[MRCA] MRCA Digest, Vol 102, Issue 9

[Walter Treftz]

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Sent: Wednesday, October 17, 2012 12:02 PM
Subject: MRCA Digest, Vol 102, Issue 9
 
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Today's Topics:

   1. bb-390 battery - strangeness (W2HX)


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Message: 1
Date: Tue, 16 Oct 2012 17:02:23 -0700
From: "W2HX" <w2hx at w2hx.com>
Subject: [MRCA] bb-390 battery - strangeness
To: "'armyradios at yahoogroups.com'" <armyradios at yahoogroups.com>,
    "mrca at mailman.qth.net" <mrca at mailman.qth.net>
Message-ID:
    <A84117545CAA524BA8C609247D3650571DAC3AE0D5 at EX-BE-012-SV1.shared.themessagecenter.com>
    
Content-Type: text/plain; charset=us-ascii

Here's a strange one. I have a bren-tronics bb-390b/u battery (NiMH). It has two SOC (state of charge) 5-segment displays, one display for each 12V section.  The battery seems to function totally normally with respect to capacity, charging and discharging (using my bren-tronics soldier portable charger and discharger). But what is strange is that one of the two SOC displays will show 5 bars when fully charged but will still show 4 bars when totally discharged! I even ran that side of the battery down to 0.5V manually with a high power resistor still 4 segments showed. The other SOC display works 100% FB.

What I don't get is, what is keeping these segments "lit up"? I have discharged both sides of the battery to 0.5V and the SOC still shows 4 segments.  Where is it getting the power to illuminate the segments? Any ideas? I guess I should try running it down to 0V and see what happens. BTW: These 390 batteries seem to indicate 0% charge (0 segments lit) when the battery is discharged to 11V from 12V.  So just 1V separates empty from full.

Any ideas?
Eugene




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End of MRCA Digest, Vol 102, Issue 9
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