Battery question

[Nyraised1]

Hi new member, thanks for the add. Question I have a Hubsan h501ss and I'm looking at getting new batteries, mine are old and starting to swell. The IEM batteries are 7.4v 2700mah and 10c. I found a battery that will fit, (hoping for upgrade) can I run a 7.4v 5000mah and 30c. Can I use this or will it fry my quad? I really don't understand the c rating, it how the man affects it. Thanks

 

[wafflejock]

That'll work fine should be better than stock if the C rating is legit. C rating is just a max discharge or charge rating on a cell and is used with capacity to calculate the actual max amps discharge you multiply the C rating by capacity in Ah to get max amps charge or discharge, typically charge rate is 1C which effectively means 1hr to charge the cell. With your 2.7Ah battery at 10C it can potentially discharge 27A safely without damage to the cell (Loss of cycles or recharges), it doesn't mean the battery will automatically put out more power but if there is more to draw so if you put a bigger load (bigger motor or other stuff that draws more watts) then the higher C battery could deal with that easier and will dip less in voltage when under some given load. It is a trade off though typically higher C batteries will have slightly lower capacity, higher capacity cells can have lower max discharge rate, but ultimately it depends on the exact chemistry going on in the cells and how quickly the lithium ions can flow to "compensate" or match up with the electron flow you're asking of the battery.

 

[wafflejock]

Basically if you draw more current from a battery than it is tested/designed to deal with the cells will overheat from internal resistance in the cells themselves and the increased heat increases resistance so is a runaway effect and end up burning power as heat in the battery more than desired and quicker than the cells can bleed off the heat and things can get catastrophic if you have a battery with too low a discharge capability and try to draw too much power from it. What you are doing with increasing C rating of battery is just increasing the supply current but not changing anything about the load or how much is actually pulled from the battery.

 

[Nyraised1]

Thanks for the quick replies guys. Here is a few of the batteries I'm looking at. Is there any pros or cons to using these instead if the standard 7.4v 2700mah 10c battery? These are 5200mAh 80C 7.4V EC3 LiPo Battery 2S

 

[wafflejock]

Nah typically with something close to double capacity they will be double the weight roughly so you could get more flight time but will have more inertia/momentum to overcome with the extra weight and the motors won't be getting significantly more power in any moment to compensate so in general not worth doing IMO better off with more smaller batteries than with less bigger ones when it comes to quads, anything that flies really suffers to some degree from "rocket equation" more fuel need to lift = more fuel spent lifting fuel.

 

[Nyraised1]

Thanks, the battery looks about the same dimensions however. I have run 2 of the 7.4v 2700 nah 10c batteries together to get a longer flight time but it did suffer in performance. I'm just looking to get a little longer flight and maybe a performance boost. Do you have any recommendations on a size of battery that work be a good upgrade? I really appreciate all the answers from you guys. It really helps, I just am not crazy over those cheap OEM batteries that seem to swell up after a few chargers using the B6 charger.