redtail

My Feedback: (15)

Hello guys, I have a Rcexl Twin Ignition System, Version 2.0. I want to use an A123 battery with a 6.6V with a 2500 mah.capacity. I am reading where if you use an A123 battery you need to add a voltage regulator. What is the truth. What A123 can I use - If I can use it at all? HELP. Chic

Truckracer

My Feedback: (19)

BarracudaHockey

My Feedback: (11)

Right from the manual. No regulator needed for the V2

2.) Selecting a power source.
4.8 and 6 Volt NiCd/NiMh Packs.
6.4 Volt Li-Fe(A123) Packs
7.4+ Volt Li-Poly Packs.

redtail

My Feedback: (15)

Thank you guys, forgot to say the voltage listed on the casing said: 4.8v to 6.0 Volts. So decided to use a 6 Volt NiMh Pack. Again, RCU is a strong and accurate source of information and advice. Using this battery to power a twin engine BME 115 ignition module that will power my Charlie Kellogg TBM Avenger that is being built here on the Warbird, Warplane Forum. Again, thanks. Chic

Truckracer

My Feedback: (19)

Well, those additional facts you just listed may change the answers! Lets be clear here, the revised ignition is called A-02 (should be printed on ignition label) and this is the version that allows for the increased voltage and AFAIK, this later version is the only one that will work properly on the increased voltage. The earlier A-01 version preferred voltages on the low end of the 4.8 to 6.0V range and some would overheat at 6.0. Before they came out with the A-02 version, they seemed to have made some changes to the A-01 that allowed for the higher voltages and these ignitions seemed to run best in the 6V range. Perhaps this later A-01 is what you have? At any rate, I'd stay with voltages within the range of what is marked on your ignition. A very easy way to accomplish this is by using a Tech Aero IBEC as it has a built in voltage regulator with multiple voltage ranges. A plus is you can get rid of the separate ignition battery in the process and you gain the ability to kill the ignition in flight from the transmitter.

redtail

My Feedback: (15)

Thank you for your follow-up. Will certainly follow your lead such that I will keep within the 4.8 to 6.0 volt range as marked on the casing. Again thanks. Chic

rcexl

Dear all
In this latest version, the minimum voltage is subject to the actual test. I use a 4.8V Ni-MH power battery and the actual capacity is (2000maH) for 1.5 hours of continuous operation. With 4.8V NiMH, the minimum voltage and actual test need to be considered, the maximum speed may be reduced, but the engine can run normally. Two A123 and two lithium-ion batteries are ideal. If using 3 A123 or 3 lithium-ion batteries. It is also very ideal. Up to 12V lead-acid batteries (up to a maximum charge voltage of 14.4V). The higher the voltage, the smaller the current will be. We use the latest design to maintain a certain power.

My bad English, please forgive me.

Rcexl team

acdii

I was just contemplating this almost same question. Bought two Saito FG-30 for my B-25 and they have the latest 4.8-8.4v ignitions. So LiFe or LiPo and what mah rating would be ideal? I will have one dedicated pack per engine.

BarracudaHockey

My Feedback: (11)

I prefer LiFe, they are more stable, dont require removing to charge and you can leave them fully charged and they stay that way for ages

acdii

oh, right, forgot about charging a LiPo. That would be a royal pain, would have to remove the cowl and firewall to get at it. The more I think about it, the more I realize putting them in the nacelles may not be that great an idea. I also have the power switches to deal with. I think there is enough room for 4 LiFe packs in the forward fuse. Now, just have to figure out the MAH size.

BarracudaHockey

My Feedback: (11)

I'd size according to weight needed. I was running a 50cc DA ignition and 5 high power servos spanking it in a 3D msx-r and it ran about 325mah per flight. If ignition only used over 100 to 150 per flight I'd be surprised.

acdii

On my FG-11 I use one LiFe for both RX and ignition, but it is on a small plane with standard servos. Not taking any chances with the B-25, each engine will have it's own pack, and the RX will have 2. I had an issue with NiMh with a cell dropping out causing the DA-100 to quit and the plane went in. Don't want a repeat.

BarracudaHockey

My Feedback: (11)

Ahh yes, I don't blame you.