[Premium-Rx] WJ 8618 and 8617 Replacement Batteries

[WJ]

I used three AAA NiMH in a standard holder.  I mounted them in the uP bay 
near the rear panel using one of the screws already in the bay.  This 
arrangement held the memory in one radio while it was in storage for 9 months.

I won't trust NiCDs.  I had to replace a corroded ribbon cable and restore 
the circuit board under the memory batteries. I never want to do that 
again.  What a mess.

Terry O'
http://watkins-johnson.terryo.org





At 07:37 AM 8/15/2006, you wrote:

>I tried a large capacitor and it would not hold for a day.
>
>I ended up wiring in a twin AA holder and Velcro'd it to a nearby bulkhead,
>used regular NICAD AA's, worked great and easy to swap if they go bad.
>Tom N5OFF
>
>
>
>--- stephous <stephous at att.net> wrote:
>
> > Interesting idea. Sure, you can use almost anything that will store 
> energy as
> > long as it has characteristics similar to the original device.
> >
> > 1) Form: Radial leaded Ni-Cad 3.6V battery, 90 mAh, -20 to +85C operating
> > 2) Fit: Physically compatible with original battery holder, similar length
> > 3) Function: Low self discharge rate, no shelf life, low charge rate, same
> > impedance
> >
> > The other radios I own will all get new batteries. Some have cordless phone
> > batteries jammed in. One has RC car batteries. One has a non rechargeable
> > lithium cell, very wrong.
> >
> > Note: The Cadnicas are epoxy sealed so they probably won't leak unless they
> > explode. The original battery has a soft seal. The charging circuit 
> does not
> > provide enough current to explode the battery <20 mA (100 mW).
> >
> > PCS Associates
> > 949 Glenneyre Street
> > Laguna Beach, CA. 92651-2706
> > Phone: (949) 376-7844
> > FAX: (949) 376-7866
> > http://www.pcsassociates.net/
> >   ----- Original Message -----
> >   From: Ahmet G.
> >   To: stephous ; premium-rx at ml.skirrow.org
> >   Sent: Monday, August 14, 2006 3:42 PM
> >   Subject: Re: [Premium-Rx] WJ 8618 and 8617 Replacement Batteries
> >
> >
> >   Why not use a 1F supercap type capacitor. No leakage problems and works
> > just like a battery. i used them in 8718 and RF590s and they work fine.
> > chose right voltage rating.  doesn't have to be exactly the same 
> voltage, can
> > use 5V Cap for most applications.
> >   regards, ahmet
> >
> >
> >
> >
> >     A suitable replacement for worn out CMOS back up batteries, WJ 8617 /
> > 8618, all versions, BT1, p/n 180090-1:
> >
> >     Replacement Part:
> >     Sanyo Cadnica N-SB3
> >     3.6V
> >     90 mAh
> >     -20C to +80C
> >     D = 15.5 mm
> >     L = 55.5 mm
> >
> >     *Installation requires:
> >     1) Sleeve exterior with heat shrink tubing, WOER E203950 3/4", 125C
> >     2) Bend leads 90 degrees, trim, and solder wires in place
> >     3) Use original sleeves to cover soldered wire ends
> >
> >     Source:
> >     http://www.batterystore.com/Sanyo/NSB3.htm
> >
> >     Regards,
> >     Steve Pappin
> >
> >     PCS Associates
> >     949 Glenneyre Street
> >     Laguna Beach, CA. 92651-2706
> >     Phone: (949) 376-7844
> >     FAX: (949) 376-7866
> >     http://www.pcsassociates.net/
> >
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