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17.03.2014
Hi folks, lately I have stumbled upon a question in Yahoo answers regarding the topic above – rc car battery is getting too hot. It is okay to NiMH battery to get worm and even a little bit hot but, to a degree that it yet can be held on hand. Conclusion – If you are saving the money and going brushless with your motor and esc, try saving a little bit more money and go Lipo with your rc car battery. Charging and discharging batteries is a chemical reaction, but Li-ion is claimed to be the exception. The Li ion charger is a voltage-limiting device that has similarities to the lead acid system. Figure 1 shows the voltage and current signature as lithium-ion passes through the stages for constant current and topping charge. Full charge occurs when the battery reaches the voltage threshold and the current drops to 3 percent of the rated current. Li-ion does not need to be fully charged as is the case with lead acid, nor is it desirable to do so. Certain industrial chargers set the charge voltage threshold lower on purpose to prolong battery life. Estimating SoC by reading the voltage of a charging battery is impractical; measuring the open circuit voltage (OCV) after the battery has rested for a few hours is a better indicator. When lithium-ion batteries must be left in the charger for operational readiness, some chargers apply a brief topping charge to compensate for the small self-discharge the battery and its protective circuit consume.
Chargers for these non-cobalt-based Li-ions are not compatible with regular 3.60-volt Li-ion. Lithium-ion operates safely within the designated operating voltages; however, the battery becomes unstable if inadvertently charged to a higher than specified voltage. Turn off the device or disconnect the load on charge to allow the current to drop unhindered during saturation. Very usefull information here, good thing I fond this page first before designing a charger for my custom-made battery pack. The Batery is connected circuit 3,6 volt constant (regulable according to load) and this support a circuit for memory and a processor primary.
Can lithium polymer cell phone batteries be over charged if left on charge to long and if left on to long will it diminish battery life.
I would also like to brag of having had success restoring substantial capacity to the occasional cells that truly were worn.
What i have believed is keeping my laptop plugged in all the time at my desk and using the battery power in case of power failure or so. A vendor of notebooks recently opposed and recommended to cycle discharges and recharges regularly to keep the battery healthy and prolong its life. What i have believed is keeping my laptop plugged in all the time at my desk and using the battery power in case of power failure or so does no harm to my battery pack.
These batteries have been run down for some time now and do charge, the manufacturer cannot replace them.
How can the voltage be 2.4v when the minimum cell voltage for lithium batteries is 3.6v What should I buy to replace these? AFAIK Li-ion does not have memory effect and they have PMS circuit built-in so don’t overcharge. I have a simple ARM7 gadget and I want to run it on the Li-ion batteries which are available cheap. Informative article but the voltage drop in stage 3 would indicate a cell in poor condition. About 5 years ago I purchased 40 nearly unused 18X65 cells in 2 cell packs with protect circuit. Why can the the battery pack in a Tesla automobile be charged considerably faster when the charging unit is 240v vs. Not all Li cells are the same so the numbers I use below are for the most common ones, some can be charged much faster. I am unable to decide which is better - to select a Li-ion battery pack with multiple cells or single cell. We have limited information by how much lower charge voltages prolong battery life; this depends on many conditions, as we have learned.


I would connect the solar panel and the battery with a voltage regulator or with a MPP circuit that fixed the output voltage adjusting the output current of the solar panel catching always the maximum power from it. In conclusion the charging of the battery is done with a small and variable charge current. One question: Would charging a Lithium battery with a higher amperage charger (but same voltage) cause any damage to the battery?
Battery scientists talk about energies flowing in and out of the battery as part of ion movement between anode and cathode.
The differences with Li-ion lie in a higher voltage per cell, tighter voltage tolerances and the absence of trickle or float charge at full charge.
Full charge is reached when the current decreases to between 3 and 5 percent of the Ah rating. A battery is also considered fully charged if the current levels off and cannot go down further. Although the battery reaches the voltage peak quicker, the saturation charge will take longer accordingly. Table 2 illustrates the estimated capacities when charged to different voltage thresholds with and without saturation charge. The current drawn through the device is called the parasitic load and can distort the charge cycle.
This allows the battery to reach the set voltage threshold and current saturation point unhindered. A fully charged battery has a lower thermal runaway temperature and will vent sooner than one that is partially charged. Lead- and nickel-based batteries are also known to melt down and cause fire if improperly handled.
The charge circuit is straight forward; voltage and current limitations are easier to accommodate than analyzing complex voltage signatures, which change as the battery ages. Battery University monitors the comments and understands the importance of expressing perspectives and opinions in a shared forum.
You’re alwais talking about a 4,2V like they are the the standardwhat about 3,6V cells?
I looked on the internet for the issue and located most individuals will associate with together with your website. For instance I’ve been letting it hover around 40% by continually plugging and unplugging it. I think a constant voltage charge can be done but it takes a long time and must be done at a lower voltage. It was designed that way to account for commonly available power connections, commonly limited to 20A (use at < 80% of limit) at 120v but commonly available at 50 A or more at 240V. I know that my available curent and voltage at the time of charging will vary depending on the panel so in addition to overcharging I am wondering if capacitors to buffer power is necessary.
This claim carries merits but if the scientists were totally right, then the battery would live forever.
While lead acid offers some flexibility in terms of voltage cut off, manufacturers of Li-ion cells are very strict on the correct setting because Li-ion cannot accept overcharge.
With higher current, Stage 1 is shorter but the saturation during Stage 2 will take longer.
Choosing a lower voltage threshold or eliminating the saturation charge altogether, prolongs battery life but this reduces the runtime. State-of-charge (SoC) at this point is about 85 percent, a level that may be sufficient for many users. Battery manufacturers advise against parasitic loads while charging because they induce mini-cycles. A parasitic load confuses the charger by depressing the battery voltage and preventing the current in the saturation stage to drop low enough by drawing a leakage current.
The cathode material becomes an oxidizing agent, loses stability and produces carbon dioxide (CO2). All lithium-based batteries are safer at a lower charge, and this is why authorities will mandate air shipment of Li-ion at 30 percent state-of-charge rather than at full charge.
Properly designed charging equipment is paramount for all battery systems and temperature sensing is a reliable watchman.


The charge process can be intermittent, and Li-ion does not need saturation as is the case with lead acid. However, all communication must be done with the use of appropriate language and the avoidance of spam and discrimination. We recommend posting your question in the comment sections for the Battery University Group (BUG) to share.
Since the charger uses a standard micro USB tip, there are a lot of available chargers out there with different Amp rating.
But upon plugging the charger to the batteries the green light immediatley came on, indicating a fully charged pack. When the above charging is done and the battery sits 12 hours, measuring the voltage and setting the float voltage to that is safe and gives maximum capacity but that voltage goes down as the battery ages. I have also considered a 3000mAh battery with an integrated charging circuit would be better.
They blame capacity fade on ions getting trapped, but as with all battery systems, internal corrosion and other degenerative effects still play a role. The so-called miracle charger that promises to prolong battery life and gain extra capacity with pulses and other gimmicks does not exist.
Boosting the voltage increases capacity, but going beyond specification stresses the battery and compromises safety. Chargers for consumer products go for maximum capacity and cannot be adjusted; extended service life is perceived less important.
Note that a Li-ion battery that has received a fully saturated charge will keep the voltage elevated for a longer than one that has not received a saturation charge. A battery may be fully charged, but the prevailing conditions will prompt a continued charge, causing stress. This offers a major advantage for renewable energy storage such as a solar panel and wind turbine, which cannot always fully charge the battery. Is it advisable to get a low Amp rating such as 500mah, higher amp such as 1200mah or stick with the same 1000amp? I commonly pull cells that are totally flat: 0v, sometimes even with polarity reversed by a few millivolts. A float voltage of 4.1 is reasonable to get best capacity but as the battery gets old, that MIGHT make it age faster.
That would offer me more consistent ouput to the device and be a contingency for a lack of or poor lighting. Should the pressure rise further, the safety membrane on some Li-ion bursts open at about 3,450kPa (500psi) and the cell might eventually vent with flame.
If your concern is about a battery(a standard battery rating will be in volts and mAh), go for either one but in reduction in back up, in case if you chose 500mAh.Hope it cleared your doubt.
In addition, some of the battery packs I ripped into were prehistoric by lithium chemistry standards (10 years+).
Letting them set 24 hrs, I looked at the voltage drop and classified the lowest 10% as weak.
I think charging with variable current is satisfactory if current is limited as specified on the data sheet and the voltage is limited to 4.1 volts.
Besides selecting the best-suited voltage thresholds, it is also important that the battery does not stay in the high-voltage stage for a long time and is allowed to drop after full charge has been reached.
I now believe its because I always left the phone on while charging whereas he turns his off.
The stress level on the battery is high because the cycles occur at the high-voltage threshold, often also at elevated temperature. More often than not all cells would recharge to their FULL original rated capacity and perform as new. So my question is; Why is the charger displaying a Green LED when in fact the batteries need charged. And is there something I can do to make it start charging because the charger doesn’t charge when displaying a green light.



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