Question about Motorola Mobility H700 Wireless Headset

7 Answers

Very poor battery life

The battery life for this device is rated at around 6 hours talk time, plus (as far as I know) it is a lithium ion battery so even if it isn't used, it should retain a charge for a long time (like a year). But mine gives me the "low battery" beeps (5 rapid beeps) continuously after only about 5 minutes of talking after a full charge. Also, I once tried using it after not using it for a few weeks and the battery was completely dead, even though I had charged it a few weeks earlier and not used it. Is my battery really crap or is it just 'not worn in' yet or something. Can you tell me if it really does have a lithium ion battery?

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  • Atulpr Dec 18, 2007

    My H700 battery seems to have conked out after 18 months of use. I have to take off the headset and speak into its mike to be heard by the caller.....which defeats the purpose of using a Bluetooth headset.Have tried contacting Motorola services who informed me to just throw it away. Atul

  • gigalojoe Dec 20, 2007

    After 14 months the battery won't hold a charge. the warranty has run out and the only alternative is to replace the headset per AT&T. Joey Soprano

    soprano2@cox.net

  • Anonymous May 23, 2008

    My Motorola H700 worked well for about a month and then the battery keeps going dead. I hate this piece of garbage and will destroy it.

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Just another made in Chine "Amero" peace of shitt

Posted on Mar 05, 2011

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Yes, it has a lithium ion battery and it has a standby time ot 200 hours. It seems like the battery is worn out and needs a replacement. Check the warranty information...if the battery is under warranty, please get it replaced. good luck

Posted on Mar 22, 2007

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I have replaced the battery with a known good battery of h700 with some other problem, now it does not pair. The purple light does not stay lit, seems to be a reset somwhere. I worked for electonic industry so I am sure I did not made any mistake installing.
Easy to open, just pry off with a sharp edge knife or small screwdirver.
My suggestion to others to install the battery conncection on top of the previous and cut off the old latter so you dont loose the programming. good luck.

Posted on May 30, 2009

A REPLACEABLE RECHARGEABLE BUTTON BATTERY WOULD BE NICE AS SOME CONSUMERS HAVE PAID CLOSE TO A HUNDRED FOR THIS DEVICE. UNIT IS NOT EASY TO OPEN, SINCE MINE WENT DEAD AFTER 2 MONTHS AND EBAY PURCHASE NOT COVERED UNDER MOTOROLA'S WARRANTY, I REALLY DIDNT HAVE ANYTHING TO LOSE. THE LITHIUM ION POLY BATTERY IS ABOUT THE SIZE OF A STICK OF DENTINE GUM AND IS HARD WIRED.
A 3V RECHARGEABLE HEARING AID BATTERY MIGHT DO THE TRICK. IT'S A SHAME BIG CORPORATIONS TALK BIG ON GOING GREEN AND DOING THIER SHARE TO HELP THE PLANET AND THEN THEY CONSCRIPT A COMMUNIST COUNTRY TO MASS PRODUCE TOXIC THROWAWAYS......'NUFF SAID.

Posted on Sep 19, 2008

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Mine is not working either the light has turned purple. what does this mean?

Posted on Jul 20, 2008

This device appears to be a piece of ****! I had mine for about 3 months when it stopped holding a charge. It would start a low battery beeping after less than 10 minutes of talk time, yet the charging indicator light would change to green (indicating a full charge) after only 10-15 minutes on the charger. It's too bad, because I was really impressed with it during the first month or so of using it...

Posted on Jul 19, 2008

MY H700 IS STUCK ON MUTE. I CAN HEAR THEM BUT THEY CAN'T HEAR ME. I HAVE TRIED TAPPING BOTH VOLUME BUTTONS BUT IT DOESN'T HELP.

Posted on May 31, 2007

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2 Answers

Zen shuts off after only playing a few songs


How long have you been doing this for (months)? You may have already drastically reduced the life of your battery

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)
Nominal Open-Circuit Voltage = 3.7v (3.6v)

A note on Over-Discharging and Over-Charging:

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.

A note regarding USB and charging:

Per the USB specs:
USB 1.1 = Minimum supply voltage is 4.4v
USB 2.0 = Minimum supply voltage is 4.75v
Both maximum supply voltages are 5.25v and a current of 500mA.

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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