This pretty much matches my experience with these batteries, though I
haven't been as scientific in timing it. One of these days I'm going to
have to measure the self-discharge rate, both connected to the radio and
separate. I just leave a couple of the radios clipped into the door
pockets on my Pathfinder, with spare batteries in zip-lock bags, and
they've always worked when I've needed them. It's a HUGE improvement
over the NiMH and NiCd packs that have been standard for so long. My
TH-D7 won't run for any length of time on either of the overpriced
batteries I've got for it, and it's got to be fresh off the charger if
you want to use it at all.
Scott
Keith VE7GDH wrote:
>
>
> Gervais VE2CKN wrote...
>
> > my battery of my new does not stay charge at all for a long time, I
> > have been lucky if it stay 3/4 day on...
>
> 09:00... I turned a PX-777 on with a fully-charged stock 1200 mAh
> battery attached. I have the backlight on all of the time and the radio
> is scanning. The frequencies I'm scanning aren't too busy, but there is
> some activity. I've used the radio quite a bit since I got it, sometimes
> in some lengthy QSOs and I've never ran it down. Let's see how long it
> lasts today with it on scan. I don't have the programming cable yet
> (it's on the way) so don't know if "battery save" is enabled, but with
> the radio scanning, it shouldn't make any difference.
>
> 15:00... Six hours and still going. The battery gauge is still showing
> "full" and the radio has seen a few minutes of transmit time. The rest
> of the time it has been scanning continuously.
>
> 16:00... I intended my "run down" test to be mostly scanning, but I just
> had a 20 minute QSO with it. The radio was on low power and I was
> probably transmitting as much as I was receiving during he QSO. That's
> seven hours so far.
>
> 18:45... Radio now showing just two bars on the battery indicator.
> Transmitted (low power) for 30 seconds and still showing two bars. put
> it back on scan. The PX-777 has been on for only 9 hrs 45 mins, but with
> a fair bit of transmit time. I haven't tried measuring what the radio
> draws, but assuming it's in the 100 mA range, it should go for about 12
> hours with no transmit time.
>
> 21:00... That's 12 hours, and still going strong with two bars on the
> battery indicator.
>
> 21:45... I then had a 20-25 minute QSO on low power starting at 21:00.
> When we cleared, it was just dropping down to one bar. I think I would
> have to say that was exceptional performance. Nearly 12 1/2 hours on
> scan with the backlight on and about 45+ mins of QSO, and it's still
> scanning.
>
> 21:54... no bars showing and still scanning. I took the battery off for
> a moment and measured 6.79 volts. If I assume a critical voltage of 3 V
> per cell, it should still be OK. I assume the radio will turn off at
> some set voltage. Back on scan after. I then remembered the charging
> terminals on the back... 6.58 V at 22:04 and still capable of
> transmitting.
>
> 22:05... the radio (still on scan) is beeping every few seconds. I
> assume this is a low voltage alarm. Yup, the battery gauge is now
> flashing, at least when it's not scanning, and I measured 6.41 V on the
> back of the battery. The radio will no longer transmit.
>
> 22:13... radio turned itself off and I measured. 0 V on the battery
> whether I use the charge connectors or the ones on the other side. I
> hope there's some protection circuitry in the battery rather than the
> battery actually being zero volts! Discharging much below 3V per cell
> can kill Li-ion batteries! Message to self... if I ever get a low
> battery warning again, turn it off!
>
> Gervais... I take it you are getting less time out of your battery? I
> got 13 hours and 13 minutes out of it, continuously on scan with the
> backlight on and about 45+ mins of QSO (low power) as well.
> If I'm still awake, I'll be able to see how long it took to charge.
>
> 73 es cul - Keith VE7GDH
> --
> "I may be lost, but I know exactly where I am!"
>
>
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