[time-nuts] Li Ion Battery for HP 5065A

[ew]

For my frequency stand alone setup opposite the rest of the lab I have a 100 A 12V AGM/Inverter/Resonsnt Transformer that will power the setup for 10 hours, but like you I like remove the HP 5065A powered up. Did consider a similar system for the HP 5061B but have not and most likely will not touch it.I am concerned about fire but I have more than 10 in one form or the other Li Ion batteries in the house. The Battery is inside the frame that comes with the unit. Starting with a quality product, slow charging and dual max voltage control and dual low voltage shut out risk is very low. Changing the Zener in the 65 reduces the output from 33V to 29.5V. The 65 cut out of 21.5V is perfect for 7 batteries. Charging will be close to C/20.  Most problems out there seem to be do to over charge and temperature rise. Multiple tests will be done with the pack outside the unit to allow close monitoring.The main reason for my posting is the pile of junk batteries and finding a reliable source.in the US.
Bert Kehren
In a message dated 3/7/2019 8:24:09 PM Eastern Standard Time, jltran at att.net writes:

Bert,

I'm interested in your quest.

I'm interested in batteries for not only the 5065A but also the 5061A and B.  I was thinking of an SLA for the 5061's.  I like the idea of being able to move the units without having to also move a separate battery backup system simultaneously.

What have you come up with and how have you addressed the potential for catastrophic failure of a Lithium Ion battery?

Hope all is well.

Joe

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of ew via time-nuts
Sent: Thursday, March 07, 2019 3:37 PM
To: time-nuts at lists.febo.com
Cc: ew
Subject: [time-nuts] Li Ion Battery for HP 5065A



Having recently acquired a HP 5065A with clock I decided to put a battery in it. My choice is 5000 mA Lithium Ion. Having in the past very good experience with a Florida vendor, was first choice. Sadly he is going out of business. 90+% out there is junk, have 26650s with 1800 mA. Last week finally located a reliable vendor, purchased seven 21700 Samsung B50s, reasonable price. 21700 is a better fit in the 50 X 65 X175 mm battery frame. After extensive dialog with vapah.inc and bench tests of all seven 4800 to 5200 mA, I am convinced that I found in the US a very viable source. No commercial or any other interest, now my only problem is how to get rid of the other junk.


Bert Kehren
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