RC-Monster Forums - View Single Post - Li-Ion Power Tool cells work great for RC!

BrianG · 05.04.2006, 02:10 PM

I think I'm going to wait for the DeWalt 36v system using the A123 systems cells to come out and see how they work, how much they weight, and what the cell dimensions are. Seeing as how it is 36v and 3Ah, I assume it will be made up of 10 x 3Ah cells? Assuming so, I would want to wire it up in a 5s2p configuration for 18v @ 6Ah. Due to where my batteries are going to go, it would be easier to wire up two 5s1p sets in parallel. Is this "safe" or would it be better to wire two cells in parallel, and then place five of these sets in series (so basically I have the equivalent of five sets of 6Ah cells in series)?

What I'm afraid of is if I have two sets of 5s1p in parallel, I won't be able to balance each set unless they are charged individually. And then if they are charged individually, the total voltage on each pack might be slightly different enough for one set to charge the other when they are wired in parallel to each other.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	05.04.2006, 02:10 PM I think I'm going to wait for the DeWalt 36v system using the A123 systems cells to come out and see how they work, how much they weight, and what the cell dimensions are. Seeing as how it is 36v and 3Ah, I assume it will be made up of 10 x 3Ah cells? Assuming so, I would want to wire it up in a 5s2p configuration for 18v @ 6Ah. Due to where my batteries are going to go, it would be easier to wire up two 5s1p sets in parallel. Is this "safe" or would it be better to wire two cells in parallel, and then place five of these sets in series (so basically I have the equivalent of five sets of 6Ah cells in series)? What I'm afraid of is if I have two sets of 5s1p in parallel, I won't be able to balance each set unless they are charged individually. And then if they are charged individually, the total voltage on each pack might be slightly different enough for one set to charge the other when they are wired in parallel to each other.