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May 16th, 2009, 20:11
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#1 |
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what is the charging time for a umarex mp7
Hi i just bought a mp7 made by umarex and i am wondering wath is the charging time because in the manual it said 4 hours but i saw elsewhere that it was 2 hours instead. Thank you for your anwser cause i dont want to fried up my battery (by the way it a 7.2v 450ma).
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May 16th, 2009, 21:30
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#2 | |
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What's the output of the charger?
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May 16th, 2009, 21:39
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#3 |
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Yeah, you must know the output of your charger first, and then the mAh of your battery, which you stated as 450.
So you take your charger output (in mA / milliamps), and divide your battery mAh rating by this output current. So if you have 450 mAh battery, and a 200 mA charger, then you only need 450/200 hours or 2:15. But 2.5H would be a safe charging time. So once you know the output current of your charger, then just do this and you know your charge time!
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I love freedom and consequently America |
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May 16th, 2009, 22:03
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#4 | |
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Actually, you have to multiply that final result by 1.2 to be accurate. Ni-Mah batteries only hold about 80% of the power put into them.
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May 17th, 2009, 12:45
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#5 |
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Thank you all for such a quick answer. Good thing i ask cause i already charge the battery 2 time for 4 hours(like id said in the manual). So i have a 250mA and my battery is a 450mA
so if i make the division it make 1.8 x 1.2 = 2.16 or 2h10min, it a huge difference from 4h, it will spare some good battery life. |
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