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LiPo battery question

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Old 09-17-2017, 11:27 AM
  #1
jsfait
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Default LiPo battery question

Hello,

For Christmas last year, my son got a FeiLun FT012 RC Speedboat, which came with one 1800mAh 3S LiPo battery. We had no experience with LiPo batteries. After researching them, we decided to get him an extra battery so he could enjoy running it for more than 6 or 10 minutes before having to charge. We purchased a Gens ace 1800mAh 11.1V 25C 3S for $20. Now looking to purchase a few more, and I see that Gens ace 2200mAh 11.1V 25C 3S are only $15. Why would 2200mAh be cheaper than 1800? More importantly, would there be any reason not to purchase the 2200mAh vs. additional 1800mAh?

Thanks in advance for any helpful replies!

Jeff
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Old 09-17-2017, 11:40 AM
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If the difference is between last Christmas and now, it might illustrate was happens when exchange rates fluctuate. Looking today at one supplier, the 2200 does cost more than the 1800 from that one supplier. Others have different prices for both.
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Old 09-17-2017, 12:02 PM
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jsfait
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Thanks, but the question regarding cost difference was just curiosity. Gens ace is still selling the 1800 for about $20, so that has not changed. I don't know what they were selling 2200 for last year, but they are currently selling them for about $15. I assume it's simply supply/demand, 2200 being a more popular battery? Anyway, the more important question is whether or not we can run a 2200mAh battery in his boat. The rest of the numbers are the same (11.1V 25C 3S), but the boat came with an 1800mAh battery. Does that mean 1800 is the only thing we can/should use for it? If we could use 2200, what are the advantages/disadvantages vs. 1800?
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Old 09-17-2017, 07:36 PM
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The capacity of the battery is expressed in milliamperes. A 2200 ma battery has more capacity than an 1800 battery. If size or weight are not considerations, the 2200 ma battery will give longer run time before recharging. I hope this helps.
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Old 09-17-2017, 10:44 PM
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About the price, the 2200mAh is on discount, so the price is lower. And they two with different plugs.
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Old 09-18-2017, 12:23 AM
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Quote:
Originally Posted by cardinalflyer View Post
The capacity of the battery is expressed in milliamperes. A 2200 ma battery has more capacity than an 1800 battery. If size or weight are not considerations, the 2200 ma battery will give longer run time before recharging. I hope this helps.
Battery capacity is expressed in milli-Ampere-Hours, and gives a clue as to how long you can draw a given current. The "Hours" bit is important. The C rating tells you the maximum current that the battery can output safely.
The 2200mAH battery of the same C rating should power a given load for longer, the question then becomes one of whether the motor and/or controller will stand the extra run time on a given day.
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Old 09-18-2017, 05:41 AM
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Quote:
Originally Posted by mushia View Post
About the price, the 2200mAh is on discount, so the price is lower. And they two with different plugs.
Different plugs could be a significant issue.
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Old 09-18-2017, 06:55 AM
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We already have one of the 1800mAh by this brand, and both their 1800 and 2200 are advertised as "Dean's Plug" so I'm thinking plug would not be an issue. I'm concluding we could safely try the battery with higher mAh rating but same C rating as long as size and weight of the larger battery are not prohibitive. Thank you all very much for your helpful responses!
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Old 09-18-2017, 11:26 PM
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OK. Sorry for not checking it clearly. Then you could try the 2200mAh one.

Quote:
Originally Posted by jsfait View Post
We already have one of the 1800mAh by this brand, and both their 1800 and 2200 are advertised as "Dean's Plug" so I'm thinking plug would not be an issue. I'm concluding we could safely try the battery with higher mAh rating but same C rating as long as size and weight of the larger battery are not prohibitive. Thank you all very much for your helpful responses!
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Old 09-19-2017, 03:34 AM
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No need to apologize. I very much appreciate this well-organized forum. What a tremendous resource! Thanks again to those who take the time to respond to beginners' questions. Maybe someday I will be knowledgeable enough to help others in this way...
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Old 09-25-2017, 04:13 PM
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As long as physical size and weight are not a limiting factor then you could use any 3 cell Lipo of any listed capacity. Of course a smaller capacity would be counter productive in your case. You are also not limited by the "C" rating. In fact a battery with a higher C rating will provide a bit more performance over one with a lower C rating.

The most important point in your case is that your application requires a 3 cell pack and is designed to work well with the voltage a 3 cell pack provides. A 4 cell pack MIGHT work but could cause premature failure of your speed control if it can't handle the extra voltage. Best to just stick with 3 cell packs.
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