jerrybern

How do I use 2 batteries, What do I need to buy?
I am using a Futaba. 10 J with High-tech servos, and a Demon cortex gyro with a NiMH 4200 ah at 6 volts
Thanks,
Jerry B

paulhat

So many different solutions out there.
Something like this is a good example - https://www.powerbox-systems.com/pro...mpetition.html
Plug 2 batteries in and the powerbox treats them as individual batteries. If one battery dies the other takes over.
Lots of other brands like AR, Jeti, Futaba, Emcotec etc.

Here is another variant from AR -https://boomarc.com/en/ar-reg-switch
This one is a simple battery backer. It just depends on what setup you are going for I guess.

Oh and I know everyone has probably told you this but get rid of the NiMH.. LiFe or Lipo are heaps better.

PaulH.

Len Todd

Unfortunately, many of the potential options are out of stock. If you are in a hurry, you may have to settle for one generation older tech. However, if you are thinking Powerbox, I would recommend a Mercury. It has the Gyro built in and has multiple battery and Rxer inputs. I have several in jets and giants. Smoothflite also has nice setups too, if you can get one. Look around, there are several options.

I have tried and researched several different setups and have settled exclusively on Powerbox Mercury SRS, for now. I have at least 5 PBoxes in the fleet. In my experience, nothing beats a PBox Mercury SRS with at least 3 remote Spektrum SRXL Rxers. I have been using PBox for several years.

However, you are using Futaba. I am NOT familiar what you would use in a PBox for the multiple Rxers with Futaba. Larger models not only need multiple power sources, but also need multiple Rxers. Some power distribution systems offered may not be capable of handling several Futaba Rxers. Some models only allow one Rxer.

There are also some battery combining devices out there that do NOT involve multiple Rxers, etc. However, they just combine two batteries and do not regulate the voltage. Regulating voltage is important for larger aircraft and when you are using Low Voltage servos, etc. Today's larger planes need LiPo batteries, High Voltage servos and multiple receivers as well as lots of battery power. The chain is only as strong as the weakest link.

Look closely at what you are buying before you pull the trigger. Make sure you are getting what you need or may need in the future. Hopefully you can get your hands on what you want in a timely manner.

seanreit

My Feedback: (60)

20 years ago before all the new fancy stuff, we used NICAD and/or NIMH, 2 batteries with a splitter. It depends on what your concern is, more AMPS or protection from failure. Splitter isn't necessarily a backup. Used to hot swap batteries using a splitter to hot fuel and keep flying. When using the older FM systems, you basically became the freq clip guy:

George

My Feedback: (57)

Just what you're looking for from Futaba and in stock.

https://futabausa.com/product/dlph-1/

FenderBean

Futaba has a power distribution hub now perfect for this.
https://futabausa.com/product/dlph-1/

FenderBean

lol man crazy timing

George

My Feedback: (57)

Beat you to it!

jerrybern

what's the reason for not use NiMh batteries
Thanks
Jerry B

rhklenke

My Feedback: (24)

They have a lot of internal resistance and thus don't handle high current loads very well. For a smaller jet, they're probably OK, but for a big jet with a number of super high torque servos, they are a poor choice. Also, they are much heavier for the same capacity...

Bob

Zeeb

My Feedback: (41)

They also have very high self discharge rates, are prone to "false peaking" off the chargers, require a much longer charge time at 1/10th C and have a drastically smaller discharge capability rate than say LiFe's.