What battery will the old Time Master Calculator take--the listed eveready 357 has been redisigned and is too thick for this old calculator?

HP 10b Calculator requires two CR2032 Lithium batteries. The battery is 3 Volts, 3/4" in diameter and has an estimated life of three years. Replace the battery with CR2032 or an equivalent one.The following brands are used interchangeably for this item: Energizer (ECR2032), Duracell, Panasonic, Eveready, and 3M etc, which can be purchased from any local electronics store.


For further information you may refe to HP 10b Manual
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The TI-30Xa uses two A-76 lithium batteries. Comparable battery model numbers include:

Duracell® D357
Eveready® 357
Maxell® LR44
Varta® V13GA

To replace the batteries:

• Remove slide cover. Place calculator face down.
• Using a small Phillips screwdriver, remove screws from back case.
• Remove back case.
• Remove discharged batteries.
• Install new batteries positive side up, as shown on diagram inside case.
• Run a coin across the reset pad on the upper right hand corner of the printed circuit board.
• Replace back case, and then replace screws.
• Press [OFF], [ON/C], [ON/C].

Note: The calculator cannot hold data in memory when batteries are removed or become discharged.

TI-30Xa uses two A-76 lithium batteries. You can use a Duracell D357 battery, or an Eveready 357 battery.
Using a phillips screwdriver, remove the screws from the back case. Remove the back case.
Remove the discharged batteries. Install the new batteries with thepositive side up, as shown on the diagram inside the case.
Run a coin across the reset pad on the upper right hand corner of the printed circuit board.
Replace the back case Replace the screws. Press [OFF], [ON/C], [ON/C].

It uses two A-76 batteries. Some manufacturers call this the 357.

The TI-30Xa uses two A-76 lithium batteries. Comparable battery model numbers include: Duracell® D357 and Eveready® 357

The more common name for the 357 is SR44. Other common names you might see are LR44, A76, and S76, depending on the manufacturer. Any of those will work.

For up to 1000 hours of operation, use Panasonic
LR-44, Ray-O-Vac RW-82, Union Carbide (Eveready) A-76, or equivalent battery types.
For up to 2500 hours of operation, use Mallory 10L14 or D357, Union Carbide (Eveready) 357, Panasonic WL-14, Toshiba G-13, Ray-O-Vac RW-42, or equivalent battery types.
1. Remove slide cover. Place calculator face down.
2. Using a small Phillips screwdriver, remove screws from back case.
3. Pull off back case.
4. Remove discharged batteries.
Caution: Avoid contact with other calculator
components while changing batteries.
5. Install new batteries positive side up, as shown on diagram inside case.
6. Replace back case, and then replace screws.
7. Press ' ! !.
Battery Information
The BA Real Estate calculator cannot hold data in
memory when the batteries are removed or become discharged.

• Remove slide cover. Place calculator face down.
• Using a small Phillips screwdriver, remove screws from back case.
• Remove back case.
• Remove discharged batteries.
• Install new batteries positive side up, as shown on diagram inside case.
• Run a coin across the reset pad on the upper right hand corner of the printed circuit board.
• Replace back case, and then replace screws.
• Press [OFF], [ON/C], [ON/C].

The TI-30Xa uses two A-76 lithium batteries. Comparable battery model numbers include: Duracell® D357 and Eveready® 357

A76 or 357. They're the same thing under different names.

Hello,
I do not own this calculator and the manual does not specify the battery model number. However on this site, it is identified as EXP76. There must be many equivalent batteries.
The site shows you in pictures the whole procedure for replacing the battery.

Hope it helps.