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more electronics than electrics - battery and charging question

psychicwarrior
this pic --> https://drive.google.com/file/d/1gunP4gFyIucj0ITstccf2D2szu3cw17O/view


is of parts of a radio that has a compartment for a rechargeable battery. 


From the pic and the pin voltages I measured (measurements not accurate I'm sure), is it possible to 'suggest' how the battery was wired/connected to the pins ?


It is a Genus Type-R DAB radio from yesteryear and the manufacturer no longer exists and getting hold of tech diagrams or info from other sources has proved fruitless.  The base plate states 7.2V battery pack.


Some companies have suggested they can put together a battery unit for me to fit, but they need to know how the leads need to be connected from the battery to the internal charging connector (4 pins)  and I cannot get from anywhere a manual, or a picture etc.


If it is possible to work out from the above picture etc, please let me know though I doubt without the manufacturer info it is likely possible (from what I've been told so far).  Additionally, I tried contacting one person who I found selling the radio, but they too had no battery to send a pic of.


Regards

Habs
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    Digging a bit it seems that these radios were sold without batteries mostly even when new, so  the odds are really slim now.

    A possibility may be to track down a service manual -  a schematic of the charger circuit would reveal more All cells rise  in voltage as they charge, and when the plates are fully coated any excess goes into splitting the water .  NiMH cells are ok for a slow constant current charge once 'full' , as the nickel catalyses any Oxygen and Hydrogen produced back to water, at least it can do this at a rates less than the 10 hour rate of charge (so <= 50mA for a 500mAh cell for many hours is OK)  Li Ion have no gas dispersal mechanism short of explosion, so need to have the rising voltage monitored and cut off hard at 4V or so, and the electronics will reflect this, also it is usual to bring a centre contact out to make sure one cell is not over voltage.

    However, it is also common in all types of battery pack to include a thermistor to act as a warning of impending doom and throttle back the charge current.


    However, if we cannot be sure, I'd say it is far safer to ignore the built in charger, and see if any of These standard battery holders for AA or AAA cells  can be fitted in the battery bay, such that 7V or so ends up across  pins 1 and 4 in the same polarity you are measuring with the mains supply, I;d probably tack solder  some thin red and black ( call me old fashioned) to the back of the connector, and try with the mains power removed, supplying battery power in at those points.


    If that work, then you could do worse than  buy tagged cells AA tagged    or   tagged AAA        and with a bit of fast soldering and some tape you can roll your own battery packs to whatever funny shape you need.
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  • 0
    Digging a bit it seems that these radios were sold without batteries mostly even when new, so  the odds are really slim now.

    A possibility may be to track down a service manual -  a schematic of the charger circuit would reveal more All cells rise  in voltage as they charge, and when the plates are fully coated any excess goes into splitting the water .  NiMH cells are ok for a slow constant current charge once 'full' , as the nickel catalyses any Oxygen and Hydrogen produced back to water, at least it can do this at a rates less than the 10 hour rate of charge (so <= 50mA for a 500mAh cell for many hours is OK)  Li Ion have no gas dispersal mechanism short of explosion, so need to have the rising voltage monitored and cut off hard at 4V or so, and the electronics will reflect this, also it is usual to bring a centre contact out to make sure one cell is not over voltage.

    However, it is also common in all types of battery pack to include a thermistor to act as a warning of impending doom and throttle back the charge current.


    However, if we cannot be sure, I'd say it is far safer to ignore the built in charger, and see if any of These standard battery holders for AA or AAA cells  can be fitted in the battery bay, such that 7V or so ends up across  pins 1 and 4 in the same polarity you are measuring with the mains supply, I;d probably tack solder  some thin red and black ( call me old fashioned) to the back of the connector, and try with the mains power removed, supplying battery power in at those points.


    If that work, then you could do worse than  buy tagged cells AA tagged    or   tagged AAA        and with a bit of fast soldering and some tape you can roll your own battery packs to whatever funny shape you need.
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