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Tek TDS3000 series, LI-PO battery conversion?
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Tracker:
Hi Folks,
Has anyone managed to make a LI-PO pack using 18650 batteries and a balanced charger board?

I figure it can't be too hard since the original tds3batc pack is 12v...

The TDS3000 series has 5 pins in the battery compartment, but without a schematic diagram its hard to know what they all do... any ideas?

Thanks
 
rvalente:
A quick google search brings the battery module already is lithium (not sure if lipo or liion).

Tracker:
yes saw that, but I want to make my own with 18650 and a balanced charger board.

I just don't know the pinput and function,

This is what I can measure...
pin 1  Gnd
pin 2  Gnd
pin 3 +3v with a 1 second pulse
pin 5 +14.4v
pin 5 +14.8v

For some reason i can't find a schematic, the 'service manual' has blank pages labeled Diagrams???
 
Tracker:
So an update and a question....
I think I found a pinout over on another thread: https://www.eevblog.com/forum/testgear/battery-voltage-and-for-tektronix-tds-3000-series-oscilloscope/

<locating key>
MINUS
NC
DATA (used to query the battery status)
PLUS-TO-CHARGER
BAT-PLUS

I was thinking to just ignore the 'data' and hook up a 12.6v Li-PO balanced charger circuit...
PLUS-TO-CHARGER would be the charging input to the balance board
BAT-PLUS would be the Balance board output.

Using this balanced board... https://www.ebay.co.uk/itm/174692848077?hash=item28ac8151cd:g:vWsAAOSwH-BfvgR9

see anything wrong with this idea?
Apart from  no current limit on the lipo output...
 
Extrasolar:
Hi Tracker,

What data protocol might be used here ?? 
Because I am only getting a "Wake Up" query from the scope, but the Module is not responding back !!
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