i,ve got 2 of the yellow one,s and have the same issue with charging ie as soon as you put it on charge the light turns green , another problem i,ve had is the internal hose from the pump gets kinked and restricts the flow of water to a dribble , ive changed the hose but it still keeps happening , its a great bit of kit when working but unfortunately thats not often enough , i think i will go with the more expensive shurflo next time regards alan