Astro-Physics
GTO Keypad Battery Information

Keypad Serial Numbers 1565GTO and Lower (assuming the main PC board has not been replaced)

Battery for 256K Memory

Symptoms: If your keypad object database corrupts repeatedly, the battery needs to be replaced. What is a corrupted database? If the data (magnitude, coordinates, object type, etc) for the catalog objects is way off, the database is corrupted. You will often notice this first if the keypad displays "Object below the horizon", when you know that it is not. Slews to the stars and planets will be correct since they are not stored in the same location. E0310 Battery in Clip Holder


Battery Specifications: 3V Lithium battery. Battery life is estimated 5 years at room temperature, however we have found that they last much longer. This battery is held in place by a clip as shown in the photo at right.

Replacement battery: Renata CR1632 We have heard that there is a Panasonic version with the same part number.
The battery is available from Astro-Physics, part # E0310 for plus shipping. Note that there are some restrictions regarding shipment of Lithium batteries that could affect your order.

Repair yourself:

Send to Astro-Physics for repair: We can install the battery here at Astro-Physics for $45 and reload the database for $20, if needed, plus return shipping. Please contact Astro-Physics for a Return Authorization Number.

Real Time Clock Battery

Symptoms: You will know that your real time clock battery is dead if time does not progress. You can verify this by pressing 4 on the Main Menu screen and watching the seconds advance. According to the manufacturer, the expected life is 10 years at 25 degrees C. However, we have found that they have lasted much longer. As of October of 2016, we have replaced only three RTC chips. That's pretty remarkable considering that we have been shipping keypads since 1998!

Replacement: The battery that powers the Real Time Clock (RTC) is contained inside the RTC chip, So when that battery goes, the entire RTC chip needs to be swapped out. The Dallas Semiconductor part number is DS1994L-F5. Actual chip replacement is easy since it is held in place by a retainer bar that is soldered in place. However, the chip requires special programming and then the keypad firmware and database must be re-entered. If the process fails for some reason, then the keypad will not be functional and cannot be restored or repaired. It will have to be replaced. For this reason, we do not recommend replacing the real-time clock until it has failed. We recommend that the keypad be returned to Astro-Physics after you obtain a Return Authorization number. .

Replacement process: The keypad must be returned to Astro-Physics for repair since the the replacement chip must be programmed. We will also re-enter the keypad firmware and reload the database. Please contact Astro-Physics to obtain a Return Authorization number before sending your keypad.

Keypads 1568GTO and Higher (or keypads repaired with newer PC board)

These keypads have a different PC board and battery configuration from prior keypads. Please note that keypads with lower serial numbers could also have the new board in them if they were upgraded or repaired. If the battery does not look like the one pictured in this document, you likely have the new circuit board.

Battery for 512K Memory

The 512K memory battery includes an wire harness with a connector. This assembly is held in place by a clip. The construction was changed to secure the battery more firmly so that it will not come loose accidently causing a loss of the object installation by the customer. Battery life is estimated 5 years at room temperature, however we have found that they last much longer. If the battery fails within the 3 year keypad warranty period, it should be replaced by the manufacturer or the warrantly on the remainder of the unit could be voided. The battery itself is not covered under the warranty.

Real Time Clock for 512K Circuit Board

At this time, we do not have any information on the Real Time Clock (RTC) battery for this keypad.

We do not anticipate the batteries in these keypads will need to be replaced anytime soon. Please call Astro-Physics if you feel that your batteries need to be replaced.

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This page was last modified: October 21, 2016

Astro-Physics, Inc.
11250 Forest Hills Road, Rockford, IL  61115, U.S.A.
Phone: 815-282-1513   Fax: 815-282-9847