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How can i fix the battery issue?

I have a 3.7V lithium battery not working properly and over heating where the charge plug is this has been an issue since day 1.

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  • The Master
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Replace it using warranty policy

Posted on Apr 25, 2017

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Posted on Jan 02, 2017

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Hi, I have a new ryobi touch start weedeater. I have used it twice. I charged it overnight for first use. It worked fine. After 2nd use ran out of charge so I re charged it . It doesn't seem


If it doesn't seem to be recharging or taking a full charge, check the charging jack to make sure no foreign object (leaf debris, etc) got into it. If it is clean, then you probably have a warranty issue with the battery or charging system.

Note: do not leave the string trimmer out in the sun or outdoors in cold weather while it is charging. The charging process only works properly at room temperature. In particular, lithium batteries are very finicky about charging conditions. Charging overheated lithium batteries can cause a fire, so they have a safety circuit to prevent charging outside the proper temperature range.

Nov 30, 2014 | Ryobi Garden

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My IPhone will not turn on. It suddenly went off, like it powered down, but wont turn back on after a 20 minute charge...even when still plugged into charger.


Try to connect it with you PC via usb cabal...and if your PC shows that he founds device (Iphone), you will see on Iphone screen that he is start charging...after that you can put it to electicity charging, with regular adapter and charge it for 1 hour and then turn it on and it will work :) That happens when battery lose her voltage (need to be 3,7V)...Otherwise if you PC, when you connect it does not show nothing, than you have some hardware failure and you need to take you Iphone to some mobile service to fix it..
Best Regards!

Sep 05, 2013 | Cell Phones

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There is an issue with the laptop charging circuit as the machine indicated plugged in, charging. However, it did not charge at all. Laptop work fine with AC Adaptor.


How old is your battery? Lithium ion based batteries normal life is 2 years starting from the date of manufacture, sometimes even less. Try using another battery and see if it will charged properly. You can also use the adapter in a compatible laptop and check if it will charge the battery.

Jan 11, 2011 | Computers & Internet

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Does it harm a Ryobi 18v lithium battery to leave on Charger?


Lithium-Ion batteries require careful charging and temperature monitoring while in the charger. Ryobi's Charging station monitors many functions and shuts off when the battery has gone through a complete charge. This is indicated by a steady Green light. Once the Charge indicator is a steady green the charger stops charging. With any battery It will slowly discharge and I don’t think the Ryobi will maintain a battery that is never removed. For example, if after a complete charge cycle if the battery was left there for 2 years and then you went to use it, it would likely be completely discharged. However if the battery charger is unplugged then plugged back in a new charge sequence would start. I lose power at my house about every 6 months or so. Once power is restored a new cycle would start and the charging cycle begins again.
Hope this helps and have a great day.

Apr 01, 2010 | Ryobi Two 18V Lithium-Ion Batteries +...

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My battery on lm70 express laptop only charges to 70%.fitted new but same problem.charged in another comp.and charged fine.


How do you know that it has charged to 70% and it is the correct percentage on your Laptop?May be you need some other program that are available on the internet that will tell you the exact charge percentage. Make note that In many ways, lithium-ion is superior to nickel and lead-based chemistries and the applications for lithium-ion batteries are growing as a result. Short battery life in a laptop is mainly cause by heat rather than charge / discharge patterns.Removing the battery from the laptop when running on fixed power protects the battery from heat. Make sure the AC Adapter that you are using [on both laptops] is supplying the correct voltage and if possible check with Load.

Jul 08, 2009 | Computers & Internet

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.

Jun 23, 2008 | Creative Labs Zen Digital Media Player

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