ORIGINAL: propnuter

I have had about 16 flights on my majestic 40 using the 1100Mah A123 battery pack charging with the FMA Cellpro 4s balancing charger.

So far so good.
The plane uses 300-325 Mah per flight and I am charging after 2 flights. The charger has two displays one of which displays the remaining battery fuel as a %. I don’t use this as I don’t think it is accurate due to the flat discharge curve of the A123’s. Instead I just monitor how many Mah are required to charge the battery back to 100%.

The charger needs a 5AMP power source which means you need a big field battery to recharge. The batteries are charged at 4AMPs and it takes about 5-8 mins to charge and balance itself.

Every battery has some disadvantage. In the case of the A123’s not being able to check the battery before flying is an inconvenience. However I think it just requires a change of mind set and more disciplined charge monitoring.

I will try it in my F3a model in a few weeks time.

Shane