Yep, IMO, you need better. May I suggest that you go down to the local Walmart or Radio Shack and check out the stock. I have a number of such chargers. If you have the normal 4 cell, "4.8" battery, you can do very well with a charger that puts out 6-8 volts and 200 - 300 mah, a few up to 500mah. Never read the output of a charger from a hobby radio package. Check the actual output in the fine print on the charger, normally called "power supply" or "converter" in the real world. I have a couple chargers that have adjustable polarity, and 1.5 to 12 Volt output with multiple size selectable polarity transmitter tips. These come in handy.

The good point is if you watch the sales, especially at Radio Shack, you can get them from 50 cents to leass than $5. I think maybe that is where hobby suppliers get theirs and sell to modelers at 3-5 times what they pay.

One other point is that many chargers for NiCads and NiMah batteries list the output as the 4.8V radio standard. These batts charge to 5.5 to 6 volts. You cannot pack the electrics into a batt. with 4.8V charger. You have to have higher voltage to fill the battery.
Don't let deceptive trade practices lead you into not properly charging batteries. [8D]