Casio Fx 991ex Battery Replacement

Battery Capacity Calculation:

\[ \text{Replacement Capacity (mAh)} = \text{Original Capacity} \times \text{Multiplier} \]

Replacement Battery Capacity:

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1. What is Battery Capacity?

The original LR44 battery for Casio FX-991EX calculators typically has a capacity of 30 mAh. When replacing, you may want a battery with higher capacity for longer life.

2. How Does the Calculator Work?

The calculator uses a simple multiplication:

\[ \text{Replacement Capacity} = \text{Original Capacity} \times \text{Multiplier} \]

Where:

Original Capacity — Typically 30 mAh for LR44
Multiplier — How many times more capacity you want (e.g., 2× for double capacity)

3. Importance of Proper Battery Replacement

Details: Using a battery with appropriate capacity ensures your calculator functions properly and maintains the correct voltage requirements.

4. Using the Calculator

Tips: Enter the original battery capacity (30 mAh for LR44) and your desired capacity multiplier (e.g., 1.5 for 50% more capacity).

5. Frequently Asked Questions (FAQ)

Q1: What's the standard capacity of LR44 battery?
A: The standard LR44 alkaline battery has about 30 mAh capacity.

Q2: Can I use higher capacity batteries?
A: Yes, as long as they maintain the same voltage (1.5V) and physical size.

Q3: What battery types can replace LR44?
A: Equivalent batteries include AG13, A76, 357, SR44 (different chemistry, check voltage).

Q4: How long does the original battery last?
A: Typically 1-2 years with normal use in a scientific calculator.

Q5: Does higher capacity mean larger size?
A: Not necessarily - lithium batteries often have higher capacity in same size.