Question about Sanyo RL-4930 Cellular Phone

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Suspect Battery is Dead But Not Completely Certain


My wife has a Sanyo RL-4930 Sprint Cell Phone (battery is the Sanyo SCP-16LBPS) and we'd appreciate troubleshooting help on whether or not her battery is going bad or if her phone is just acting strange.


1. Phone will not hold a battery charge any more.
2. Past few weeks phone could only hold a limited charge (between a few minutes and maybe an hour) before it would need recharged.
3. When the phone charger is plugged into the phone, we can succesfully power on the phone but only for what seems to be under a minute before the phone powers itself off.
4. The cell phone has been operating fine for the past 18 months. It has not been dropped or dunked or anything out of the usual recently. We have used the same charger and battery for the life of the phone.


Y/N - Shouldn't having the phone's wall outlet batter charger plugged into the phone over-ride the phone's power requirements for a battery and allow us to use strictly "wall outlet power" to allow us to use our phone for as long as we like?

Y/N Is there a way we can isolate whether or not the battery is defective or just the phone is defective. If Yes, please provide us details!


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In my 30+ years of servicing battery operated devices, I have to tell you that 95% of the time, it's a bad battery.

Question1 : I agree that it should operate on outlet power. Perhaps the battery has a shorted cell and is eating up all of the charger's available current. Chargers have a limited amount of capacity.

Question2: Charge the battery then remove it from the phone. It should be slightly warm to the touch if you touch it within a few minutes of completion. If you have access to a DC Voltmeter, let the battery sit for a couple hours and check the voltage. It should be at least (usually higher) what is written on it. Other than that, replacing it is the only other way.

Hope that helps...


Posted on Apr 04, 2008


Geno69 - You pegged the problem! 

I got a replacement battery, plugged the wall outlet charger in, 
and the phone worked flawlessly; I talked 20 minutes while the new battery was charging and the phone never cut out.

Replacing the old battery with a new battery did the trick which is leaving me to presume that one can't rely on the wall charger alone in order to get power to this cell phone.

Also I learned I won't buy batteries from
ever again.  They have good prices, but they lied to me twice,
and outright lost my shipment; finally I spent most of day 
doing their job trying to track it down.  The time I spent wasn't
worth the few bucks I saved and the horrible experience I

Second thing I learned (and I broke this rule a little) is when
putting new batteries in cell phone, it's best to completely
charge, use until completely drained, and repeat 3x to 
"condition" the batteries.  At least this is what I thought I
read in the packaging!


Posted on Apr 05, 2008


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