[time-nuts] Battery for ESE 911 GPS Receiver/Clock

[Gregory Beat]

For a DIY Solution, the battery cells need to be Rechargable.  Battery chemistry and charging voltage/current present is a different discussion/decision.

4 battery cells would be wired in SERIES.
Voltage = 4 times voltage of single cell (1.5V) = 4 x 1.5 V = 6 Volts
Current = current (mA/hour or A/hour) of single cell.
https://learn.adafruit.com/all-about-batteries/power-capacity-and-power-capability

BATTERY UNIVERSITY
Serial and Parallel Battery Configurations  
https://batteryuniversity.com/learn/article/serial_and_parallel_battery_configurations

Since Rechargable Batteries have LESS mAh capacity than Alkaline or other throw-away batteries, Four (4) “AA” cells in series could be disappointing, while four (4)” C” cells in series would offer better capacity.

gb
Sent from iPad Air

> On Apr 28, 2020, at 12:26 PM, Gregory Beat <w9gb at icloud.com> wrote:
> 
> Yes, I received that notice yesterday (Panasonic LC-R061R3P)
> https://www.digikey.com/product-detail/en/panasonic-bsg/LC-R061R3P/P128-ND/6671
> 
> Panasonic is discontinuing many of their “LC” rechargable (sealed lead-acid) batteries.  Panasonic battery orders are accepted by Digi-Key until September 30.
> —
> Digi-Key has a recommended substitution from BB Battery (6V 1.3Ah), BP1-2-6-T1.
> https://www.digikey.com/product-detail/en/b-b-battery/BP1-2-6-T1/522-1000-ND/653321
> —
> ESE used this 6 V SLA battery in many of its master clock designs.
> This battery form factor is used in a number of electronic appliances, so other battery manufacturers are available.
> 
> A DIY alternative would use a 4-cell Cylindrical Battery Holder, such as those available from Keystone Electronics in New Hyde Park, NY (or Eastern Asia mfg.).
> The 6 Volt, 1.3Ah specification could be met with “C” cells wired in series.
> https://www.keyelco.com/category.cfm/Battery-Coin-Cell-Holders-Contacts-Clips/Cylindrical-Cell-Holders/p/404/id/1213
> 
> greg
> ==
> From: Frederick Bray
> Sent: Tuesday, April 28, 2020 11:00 AM
> To: time-nuts at lists.febo.com
> Subject: [time-nuts] Battery for ESE 911 GPS Receiver/Clock
> 
> For those of us with an ESE 911 GPS receiver / master clock, Digi-Key has announced the end of availability / end of life for the
> internal SLA backup battery.
>