you may be right...but what about the lights that recharge cell IN the light? there is no cord to dissapate for them?
If you look at HKJs tests you will see that the charging unit generates a lot of heat. Most of them are powered by a wall wart, simailar to the PSU that powers the in-light charger. The heat in the in-light charger is dissipated by the light, which is hopefully made of aluminium.
Anyay, this detracts from your original question, there don't seem to be a lot, if any, wall chargers around for Li Ion cells made by reputable manufacturers. There is probably a good reason for that. i've suggested one that may well be wrong.
Another reason may be the variation in AC socket types round the World. If you make a corded charger the wall wart can be bought in and added to the package to suit the various outlets.
P