Use a shorter 2S and 3S stacked combination. Put the groups end to end. You can buy 700 mAh LiPo individual batteries that are 43mm long, 30mm wide, and 5.5mm thick. That would result in a 5S pack that is 17.5mm thick, 86mm long, and 30mm wide. Add some thickness for wrapping and it gets a tiny bit larger in all dimensions but fits into an emag battery pack.
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Since these won't be powering an esc for an rc vehicle do the packs need to have the same C rating?
Just asking just in case some one is like hey I have those.
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Also a pack with more than one cell will need to be balanced when charging,
I for one have the cells to produce the right size pack but have no idea how to wire a balancing plug.
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Can I combine 2 3.7 volt 450mah lipo batteries to make 900mah batteries without them blowing Up? I know lipo is different than nimh batteries.
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Yes if you are connecting them in parallel the end result would be a 3.7v 900mah battery. If you hooked them in series then you would have a 7.4v 450mah battery.
What are the internal dimensions of the emag battery housing? Or how big is the existing emag battery?
What is the operating voltage of the emag board both high and is there a cut off where it will stop working? A fully charged 5s lipo will be 21v can the board handle that? You also don't want to over discharge a lipo so if the board won't stop at about 16-16.5v then you could be bringing the lipo cells to low.The user formally known as Lancecst.Comment
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All batteries work basically the same. You need to make sure you use the same batteries so that the current output is balanced across the parallel combination. That way they will equally share the load. When you actually put both batteries in parallel, they have to be at the same voltage potential to prevent the higher voltage battery from instantly trying to top up the lower voltage battery. In lower capacity cells its not so much of an issue, but in high capacity cells, the inrush current can be significant and can cause a lot of heat.
You can combine quite a few parallel cells for increased capacity.
Load balancing for series combination is often just a wired plug. The charger can then monitor the charge of the individual cells and trickle charge those individual cells in the pack to top them all up following the initial high current charge.
BLachance75: The emag board operates on 5v which is regulated down from the battery voltage. It doesn't care about the battery fluctuation from full charge to empty. The high voltage is used to power the solenoid only. It also doesn't care if the voltage fluctuates a bit as long as there is enough charge to power the solenoid. I wouldn't go overboard with high voltage, because it will result in more heat generation, but a volt or two for that purpose won't adversely affect the operation or life. The 16.8V NiMh pack operated from 14V to 19.6V. A 5S LiPo pack operates from 15V to 21V.Except for the Automag in front, its usually the man behind the equipment that counts.Comment
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I would think the 500mA pack would work quite well. I was searching around for batteries recently and found some small ones that were around 700mA. They would fit into the emag battery pack quite nicely with room to move. They would have been quite a bit less mass than the existing pack.Except for the Automag in front, its usually the man behind the equipment that counts.Comment
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we now need to find a source for a very small voltage cut off board or something to put in the pack so we don't let the cells drop to low and destroy them from charging properly then.
wish p8ntball4me was around. he could talk on this a little more to help me with my knowledge of getting a board that can do what Im talking about it doing for a small package footprint.
because if i can get these ill put them together and get them to the public.
with a package and such put together these would be a neat option to have.
how many amps do we need?
do we need a fuse like the NiMh packs have? or do you think this feature would be in the voltage cut off board?Comment
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That makes sense that the board runs on 5v and the high voltage is for the solenoid.
It would be very helpful to have a low voltage cut off board so that people aren't over discharging the lipos. Personally I don't like taking a lipo below 3.2v so I'd set the cutoff at 16v. If it is something that is being produced for sale I may even have it set higher for liability, possibly 16.5v or 17v.
Running a 5s battery I would recommend that there is a balance plug. An issue that you may run into is that people will have to buy new chargers if they don't have one that will balance charge lipos.The user formally known as Lancecst.Comment
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yes on all this. exactly.
I found a board to manage the cutoff voltage, but its to big for my liking, it will fit in the current battery pack.
but then we have to tackle the pack size then.
if I can find something size wise to get this made for the public.
I would offer the batteries and the option to purchase a charger and a charging bag with it.
just shopping this stuff is time consuming. chargers and battery bags are easy.Comment
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There are a few small footprint pcb cutoff circuits kicking around. I've seen them, but couldn't point you to them off the top of my head. I'll keep an eye out for them and mark them if I happen to see them again. Those are critical to maintaining your batteries. Some individual batteries might actially have them built in. You can build one with a simple comparitor and a reference voltage, or get nice and fancy and use a small microprocessor. Texas Instruments actually makes a small battery protection IC. You can use their example design to build a protection device.Except for the Automag in front, its usually the man behind the equipment that counts.Comment
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