I am having a problem with my dual redundant system. i am using a futaba PCM receiver and two 6V 1500mAh NiMh packs. Each pack has its own Cermark HD charging switch. One switch/battery is plugged into the battery port and the other switch is "y'd" to the choke servo. I am charging with an accucycle elite. The elite will charge both packs at the same time when I connect the charger directly to the batteries (bypassing the switches). It will also charge the packs individually through the switches. The problem I am having, is that as soon as I connect the charger to both switches and attempt to charge both packs at the same time (through the switches), I get an overvoltage error. I have read some of the posts down lower in this forum and seems to have found my answer- both switch/packs have the same common ground right? So my charger has a problem with this?
In the meantime, I have ordered a battshare from the smartfly website, and am wondering if that will solve the problem. With the battshare, does that isolate both systems such that I will be able to charge both at once using the switches?

Finally, I am obviously using dual packs to provide extra safety in the event of failure. What happens if the battshare fails? what will the packs do?

Hello,
I do think you are running into the common ground problem. The BatShare will not solve this as it also has a common ground inside it. There is really no way around this other than
charging one battery at a time or taking at least one battery out of the system and charging it separately.
The BatShare has two independent diodes in it, one for each battery. A diode will fail as an open (I have not ever seen it happen on a BatShare but that is how they fail) so the other diode will be unaffected and continue to supply voltage to the system.
Let us know if we can be of further assistance.

Thanks for the info. I figured it was the common ground thing. As mentioned, I ordered a battshare from your website. I am not sure I really need one since both packs are the same capacity, but i will probably use it anyways. Thanks again.

Hello,
If you want to cancel the order that is fine. Just e-mail us.

I think I will cancel. Thanks for the information.

Hi,
OK, I found the the order and will cancel it.

Thanks for your honesty. I haven't seen many companies that actually tell you when you don't really need one of their items. I appreciate your help and will definately use your products next year when I upgrade to a larger plane.

Hi Steve,
I just do not believe in selling you something you don't need. I knew this would not solve your particuar problem so unless you wanted it for other reasons you might as well save your money for something you do need.
Thanks,