Actually, it's probably 7 Ah (or amp-hour). That's 7,000 mAh. That's probably enough to do a complete recharge on a set of TX and RX batteries, along with a full day of starting with an electric starter, along with lighting a glow plug. I am using a 7 Ah gel cell battery in my flight box, and I have taken it out for two half days of flying inbetween recharges...although I admittedly don't use it to recharge flight batteries.

The short answer: yes, it's fine.