Hi all,
I was here (
MP5 Battery issues, clock-calendar function) about 2 years ago regarding my MP5 player and some things I needed to figure out (Originally I wasn't sure if the chip was a 2705 or 2706. After taking another look, I'm fairly certain it's a 2705). I've got some of it squared away and then got distracted before I could spend any more time on the battery issue. So, I'm back to tap into the wonderful collective wisdom that exists in this forum
Still not getting the amount of play time I would expect (from what I hear others are getting), and it may be getting worse given the aging of the battery. I finally took some measurements of current draw under operating conditions (display on/off, music/no music). Here's what I found:
1. Display off, no music - 39mA
2. Display off, music playing - 82mA
3. Display on, no music - 115mA
4. Display on, music playing - 148mA
My Conclusions:
A. The display draws quite a bit when on. Even so, given the supposed A-H capacity of the battery (see below), I should still be getting 3 hours and a bit more of play time, (520/150 ~ 3.5). With the display off (or short on-time, where it's set now), I should be getting closer to 6 hours. Not the 10-15 some people have told me, but certainly better than what I have been getting (1-2 hours).
B. Playing music adds about 40mA of loading.
One other thing I noticed is that when I do a soft turn on, while the button is pressed, I get a fairly high current draw (~130mA). When I let go, the draw goes back to normal?
So, do these readings sound normal to folks?
I may very well need to replace the battery. I do not know if it's NiCad or Li-Ion (makes a difference in charging methods). Physically, the battery is 2" x 1-1/8" x ~1/8" thick. On 1 side, there are 2 printed lines. The first is "XXSUYUEN" or "XXOUYUEN" (where the "XX" are letters I can't read) followed by 043048SP (part no.?). Below this is "7V 520mAh 09A". The "520mAh", IMO, would mean 520 milliamp-hours in tech-speak. The "7V", I'm not so sure of. Taking a direct voltage measurement on the battery, I get a nominal 4.0 VDC, give or take depending on whether the unit is on or not and/or has the charger plugged in. BTW - The charger that came with this unit is 5.5VDC @ 500mA output, so I doubt the "7V" on the battery means 7 VDC.
And any ideas where to find a replacement? I'm thinking about going to an external battery-based supply (using more standard rechargeable LiIons), but that kind of impacts the whole portability concept.
Anyway, appreciate any help or insight anyone has.
Thanks and cheers...Steph