NiCd Rechargeable Battery AA 1.2 V 800mAh is rechargeable batteries, something important to keep in mind when choosing any size NiCd, is that this type of chemistry is susceptible to experiencing what is known as the “memory effect”. Memory effect (also known as battery memory) happens when a NiCd battery is not fully drained of power before being recharged. If it’s recharged prior to a depleted power state, (prior to being “dead”), the recharging process only “tops off” whatever power is missing and this then, becomes the new, total capacity of the battery. You will be able to have approximately 500 FULL charge cycles on a NiCd battery, if you recharge it only when it is completely empty. To be sure of if there is any power remaining in your NiCd batteries before you recharge them, it’s best to own a Battery Tester. This inexpensive and handy gadget will prove to be invaluable to you, in determining when your batteries are truly depleted. In this way, you will not subject your NiCd’s to memory effect and will benefit from the full power of each life cycle that the manufacturer intended.