I play golf often, at least three times a week, now that I'm retired. I purchased a Garmin GPS device to use on the golf course (good device) but was only getting about three rounds of use before I had to replace the 2 AA batteries. I started searching for a good but reasonably priced AA battery recharging unit. The Sony charger (Sony BCG-34HRMF4 Battery charger with LCD display) fits the bill. I still only get about three rounds usage from the rechargeable batteries, but I'm not buying tons of alkaline batteries. The only draw back I have found is the shelf life of the recharged batteries is not good, but for my purpose this unit is the answer (a good buy).