DX7 Lipo Conversion and Battery Alam Settings

How to convert your Spektrum DX7 (Heli for the video) to a 3 Cell LiPo Battery and Adjust the Low voltage Alarm.

Category:

Howto & Style

Tags:

• Spektrum
• DX7
• LiPo
• Battery
• Voltage
• Alarm

[GreenMountainRC]

It is true that it is more than recommended voltage, some forum threads suggest capacitors, or swapping voltage regulators. Apparently with the proper heat sink the voltage regulators can handle it. I know people that have been using lipos without additional mods for over 3 years without issue. But again as the manual says it WILL VOID your warranty

[MrLupold]

Thank you for the great how to video!

big help for the new lipo guy's

keep flying!!!

[MattReedVT]

@Purepain76 Also, Even changing it to 10V leaves you at 3.3v per cell. they do make a diode or other things you can do to drop the voltage down so it Alarms properly, and more closely matches the voltage of the NiMH battery. But if you watch the reported voltage on the screen while running and just charge it when it gets down to 11v you'll be fine.

[MattReedVT]

@Purepain76 Any 3s will do for the DX7, there isn't anything you HAVE to do to make it work. All the components inside are rated to handle the extra voltage, The concerns of others are the Voltage Regulators don't have large enough heatsinks on them to handle the extra current, but in practice they seem fine, I've had years of flying on the LiPo from 20deg F to 90-95 degF with no issue, but if you dont change the alarm you could drain the lipo even further than you should (3v per cell).

[Purepain76]

Hi I was wondering if I can use a regular 3s 2200 mah lipo pack in my Spektrum DX7 providing I solder the proper lead onto the lipo pack ? Also wanted to know if there is a setting for using a lipo battery pack that I have to select when I change over to a lipo ? Thanks and great video lots of useful tips

[johnfranks]

nice, clear instructions!

i flipped the coaxial power jack 180° making accidental wall charging impossible. can be easily reversed if desired.

-jfc 

[Nandox7]

On my Futaba 9 I started using a LiPo 3S as well.

But because there is no way to alter the alarm I ended up using a diode to limit the

voltage that enter the radio and still have it warn me way before the low voltage damage the lipo.

For the DX7 I'd recommend the same, if you can get a ~1 - 1.5v voltage drop it will more than enough to make it safe and we can still enjoy the wonders of a long lasting LiPo.

[macdaddy1600]

NICE VIDEO THANKS

[macdaddy1600]

how long did you wait to get your battery

[macdaddy1600]

@Mateyhv1 4 guys got dx 7s they all have lipos in them no problem at all over 2 years everything is fine YOU CAN YOU A LIPO PACK IN YOUR DX7

[macdaddy1600]

I GOT A NICE USED DX 7 HELI WHEN I WAS PROGAM MODE THE SCREEN WAS BLINKING I THENK THE BATTERY IS BAD ITS NMIH HOW LONG DOES IT TAKE TO CHARGE ALL NIGHT