Question about SanDisk Sansa Clip MP3 Player

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Battery seems discharged and PC will not recognize

Have been happy and using Clip for a few months. Have recharged batteries a few times. Fell asleep leaving power on and in morning could not power on. Plugged into PC USB port and it did not recognize it. Tried same USB port and cable on camera and they were OK. PC is very new Vista system.

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These are the most common methods for recovering Sandisk's Sansa Mp3 Players. I have been almost universally successful in recovering Sansa players using one or a combination of these methods. These methods do not work if you are having synchronization or music format issues - they are for recovering a player that will not power up, freezes, flashes, is not recognized by the computer, and a host of other issues.

Reset the Sansa Player first. On most models, restart is done by holding the power button in for 15 seconds or longer. Check your specific manual to be sure. The manuals are available from the Sansa website if they have been misplaced.
Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/DriverDownload/driverList.asp
If these fail, then:
Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
If you get the problem where MTP Device keeps popping up continuously, uninstall the “MTP Device” by going to Start à Control Panel àSystem à Hardware à Device Manager (you computer may vary slightly, depending on Windows Version).
You may have to restart your computer after each of these methods to get them to work properly. Disconnect your Sansa player BEFORE shutting down your computer.
-Tha Mp3 Doctor

Posted on Sep 05, 2008

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Battery
& Charging

The Zen’s battery:

The Zen uses a 3.7v rated Lithium-Ion rechargeable battery. A 3.7v rated Lithium-ion battery actually gets charged to around 4.2v with a tolerance of +/- .05v. A charge of 3.7v/3.8v is actually about a 50% SoC. At 3.3v, lithium-ion batteries have typically only utilized 70% of its 100% charge capacity.

Charging Voltage = 4.2v (4.1v)
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In general, Lithium-Ion batteries do not like to be overcharged (usually above 4.2v) or excessively discharged (under 2.5v-3.0v). If a Lith-ion battery falls below 1.5v, then typically you shouldn't try to recharge it at all for "safety" concerns. A fully discharged lithium-ion battery causes the formation of copper shunt in the cell which begins to get extremely hot when attempting to recharge. A lithium-ion battery should not be charged above 4.3 volts. Above 4.3 volts and the cell causes lithium metal plating on the anode. The cathode material becomes an oxidizing agent and loses stability and begins releases oxygen. This can cause the battery to heat up. Lithium-ion cells should never get above 130°C (265°F). At 150°C (302°F) the cell becomes thermally unstable and can eventually lead to a thermal runaway. These are the safety reasons why the low and high voltage cut-off and temperature sensing circuits are used. If the internal temperature of the battery gets to high, the temperature sensing circuit can initiate a mechanical pressure switch that will permanently cut-off the current path and prevent anymore charging.

How do you charge the Zen (Battery)?

It can be charged by connecting it to a USB port on a computer or by using an AC Wall Charger within the Zen's charging specs (see below).

Can I use my cell phone's AC Charger to charge my Zen?

I believe the max input voltage of the Zen is around 5v. Most devices that can charge or run off the USB host power can handle the max 5v of USB ports. 4.2 volts is usually the max Lithium ion batteries are charged to. It is usually around when the high voltage circuit is triggered and stops the charging of the battery. I would not connect a charger to the Zen that puts out more volts then 5v with an output current beyond 2400mA (2.4A) to be safe.

When and how often to charge?

To be safe, I would avoid frequent full discharges because this puts additional strain on the battery and usually shortens its life. Partial discharges with frequent recharges are better than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no "memory effect" like with older type Ni-Cd (nickel-cadmium) batteries.

Do I need to charge the Zen for hours before I use it for the first time?

With Lith-Ion batteries, the first charge isn't any different then any other charge. There is no technical need to fully charge it the first time you get it other then the fact of being able to use it longer since it will have a full charge. They are not like other types of previously used rechargeable batteries that needed the full charge at first. Most likely by the time you get everything all figured out and loaded onto the device, the battery would be fully charged anyway.

Please note: I do recommend that you at least connect the Zen to a computer while it has sufficient charge on the battery in order to properly be detected and have its devices drivers load properly. In other words, don't use your new Zen for a period of time to where you drain enough power from the battery to just come on and turn off automatically or to the point the Zen doesn't come on at all. If you do, then you may have detection and charging issues when you go to connect the Zen to the computer.

How long will the battery in the Zen last?

Lithium-Ion batteries have a life span of about 300-500 discharge/charge cycles or 2-3 years from being manufactured.

Storing or not using the Zen for long periods of time:

Lithium-ion batteries (by themselves) with no built-in voltage monitoring circuit have a really low self-discharge rate (1-2% a month) when not being used. Having the addition of voltage monitoring circuits will slightly increase the discharge rate, but should not reach the point of excessively discharging the battery to where it won't turn back on unless sitting unused for an extended period of time and if its last state before powering off was a already in a low voltage state. So, as long as you aren't storing it for long periods of time at a low discharged voltage, the battery should be ok to recharge.

Accidently left the Zen plugged into the Computer all night or for a long period of time:

I wouldn’t make a habit of doing so. Long term usage like that could shorten the life of the battery. Although you may be fine for a while, leaving it plugged in occasionally all day and night, most likely won't hurt it, but leaving it plugged in every day and night may not be a good idea. Although once it is charged to 100%, the battery's internal high voltage cut-off circuit should keep the battery from over-charging and the devices charging circuit should keep applying a trickle charge when detected a drop in charge below full. However, keeping a Lithium-ion battery plugged in and fully charged keeps the battery's temperature elevated. Exposure to prolonged elevated temperatures can cause capacity loss which can then cause the battery to no longer be able to charge or hold a charge. Plus, it may be a small chance, but there is a chance that exposure to this condition for long periods could also increase the chance of a circuit failure (charging, high voltage, temperature sensing) and allow for a severe over-charge to take place to the point of thermal runaway which has been known to cause the occasional "exploding" battery, but in most cases just melt (and take some of the device with it) or catch fire.

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Per the USB specs:
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Before the USB bus interface can begin charging a device (Zen), it must return a device identifier to the hub driver (or device driver). Once the hub driver has the returned information from the device (like power requirements, supported transfer speeds, etc.), it can then begin charging the device based on those retuned values. This process is called Enumeration. Until enumeration has completed, it may not draw more than 100mA from the bus. Once enumeration has completed, it can then begin drawing up to the 500mA allowed by the USB bus.

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