[Yaesu] Yaesu LiON battery question

[pegasus at mho.net]

Humm..
    6.8 volts on an HT battery during high-power transmit sounds about
normal to me.  I would check with some other people who can measure
voltage under load before you start tearing the battery apart or
replacing it.
Dennis


> On Thu, Dec 06, 2007 at 09:45:15AM -0800, John Geiger wrote:
>> What should the voltage drop to on a fully charged
>> 7.4v LiON battery (used on the VX5R, VX6R, VX7R) when
>> transmitting on high power?  I have a FNB-80 on my
>> VX5R that shows 8.3 volts when fully charged, but when
>> I transmit on high power it quickly drops to 6.8
>> volts. Is this normal, or is the battery about dead
>> and needing to be replaced?
>>
>> In addition, I charged it overnight last night using
>> the wall charger and it said still charging when I
>> woke up this morning.  That is unusual as they seem in
>> the past to always fully charge overnight.  The drop
>> in charger will fully charge it to where the green LED
>> comes on.
>>
>> And people were telling me on the repeater that my
>> audio would cut in and out.  The carrier whould stay,
>> but the audio would drop out.  Would this also happen
>> with an almost depleted battery?  Never really had
>> those kinds of reports before on a Yaesu HT.
>
> Sounds like a classic case of high internal resistance in the battery
> pack, John. If that's the case, the solution may be to take it to a
> battery shop to have the individual cells checked. If only one is bad,
> it could be worthwhile to have it replaced. If multiple cells are bad,
> the battery store may still be able to give you a better price for a
> complete re-cell than a ham store would want for a new pack.
>
> My local battery store has re-celled a couple of VX-150 packs for me
> at some savings over the AES/Universal price for a new pack.
>
> --
> Mike Andrews, W5EGO
> mikea at mikea.ath.cx
> Tired old sysadmin
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