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What are the differences between Primary Battery and rechargeable battery?

A primary battery is not intended to be recharged and is discarded when the battery has delivered all of its electrical energy.
A rechargeable battery is a galvanic battery which, after discharge, is restored to the fully charged state by the passage of an electrical current through the cell in the opposite direction to that of discharge.

What causes short lifetime of MINOLTA NP-500 Battery? How to prolong the lifetime of battery?

(1)Reason:
a.Charger or electro circuit can't be fit for the NP-500 battery.
b.Overcharge and overdischarge, etc.
c.Battery can't comply with the charging requirement.

(2)Solution:
a.Use the original charger.
b.Charge the battery after it automatically powers off , then full charge the np-500 minolta digital camera battery.
c.Avoid erroneous usage of battery, such as heavy pressure, short circuit, fall off and so on.

How many times can you recharge your MINOLTA NP-500 Batteries?

The number of times you can recharge your np-500 batteries will depend on the operating parameters, such as drain rate, battery care, etc. The life of a rechargeable np-500 digital camera battery operating under normal conditions is generally between 500 to 800 charge-discharge cycles.