xm8 battery

[Amazing KG3]

some Xm8's cant have a rail, because they have a weird hatch thing. Some handsome devil in New Brunswick has one...

[swatt13]

well since were talking about handsome devils; i know a handsome devil in brooks, who owns an m8 and has a rail on the hand guard. i do have a g36 long rail on the bottom of my hand guard, so grims option a viable, i was hoping to keep everything inside the gun. but its not like im not willing to step outside my boundries.

[Amazing KG3]

is the surefire battery thingy actually sable, because then that would be awesome.

[Egon Spengler]

It is possible to put two batteries together in parallel, but if their capacities are different, one will tend to charge the other, resulting in net loss of power.

You could use some diodes to ensure that current only flows out of the battery packs, and then parallel them *after* the diodes. I did this in a ham radio config (I'm VY2CRV, btw) - I have an old Icom IC751, which has its RAM backed up by a lithium cell. Problem is, if you disconnect the existing cell, the RAM goes dead, and the radio is useless until you build a programmer for the thing. Not fun.

Solution? Well, looking at the module with the battery, it became obvious that they were using a diode setup to prevent the lithium battery from receiving charge from the operating circuit when the radio was one (which would kill the lithium cell, if not cause it to overheat.)

Solution? My good friend VY2OX (Lowell) designed a small board with two battery clips on it, each isolated by diodes. Now, when the batteries go dicky (in 20 years, mind you!) I can pop them out one at a time and replace them without the radio going poof.

If the radio lives that long . . .

So . . . you could do the same, with higher current diodes, and then remove the packs for charging, since the diodes would block the charging.

Just an idea.

[swatt13]

you lost me a "diodes"

[Swatt Six-Four]

diodes are a solid state component that will only let electron current flow go one way(ie: power only flows out not in, like a check valve) primary example is a wheatstone bridge design used for basic conversion of ac to dc. that being said the one thing your forgeting is that dc power in parrelle is additive and that while you are correct that there would be a slight" charging effect" on the smaller battery the cumlative mah is therfore greater and that "charging" effect is actually the combined battery pack way of achiving ballance. I will however agree that diodes are a fantastic way of isolatiog each battery pack from each other and limiting the negative effects should a cell go wrong on one of the packs. I however feel they are too impractical and also feel that the less juction points you have between the power supply and the motor the better.

[swatt13]

thanks captian obvious, you cover that basic mechanics and science class :zzz: :salute: . i was implying that, that would be making something more complicated than it has to be (as you summized in the end of your post swattmedic), if that was really simpler and a better way to go, im sure the JAPANESE companies who design these guns would have implimented it. no offence egon, its just funny to see people new to the scene are always trying to prove their worth by worrying/trying to change things that work just fine, but you grow outta that and start worrying about the practicallity rather the functionality **cough, blair, cough**