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>> Home > Tags > lipo charge

lipo charge
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lipo charge
46" Firefloat What Motor/Battery by jarvo Fleet Admiral!   Posted: 22 days ago
HI JJ. Your question about a safety bag, Damaged / overcharged lipo's can catch fire, think of the Boeing scandal that grounded the fleet last year. Charging in a safety bag is advised the bag is fire retardant material, which will contain any problem. Your remarks about the boat not coming onto the plane is down to the weight of the battery, my fireboat started with 7.2v NimH packs 1 for each motor, Graupner 700bb's, good cruise but not quick, but short run time, 10mins. I have re-wired to allow 3s lipo's, but not had chance to test it yet, but should go like stink. With a fast hull, weight is important, 4 x lipo packs, 1kg, half the weight and possibly 6 times the power delivery. In your first post you mention 600 motors on 6volts, they are probably rated at 8.4volts, same as my 700's hence the lack of performance, also the battery, at 12ah it should last about 30mins, was it fully charged??? and is it showing at least 6volts, ie not got a duff cell??? Canabus, in his post described an ideal set up with brushless motors, 1600 watts is just over 2 hp, 750 per horsepower so you can see the difference in performance with different motors and battery set up's

46" Firefloat What Motor/Battery by canabus Admiral   Posted: 23 days ago
Hi What type of props are you using(size and number of blades). I see your basic problem is under powered motors and a very heavy battery. I made the big switch over three years ago from brush to brushless motors and to Lipo batteries. With the help on the forum and club members it was a learning curve, but, I would not go back. A 5800mah Lipo battery is in the weight of 450 to 570 grams and would give you a good 1/2 hour run time. A good balance charger and safety bag are the main requirements, also maximum charging for the 5800mah battery is 5.8 Amps(same as the old Nicads). Also a low voltage battery alarm. Your 600 motors can draw up to12Amps !!! Replacement same size motors for your mounts would be 35mm brushless motors, but, you will require two ESCs with a Y connector to run on the same throttle channel. Replacement brushless motors are far more powerful e.g. a Hobbyking 3639-1100kv with a 60Amp ESC on a 4S 5800mah Lipo Battery is 800watts and with two in your boat is 1600 watts!!! Your old motor would in the 100 watt each mark !! I have the same size crash tender, but, with a single brushless motor. I have all the order numbers for the motors etc. and a setup the ESCs if your require. Canabus

Voltage step down by Haverlock Fleet Admiral!   Posted: 25 days ago
What your asking for is possible but not easy. A 12V ESC will handle an overvoltage but I cannot say how much and depending upon the current draw of your motor a voltage regulator can be expensive. The simple solution is to get a 3s LIPO However you do need a special charger and have to make sure you do not discharge a LIPO to too lower voltage. https://www.rchelicopterfun.com/rc-lipo-batteries.html if your interested in going LIPO have a read about the care and feeding of them.

PROBOAT RECOIL 17 12.1 VOLT BATTERY by Dave M Fleet Admiral!   Posted: 1 month ago
Hi Les Yes I agree there is no way with the charger supplied you can do anything other than charge to full capacity. I do believe we have made suggestions on another thread on the site advising possible solutions. The cheapest would be to just buy a simple battery checker and make sure after you use the battery the voltage is around the 3.7-3.8v mark. Run a bit more to reduce and short charge to increase. If you are intending to become serious about modelling and using LiPos then, like most of us you will want to buy a charger that does the job for you automatically. There is a cost but if you protect your batteries they will last and save you money in the long term. I've not had much hair for some years so probably that's why!

PROBOAT RECOIL 17 12.1 VOLT BATTERY by Dave M Fleet Admiral!   Posted: 1 month ago
Hi Les If you are happy with this connector and your other equipment uses this type I would leave well alone. If you do decide to change then I agree XT60 or Deans are common. Does mean you will need to change all the connectors on your equipment or get converters. Not sure I agree with keeping Lipos at above storage charge for any length of time. I have had several of mine balloon before I knew better and I was using them every week. I suspect high temperature may be a factor but that's just my opinion. I now make sure any batteries I have charged are used even for a short time just to drop them from full charge. I use the air boat on the bench. I do agree you should use a storage charge if you are unsure when you may use them again.

PROBOAT RECOIL 17 12.1 VOLT BATTERY by Dave M Fleet Admiral!   Posted: 1 month ago
Hi Les It means what it says. Good to see a clearly marked battery for once. You can discharge at up to 20 times the capacity 1300x20= 26000Ma or 26amps It claims you can charge at 3 time capacity 3.9amps. Personally I never charge my Lipos at more than the rated capacity 1.3amps in your case. The battery capacity is 1300Mah has 3 cells (3S) and a nominal voltage of 11.1v (3.7v per cell) Each Lipo should be treated in accordance with its specs. A 2200mah battery may well have a different discharge rate. The dearer batteries usually have higher discharge capabilities. Charging should be done individually and again in accordance with its specs. Not sure why you are asking the final question but if you are thinking of using two batteries together they should have identical specs. Personally I would advise against this as you run the risk of damaging a battery if all the cells are not balanced, not to mention the risks involved both personal and material.

Twin motor control problem by John Fleet Admiral!   Posted: 1 month ago
I will take some pictures when I go on Wednesday. The connections are all good. The problem is present either when the boat is first put into the water or shortly within seconds after. The battery is a 3cell Lipo always fully charged before use. I have used a bec and without a bec. Esc's are Mtroniks tio marine 30. I have tried several tx and rx it is currently a Planet!

DISCHARGE CONUNDRUM by Haverlock Fleet Admiral!   Posted: 1 month ago
I agree if your serious about preserving your LIPO get a balance charger they are not expensive and will allow you to charge/discharge to a storage voltage https://www.ebay.co.uk/itm/New-iMAX-B6-AC-Lipo-NiMH-Polymer-...

lipo storage charge by RNinMunich Fleet Admiral!   Posted: 1 month ago
All's well that ends well👍 Happy boat hunting, cheers Doug 😎

lipo storage charge by octman Captain   Posted: 1 month ago
Thanks for the input. Sorry to have started a bit off a heated discussion. My charger was behaving somewhat differently to what I expected, having already watched many You Tube videos, But at the end of the day all is well now, mainly due the fact that my original power supply was a bit too wimpy and has been replaced by one with the required output. My batteries have now been storage charged and ready for action and a full charge at a future date. All I need now is a boat to put them in. Chris

lipo storage charge by RNinMunich Fleet Admiral!   Posted: 2 months ago
Hi Dave, all well and good, but you told Chris that there is something wrong with his unit. Which there isn't he was simply in Storage Charge mode (as his thread title and query stated) and the unit reacted correctly for that mode. Battery tech is progressing almost as fast as processors so I guess we can expect frequent updates and differences. 🤔 Have a nice day, the rain has reached us at last after a week or two of Indian Summer. Cheers Doug 😎 Hope Chris doesn't get confused by info overload from the vid! I simply checked the operating manual of the unit Chris is using.

lipo storage charge by Dave M Fleet Admiral!   Posted: 2 months ago
As I explained I was talking about charging at the end of my first post. For a novice I do believe video explanations are far easier to follow which is why I made my initial suggestion. I did not look at your first suggestion as it required me to download a pdf file from a source I do not know. The other two sites both suggest it is safe to discharge down to 2.5v per cell - may have been when written but modern cells should be kept above 3v and I try to keep mine nearer 3.5 v. I also see they recommend charging at 2C from storage! If you buy a 3 cell LiPo mine are delivered with an 11.1v storage charge which equates to 3.7v per cell. I did once watch a very long and detailed video made by a developer and manufacturer of LiPo batteries and learn't that at 3.7v the cell was in its most stable state (chemically wise) consistent with long life and storage. If the battery has any charge I do believe the amount of damage will be the same, but perhaps more spectacular if fully charged. Most modern chargers from reputable suppliers will provide a safe charging and storage charge. Providing your charger is setting the right voltages no harm should occur. As they say a video says a thousand words and the one I suggested covered the Imax B6 very comprehensibly.

lipo storage charge by RNinMunich Fleet Admiral!   Posted: 2 months ago
Hi Dave, I'm sorry too cos I didn't say you recommended anything! But you did state that 'something is wrong', which it clearly wasn't operating the unit in Storage Charge mode. Also 3.7V is only the nominal cell voltage. The recommended Storage voltage is 3.85V, as stated in the charger manual, and which is what the charger did. The objective is to limit the amount of stored energy which can cause havoc if anything unforeseen happens in storage, as well as to prolong the life of the battery. See also attached LiPo storage tips. http://uterc.org/files/LipoStorageTips.pdf http://www.bigrcmodels.com/RC-Helicopter-LiPo-Battery-Storag... https://www.propwashed.com/lipo-storage-voltage/ Just three samples of several which all state the storage voltage (SV) as 3.8 or 3.85V. The safety leaflets which came with my LiPos also said the same. Cheers Doug 😎

lipo storage charge by Dave M Fleet Admiral!   Posted: 2 months ago
Sorry Doug I did not recommend anything of the sort and clearly stated storage charge was 7.4v for two cells. I did then give further details about charging but suggested a U-tube video that explained in detail how to use the charger.

lipo storage charge by RNinMunich Fleet Admiral!   Posted: 2 months ago
Hi Chris, DON'T PANIC! There's nothing wrong with your charger / controller 😊 3.7V is the 'nominal' voltage per LiPo cell. The 'Storage' voltage used by your charger is quoted in the manual as 3.85V per cell. See pic. Therefore, give or take 50mV or so your charger is operating quite correctly in Storage Charge mode. Before starting the device indicates the nominal voltage of the battery you have specified, i.e. 2S which is why it shows 7.4V before starting the charge. At the end of the cycle the battery voltage should be around 7.6 - 7.7V which it apparently was. 👍 The controller will discharge a battery with a higher starting voltage than 7.6V and charge one with a lower starting voltage. Dave was talking of Full Charge voltages, which is not recommended for storing LiPos!! Cheers Doug 😎