T60 -- battery life

[jcatmr]

I've recently acquired a T60 ( 4GBytes ) ( firmware release no. 1.02 ) and it seems that this device drains the battery fairly fast when it is [not] on. A rechargeable battery lasts less than a day.
I welcome any comments on this subject.

[caramelsoul]

Nice one....

[Ricola]

Originally Posted by jcatmr

I've recently acquired a T60 ( 4GBytes ) ( firmware release no. 1.02 ) and it seems that this device drains the battery fairly fast when it is [not] on. A rechargeable battery lasts less than a day.
I welcome any comments on this subject.

Maybe your accu is bad and not the device. I haven't seen a lot of drain with my T60 if it's not in use with NiMh-rechargeables (new kind of accu with less self discharge). It only consumes a lot of current, when it's connected to the computer. Try to select "alkaline" as battery select in the advanced settings, when using the T60 with rechargeables - it works longer that way!

[Sesquash]

Originally Posted by jcatmr

I've recently acquired a T60 ( 4GBytes ) ( firmware release no. 1.02 ) and it seems that this device drains the battery fairly fast when it is [not] on. A rechargeable battery lasts less than a day.
I welcome any comments on this subject.

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I can suggest to you the AAA rechargeable battery that I use. With one of them inside, I get around 50 hours in my Bose Quite Comfort 2's headphones.

It is the ENERGIZER 900 mAh AAA.

This is a high-end mAh capacity for AAA's. They work like a charm.

You DO NEED to use the RECHARGEABLE BATTERY DISPLAY setting for it as this allows for the 1.2 volt parameter that all rechargeables run at v.s. Alkaline that run at a full 1.5 volts. If you do not use the proper display parameter, then of course you will not be getting an accurate usage and what's left displayed on the graphics bar. You don't get a longer-lasting battery by using the Alkaline (non rechargeable usage-bar setting) when using rechargeables.

If you live in the States, I know for sure that Wal-Mart has them in their battery display near the check-outs as that is where I purchased my set of four. Keep the plastic package they come in,...they make for a good carry case. Same for the AA packaging.

[fcormier]

Duracell also makes 1000 mAh AAA batteries. Energizers were on sale so I got them.

As for Alkaline vs Rechargeable select, I have noticed also that when set to alkaline with NiMH batteries, the bar is higher. I have been using my T60 for a week, so I have yet to see what difference it makes in the long run.

As for needing the "full" 1.5 V, I am skeptical. Lots of devices have integrated voltage regulators, so if the voltage is off by 0.3 V, it will still operate correctly. It is quite common for devices to have power suppliess or batteries with more voltage than necessary and rely on voltage regulators to get the correct voltage. I have a couple of examples:
-The FM transmitter that Warehouse123.com ship with every order requires 2 AAA batteries (2x 1.5V = 3.0V or 2x 1.2V = 2.4V), but won't turn on with less than 6.0V when using an external power supply.
-The power supply of the P-Touch at work stopped working. It was a 9.5V power supply, but it could work with 6 batteries (6x 1.5V = 9.0V or 6x 1.2V = 7.2V), so I got a 9.0V power adapter and it worked flawlessly.
-Almost all MP3 players have 3.6 or 3.7 V Li-Ion batteries, yet they work an can be charged with the 5.0V supplied by the USB port.
-My portable CD player requires 2 AA batteries (2.4V or 3.0V), yet it's external power supply is 4.5V.

[Mrs_Vampire]

Originally Posted by jcatmr

I've recently acquired a T60 ( 4GBytes ) ( firmware release no. 1.02 ) and it seems that this device drains the battery fairly fast when it is [not] on. A rechargeable battery lasts less than a day.
I welcome any comments on this subject.

These Sanyo are the good one! I high recommend them!
http://www.amazon.com/Sanyo-Eneloop-...2840246&sr=1-1

[fcormier]

From what I've seen today and yesterday, the power display is not accurate when set at rechargeable. I have a rechargeable battery in it, it stayed at 3 bars for an hour or less, not very long at 2 and has been oscillating between 0 and 1 (mostly 0) for a couple of hours and I'm even able to transfer files at 0 bar. With an alkaline battery (set at alkaline), when it was oscillating between 1 and 2, I couldn't transfer files. My theory is that alkaline and rechargeable are reversed or rechargeable is just wrongly calibrated for NiMH batteries.

[Sesquash]

Originally Posted by fcormier

From what I've seen today and yesterday, the power display is not accurate when set at rechargeable. I have a rechargeable battery in it, it stayed at 3 bars for an hour or less, not very long at 2 and has been oscillating between 0 and 1 (mostly 0) for a couple of hours and I'm even able to transfer files at 0 bar. With an alkaline battery (set at alkaline), when it was oscillating between 1 and 2, I couldn't transfer files. My theory is that alkaline and rechargeable are reversed or rechargeable is just wrongly calibrated for NiMH batteries.

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On my T10, The bars go down evenly as they did with the Alkaline setting. You are not supposed to let your NiMH go to a dead charge as it is not healthy for them. So, when my bars disappear, I then swap out and slap another 2650'er in.

[webtax]

Originally Posted by fcormier

From what I've seen today and yesterday, the power display is not accurate when set at rechargeable. I have a rechargeable battery in it, it stayed at 3 bars for an hour or less, not very long at 2 and has been oscillating between 0 and 1 (mostly 0) for a couple of hours and I'm even able to transfer files at 0 bar.

the same happened to me!

[JonP01]

Originally Posted by fcormier

My theory is that alkaline and rechargeable are reversed or rechargeable is just wrongly calibrated for NiMH batteries.

We both have the same theory. Infact I mentioned this to iriver a few months back. Never heard anything back from them though.

[SeptimusBG]

Originally Posted by fcormier

My theory is that alkaline and rechargeable are reversed or rechargeable is just wrongly calibrated for NiMH batteries.

I think the same thing..

Maybe we should use "alkaline mode" when using rechargeables..

[magoood]

Originally Posted by Sesquash

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You DO NEED to use the RECHARGEABLE BATTERY DISPLAY setting for it as this allows for the 1.2 volt parameter.

Hi - I wanna know where's that setting ? i did not find it in my T60 player - can u plz clarify more ? thanks

[fcormier]

I tested my rechargeable battery in alkaline mode yesterday, and the last time I looked at it, it had 2 bars and died less than an hour later.

[SeptimusBG]

OK people,

what is conclusion about this issue..?

[SeptimusBG]

OK people,

what is conclusion about this issue..?

[fcormier]

My conclusion is that I put in a battery, listen to music, when the battery dies, I replace it and listen to more music!

Seriously, I don't really care about the indicator, I always have a spare charged battery on hand.

[SeptimusBG]

But what type of indicator:

Alkaline or Recharg. ?? (with Recharg. batteries)

[ShyAnne]

Originally Posted by SeptimusBG

But what type of indicator:

Alkaline or Recharg. ?? (with Recharg. batteries)

As per earlier in the the thread, it's possible the battery read indicator is switched on the T60, meaning that "alkaline" actually is the setting to accurately read rechargeable NiMHs, and "rechargeable" is the setting that accurately reads alkalines.

Regardless of which setting is used, the battery you use is still going to last the same amount of time. Neither setting is going to make any battery last longer. It's just a matter of getting an accurate reading of remaining capacity. So choose whatever setting you like.

But I believe what fcormier is trying to say in the last post is "what does it matter?"
It's not like you gotta go find a USB port if you happen to be away and your battery runs out. You can always carry a spare charged NiMH, or if you forget then AAA alkalines can easily be found anywhere.

[sherelec]

I have had a T60 for about a week and was curious about the battery indicator because of some forum comments that I read before purchase. I have designed a few battery powered instruments so I have some battery knowledge and a Volt meter.

The Alkaline Duracell shipped with the unit was used until the player turned off (died) and measured 1.06V when removed from the player.

The 4 NiMH batteries I have used since have died at 1.03 to 1.07V, 2 run as Alkaline and 2 run as Rechargables. All started at about 1.45V.

Conclusion: the player shutoff is using a fixed Voltage Shutoff of approximately 1.05V, independent of the battery setting.

I have not tried to figure out which setting is more accurate for the NiMH batteries. But, from past experience designing equipment for both Alkalines and NiMH batteries, I note the following:

For Alkalines, a simple plot of output voltage versus time, at a constant current, will show a new battery at approximately 1.65V with a rather quick decay down to 1.55V then a linear decaying voltage to an end of life voltage (1.1 to 0.7V) depending on load. At the end there is often a short period of rapidly falling output, more pronounced at high load current.

The NiMH plotted the same as above will start out at 1.4 to 1.5V with very little initial decay. The voltage will look much more constant, over time, than the Alkaline. The end of life will be at a very fast rate, dropping several tenths of a volt over a few minutes. NiMH batteries do not like to be discharged much below 1.0V, as recharge cycles are much reduced.

The relatively flat voltage discharge for NiMH makes a voltage monitor state of charge indicator very difficult to implement. The Alkaline rather linear decay makes a voltage monitor an easy choice for a state of charge indicator. I am assuming that the T60 is using a voltage monitor to derive its state of charge display.

A good test would be to record the battery voltage where the bars change for both battery settings. However, I don't think that I am bored or patient enough to do that test!

[Endunkror]

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