?? I gotta see how the + and - ends are lined up.

[brovic777]

I just soldered them end to end, till all 8 where done making a long snake. Then just twisted them around to form the size of the battery compartment. Wish I would of took pics before I taped them all together, but I just kinda figured it out by playing with the best way to make the batteries fit.

If I get time tommorow, maybe I'll take them apart, and do a quick video on the whole setup procudure.

[Helifarns]

I see, that makes a little more sense now!!! Naw, don't take it apart.....I think I can figure it out.
Thanks! :thumbup: