If a laptop its usually a shrink wrapped green sleeve with 2 wires red and black and connector on end, the silver cr232 (looks like giant watch battery) is a p.c. cmos battery, flips out if you push on two retainers ive just replaced my notebook rtc battery on a tosh a50 it involved taking full base of with a little memory of were screws go! as if wrong screw and to long nice lumps on inner of your lappy, last thing isolate either p.c. or laptops power including battery as to avoid damageing or killing your board easyiest way of understanding..............
You'll need to gain access to the top of the mainboard, here's a good guide: http://www.irisvista.com/tech/laptops/ToshibaM45/Satellite_M45_disassembly_1.htm In case you don't know, the cmos battery is a round, flat silver object, coin-like. Good luck!
Toshiba Satellite M45 M40 Tecra A4 disassembly guide
Take apart Toshiba Satellite M45...
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