[. . . ] When the battery's performance in the device becomes noticeably diminished and operation times fall well short of the device's specifications, then it is time to change the rechargeable battery and buy a new one. Purchasing a Rechargeable Battery When purchasing a replacement, or spare rechargeable battery for your device, it is VERY IMPORTANT that you choose the correct battery and that you only use Transcend approved batteries and chargers. Always follow your device's manual or appropriate reference material instructions for replacing the new battery. General Safety Precautions Only use rechargeable batteries with the specified Transcend equipment. [. . . ] Do NOT attempt to open, dissemble, modify, or short-circuit a battery. Accidental short-circuiting may occur if a metallic object causes a direct connection between the battery's + and ­ terminals. Do NOT expose a battery to temperature extremes; this will affect the battery's performance. Battery Usage Requirements Always refer to your Transcend User's Manual or appropriate reference material for instructions on how to replace a battery. Try and charge a battery in an ambient temperature, preferably room temperature. Please take Note of the battery's min/max temperature range of operation. With the case fully unclipped, you can now lift the back cover of the case off of the T. sonic. Lift up the old battery from the green electronics board, *PLEASE* pay close attention to the alignment of the battery on the board as you will need to position the new battery into this space. Gently pull out the battery cable power connector from the T. sonic's power socket. Plug the new battery's connector into the unit's power socket. Having paid close attention to the original battery orientation, place the new battery into the same position as was occupied by the old battery on the green electronics board. [. . . ] Plug the new battery's connector into the unit's power socket. Having paid close attention to the original battery orientation, place the new battery into the same position as was occupied by the old battery on the green electronics board. [. . . ]