Theoretically, you COULD do a Lithium Ion powerpack, but it would be expensive. Lithium Ion cells are 3.6 volts apiece. If you do the math, 5 of them together is exactly 18 volts. It'd be a very lightweight battery pack, but the extra savings really wouldn't be worth it.
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Lithium has a high C rating but the chargers are very expensive. Lithium cells are very particular in their charging and require a very accurate charger. You would need a charger specifically for your battery or you would have to charge each cell independently.Except for the Automag in front, its usually the man behind the equipment that counts.Comment
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I would love to see this go somewhere. The only gripe I have with the E-mag is the gargantuan battery brick
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Most places that make battery packs sell a charger to go with the pack. I've seen AA Li-Ion for $5.00 each, and chargers for packs up to 14.3 volts around $35.00.Originally posted by athomasComment
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I have been plaining on switching to Lithium cells, but I can't find a ready made pack on the internet with the required circuitry so i am going to make my own.
Great site cheap cells, they have a nice 9v lithium cell for other markers.
In order to do this you need 5 lithium cells, protection circuitry in the pack, and a charger that balances the pack. But if you want do this your self I should warn you most lithium cells can catch fire, if not discharged and charged properly. It is very important that the over discharger/overcharge is built into the pack, if a lithium cell is over charged or over discharged the electrolytes within the pack heat up and turn to gas. That gas cause pressure to build within the pack and it vents causing a cocktail of flamible gases to release and posibly egnite.
Anyway if you have questions just ask I will be watching the post.
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Well - I'm thinking right now I'm going to stick to the regular 16.8 volt pack made of AAA's. I've been quoted $50 shipped for a brand new one with 1000mAh (compared to 650 stock). Now I'm just checking out a few other places to see if they have 1200MAh packs available. Will keep everybody updated on the results.Comment
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you really dont need anything more then 650mAh at that capacity you get 20k shots, why do you need more? why not do two standard 9v's NiMH at 350mAh and call it a day, it will be really cheap and it should last around 10k shots.Comment
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I thought the C rating on 2 NiHm 9volts is too low.
As for why 1000 mAh vs 650 - well the price difference is negligable and I plan on running my warp and revvy off the battery.Comment
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I'd go for the 1000mah battery pack over the 650 as well, just because it gives you more buffer in the event that your battery isn't fully charged, especially since there really isn't much price difference.
The 2 x 9v batteries won't work well at all due to the low C rating.Except for the Automag in front, its usually the man behind the equipment that counts.Comment
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What kind of current does the solenoid require?Comment
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Based on 30ms of dwell and a life expectancy of 20000 shots using the 650ma battery pack I calculated a 3.9A current draw. I believe the actual value is less than that, although it is still very high.
The 9v batteries have such a low C rating combined with a lower capacity, that they just can't do the job.
Eg; A 650ma AAA cell with a C rating of 1 can deliver 650ma of current. A 9v (325ma) battery with a lower C rating of .5 can only deliver 162.5ma of current.
AAA batteries can often deliver high C values. 9v batteries often deliver fractional values of C.Except for the Automag in front, its usually the man behind the equipment that counts.Comment
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Most of the NiMH 9v cells I have been seeing can do a 2C constant discharge and a pulse discharge upwards of 3C.
Dont forget on thing the peak current for the solenoid comes from the parellel capacitor on the board, the battery just recharges the capacitor before each pulse. I do not know if AGD put a series resistor to the capacitor to reduce the charge current/time but if they did then the peak currents for the capcitor would be less then the peak currents required for the solenoid. But then again they most likely wouldn't use a series resistor to the capacitor b/c you want that capacitor to charge back up quickly and stabalize before the next pulse.
I would suggest to measure the current comming out of the battery and see how much you really need.
But your way will work too......
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Here is a 9 volt I was looking to purchase. http://www.thomasdistributing.com/ip...le-battery.phpComment
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Use two of those and you are set.Originally posted by Ryan373
Just be carfull when it comes to batteries you get what you pay for, cheap no name batteries are just that.....cheap. Not to say these are crap b/c i really have not idea about these particular ones but generaly speaking.
I bought three 9.6v NiMH battery from some online place and when I got then two where compleatly dead and unusable.Last edited by Chrishew09; 05-31-2007, 04:55 PM.Comment
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