Yuav luag txhua lub roj teeb niaj hnub no tsis muaj mercury, tab sis cov hlau hnyav tseem yog ib feem ntawm mercury, rechargeable nickel-cadmium, thiab lead-acid roj teeb. Yog tias muab pov tseg tsis raug thiab ntau, cov hlau hnyav no yuav muaj kev phom sij rau ib puag ncig.
Tam sim no, muaj cov koom haum tshwj xeeb hauv ntiaj teb los rov ua dua manganese oxide, nickel-cadmium thiab lead-acid roj teeb.
