Recommend a charger plug for the Devo 6s

I've read all the debates etc, and I am going to use eneloops in my Devo 6s. I would like to charge them in the devo. I need to buy the cord to plug into the charging port. What is a good one? I have searched several forums, and haven't found a single recommendation.

Please don't recommend I switch to another battery type, I am not looking to drop a wad of cash right now on batteries, chargers, mods, etc. I just want to fly.

As a bonus, have this splash screen I made...

My charger is radio shack "enercell" 9v, 300mA, using the "M" end (5.5 O.D. x 2.1 I.D). Works on the 6S and 7e.

I use one of these ( www.amazon.com/gp/product/B00452YFZU?psc...ui_search_detailpage ) for both my 6S and 10.

Now that I'm piloting yachts more often than battery-sucking aircraft (> 4 hours of run time!), the Tx running out of power at the pond is becoming an issue. So I bought one the enercell car adapter from RS, with the M end to use on them.