Post your Battery weight - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-27-2009, 07:20 PM   #21
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Re: Post your Battery weight

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Originally Posted by Ken Currell View Post
Took a moment to weigh an A123 2300 ma cell.

73.6 grams (2.6 oz) with 1/2 length tabs attached
Ken clearly states cell.

Originally Posted by michael v
And if you are making a 2300mA battery from Dewalt again you are using 2 cells.
So, what you are saying is; you don't know about any a123 systems cells other than the ones in front of you.

a123 systems make a wide range of cell sizes, only the chemistry and voltage are constant across the product range. DeWalt uses both 1100 and 2300 mAh cells in their products. Black and Decker VPX (now discontinued) only used 1100 mAh cells.

Ken's cells came from a DeWalt 36 Volt pack (10s 1p 2300 mAh a123 cells). I have a DeWalt 18 Volt Lithium pack for my tools, different again at 6s 2p 1100 mAh a123 cells. Dewalt is rather liberal on the pack voltage definition.

a123 also makes larger cells for hybrid cars and racing motorcycles.
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Old 01-27-2009, 07:37 PM   #22
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Re: Post your Battery weight

Here is a pic of a disassembled dewalt 36 volt pack Ten 2300 ma cells ken was giving the weight of a single cell
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Old 01-27-2009, 10:41 PM   #23
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Re: Post your Battery weight

OK guys. Sorry I haven't kept up to al the posts.

I double checked with my friend about his aircraft.

The plane is scratch built.
The wing is a copy of the Great Planes Extra 300
The fuselage is similar in shape but the construction is different.

On the bench with 6s 5000 ma LiPo pack it draws 50 amps. (48 amps with 7s 4600 ma A123 cells)
In flight with LiPos it draws around 30 amps at full throttle. (checked with watts up meter in flight). NOTE: Due to the size of the A123 pack there wasn't enough room for the Watts up meter.
Total aircraft flying weight with Lipos 61/4 pounds
Total aircraft flying weight with A123 7s 2p pack is a couple of ounces under 7 pounds.

He also corrected me about the flight time. It was 12 minutes (not 12.5) at wide open throttle after allowing for the take off and landing. The flight was at full throttle to test the battery under full load for his aircraft which would give him the minimum time of a flight.

After the flight the batteries still had some power left in them.

Yes these batteries do weigh more but the flight performance is quite good in medium to large size aircraft that can handle a bit of extra weight and have enough room for the extra size of the battery pack.

The plane could probably have a reasonably good flight on a 7s 1p A123 2300 ma pack under normal flying conditions.
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