9. Batteries

Don’t forget that typically, rechargeable batteries give you a lower voltage than non-rechargeable batteries.  The performance of rechargeable batteries is different from that of non-rechargeables.  As the Alkaline (non-rechargeable) battery discharges with use, its voltage decreases steadily.

NiMH and Li-Ion batteries start off with a lower voltage about (1.2 V to 1.3 V) than Alkaline (typically 1.5V for Alkaline).  However rechargeable batteries maintain the initial level until they are almost fully discharged.

Rechargeable batteries are more expensive but because they last longer, they are more cost-effective.  Rechargeables allow re-cycling so that spares can be re-charged while your other set is being used in your project.  Using standard batteries could be much more expensive (and a bit of a pain).


For all the information you're likely to need for hobby purposes, there is an excellent Adafruit article here: http://learn.adafruit.com/all-about-batteries