Joshua F Thomas
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If you're using the 3.7v, you'll have to choose between 3 in series ( = 11.1 v ) or 4 in series ( = 14.8 v ). How useful any of these are depends on the wiring you're using and the length of your launch cord. If you have a really long cord from the batteries to the pad, use the higher voltage.
My suggestion is to get a battery holder and build that into your kit. Take a look at this: https://www.ebay.com/itm/26650-Dual...-2-pcs-Brass-SMD-clip-US-Seller-/132490043800
Those are for 26650 sized cells; choose a holder for the correct size. Perhaps Battery Bill has something appropriate? In my controller, those holders are superglued to the bottom of the case. 14g wire is soldered between the terminals to put them all into series. To recharge, just remove the batteries and put them in your charger.
The 3500mAh are more than sufficient. You need peak discharge, not total capacity. Look for the CDR rating of the battery. 10A is what you want minimum. 15A is better, and beyond that is overkill unless you're going for large cluster launches.
My suggestion is to get a battery holder and build that into your kit. Take a look at this: https://www.ebay.com/itm/26650-Dual...-2-pcs-Brass-SMD-clip-US-Seller-/132490043800
Those are for 26650 sized cells; choose a holder for the correct size. Perhaps Battery Bill has something appropriate? In my controller, those holders are superglued to the bottom of the case. 14g wire is soldered between the terminals to put them all into series. To recharge, just remove the batteries and put them in your charger.
The 3500mAh are more than sufficient. You need peak discharge, not total capacity. Look for the CDR rating of the battery. 10A is what you want minimum. 15A is better, and beyond that is overkill unless you're going for large cluster launches.