hi everybody,
im sorry if im posting something here which is already on these forums but im a newbie to this hobby and im not yet familiar with the terms yet.

i bought a big size VOLITATION brand helicopter from china last month i went there and it used to fly beautifully. bu tafter a few crashes im having major problems which include that it desnt fly anymore    :-

1) the balance bar which was two metal rods with weights on the ends broke and i bought a replacement from jhandewalan market here in delhi whch is slightlty about 2inches smaller. i think this is causing some kinda problem but i cant find the original lenght equivalent. can anyone suggest me some remedy for this please

2) there are two sets of wingsone on top and the other pair below they are marked A and B respectively. ive noticed that that lower pair doesnt spin as smoothly meaning when i shut down the throttle, the upper pair of wings comes to a stop smoothly but the lower pair stops more abruptly.

3) the battery doesnt seem to charge anymore. when i put it in for charge is shows red and stays red till ever. sometimes when i charge it is shows green but doesnt turn red. the battery seems to have a problem but i cant find a replacement because the replacement batteries in the market all have one single wire which is supposed to plug into the main borad of the heli. but my battery has two sets of wires... one goes into the main board and one connects to the charger directly. can anyone tell me please what this type of battery is called and if i should try to have the cells replaced or any other remedy?

thanks everyone