its round and flat
It is not recommended to recharge a 3V battery with a 12V charger as this may damage the battery. The voltage of the charger should match the voltage of the battery to avoid overcharging and potential safety hazards. It is best to use a charger specifically designed for the 3V battery.
2032 3V Lithium Battery
at the store
CR 2032, 3V lithium battery
CR1616 - 3v battery
3V 2 Triple AAA battery's
Cr2016 3v
3v battery is used direct current
The difference between the two is the 2032 3v battery is just one battery per package. The 2016 3v are sold in packages of two. Therefore, the 2016 would mean you would have 2 batteries to use. One to replace the battery that has died and one to save as a back up or to put in a second remote for your garage door opener.
V=IR R=V/I V=3V I=0.075A R=3/0.075 = 40 ohms
No set answer to that, it depends on the size/capacity of the battery and what it's powering.
I'm not so sure..but give it a try..