You need 8.35V, so you need a dc to dc booster with regulation,but charging the battery with variable current is fine. Regards! Is there any maximum charging supply voltage for charging the battery? This probably means not using a wall or car charger, but only charging from a computer’s USB port. You may want to see if you can find, possibly from the manufacturer or elsewhere, a different type of adapter. I have been at work all morning reading. It is also possible to make a simple self limiting charge circuit with a few ordinary size parts if you don’t mind a slow charge. 1/8: Nancy: The country of the charger shouldn’t make a difference so long as the outputs are correct. A fully charged battery has a lower thermal runaway temperature and will vent sooner than one that is partially charged. If this re-top-off is required frequently, then the cross-over period can become quite significant in overall efficiency (energy-in / energy-stored) of charging. It has one 18650 Lithium battery. The problem is that I can never count on ideal sunlight, so I pretty much want to pump everything the panel can generate straight into the cell. 2. I have recently bought a second battery, so now I charge one in an external charger while using the other. The unit will not turn on with these batteries. I connected to 2 battery pack 22.2V in parallel so that it becomes a 22.2V / 5000 mAh battery pack. The battery itself has a protection chip in it to prevent it from being discharged below a level it could be recharged from. This could happen in two situations:  1) it’s cloudy or night time, and the charging voltage drops below the battery voltage, and 2) battery voltage can raise and lower with environmental conditions. Does charging your battery to 80% and discharging it to 50% make it last three times longer than it would if I charged it all the way to 100% and discharge it to 10%? This seems to me unwise, but I can’t explain the chemistry. is that probably the most likely explanation? As they become saturated at that voltage, they just won’t draw any more current. BU-602: How does a Battery Fuel Gauge Work? I need six cells to rebuild two 12V battery packs, and the eBay price for six, with solder tabs, is ~$14. For a 48v lithium ion battery with 3.2v/cell, after SOC 99% to become SOC 100%, why the voltage of some cells crosses 3.8v. Or is not good to charge with less power? And I think a similar drop is true for the whole cycle. @Goutam, good questions, and I would also like to know the same if anyone knows. What is wrong? Li-ion is a “clean” system and only takes what it can absorb. The unit is not used very often and we try to maintain cells charged by “boost” charging every 1 - 3 months or so. 4, you shouldn’t float charge a lithium battery Should I now consider this cell unsafe and replace it ? Maybe I should have spent 3 times as much money for a battery from the conversion kit vendor, but then I would only have 20amphours and know very little about lithium ion science. If it is possible then which circuit is used for the load detector ??????? If i have my mobile phone plug on the charger overnight this will cause an overcharge? Can I put , what I call a trickle charge,  of 3.7DC-4.2DC without harm to the battery in a how much cathode(LiCoO2) and how much anode(graphite) we have to take to fabricate the 250 mAh cell…. And is there something I can do to make it start charging because the charger doesn’t charge when displaying a green light. but that is not possible to do all the time. There are inconsistent instructions in respective device-manuals around when they refer to MOBILE PHONES, BEARD TRIMMERS or LAWN TRIMMERS; just to mention a few devices. There used to be detailed charging information, but it has been removed, why? Thanks very much in advance. Your answer let me get a question too: If the charger stops to charge the battery and the computer will run AC for a while, why in the article is mentioned that the battery can reduce its life because to some chemical effects. But you your goals, a conceivable failure might result from a USB charger somehow shorting the 5v input straight to the intended 4.2v output, resulting in what you’re looking for. But my Canon S90 camera’s manual states that “to store the battery for long periods, deplete and remove it from camera. I think the reading at 3% was 3500mv so 3.5v. The battery is completely drained or When battery is first connected charge at c/5 (as recommended by battery manu) 2) The number of batteries needed to power 3 - servos. I have a RF remote system which is looking for signal at all time. @Bob, no, those results do not seem normal to me. Can somebody reconcile this difference? which states that Lithium Polymer can be left on charge between bike rides without detriment. This will give the charge time to saturate throughout the battery, and then when you measure the voltage, you’ll find it’s not as high as you first thought it was. The battery emf ( that means the open circuit voltage) to voltage across the 2 terminal. I have a limited power source available, so my question is, is there a down side to providing a low current during the constant current phase, like C/20 (other than longer charge time)? To Jayk: @Kevin, I’ve thought about this myself. Do you agree this is a good way to prolong battery life? (I need to knowthis so that i know we are not draining the boats power when not hooked up to the shore power). Will impact just be charging my cell phone up of 16 cells rated at 3.7 volts and 9.6v is out... 50Hz, SEC: 4.5v - 200ma my son and i will ever have the ability for the type cell... Charge cycles at the high-voltage threshold, often also at elevated temperature the battery charge! 2: slower, cooler, better 10 or more diodes to unhindered... 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