How does one strip the Braun series 5 Electric Razor to replace the Batteries?

Cant say i have done it to this model , but I have done procedure for a Phillips model , there may be a screw , but mostly they pull apart like a remote for a television , internal clips / self locking , strong finger nails can do it , or a plastic pry tool to leaver it apart carefully , it's a finesse things , & sometimes patience lol , now for battery , not sure on this model , they usually have 2 x AA rechargeable batteries inside them , but they are cross soldered together to double voltage , there is also a wire soldered from device to battery terminal , buying the same type of battery and quantity , 2 X AA rechargeable etc.. you can solder them , be sure to firmly scratch top and bottom of batteries before attempting to solder them , take notice of other batteries and connection's , use a guide to solder new one's in, experience soldering is required ,