- NO RETURNS ON BATTERIES
- JR-connector - 2X (3.5A each)
- XT30-connector (30A)
- Balance connector
This B2S2600 is a dedicated pack consisting of 2 LiIon cells arranged in a series configuration (two cells arranged side-by-side). Outputting 7.4VDC (nominal), this pack is intended for direct connection to receivers.
Representing a lot of juice in a compact package, this pack is equipped with two JST (JR-type) connectors rated at 3.5A each (combined they deliver 7A) along with an XT30 charge/discharge connector (rated at 30A). Plus, an HX-type balance connector for the charger (for monitoring SOC, or state of charge).
With regard to the leads themselves, we specced high strand count copper (20AWG for the DuPont leads and 16AWG for the XT30), both with supple silicone jackets. Everything is the good stuff, take my meaning? Anyway, what two DuPont connectors means to a savvy modeler is it makes it easy to deliver 7A to the receiver with no heat! And since receivers use a bus structure, you can connect the leads anywhere a servo draws power - yes, at any open channel.
This bit about no heat is important because the 3.5A rating for the connector isn't a limit. A single connector will let what the pack is capable of delivering go through it (18A in this instance). Of course, 18A only goes through it for a short period of time before it melts. Major point being, simply adding a second lead either instantly doubles how much current can be drawn from the pack, or it cuts the load going through each connector in half. Dual leads are a win-win from any angle.
Know why else two connections to the receiver are important? Because a model equipped with 6 modern servos is almost guaranteed to exceed 3.5A and begin to generate heat. Let's look at a bog standard DS180DLHV servo (specs below). Focus on the 6.6V column and note the stalled current is 2.7A - yes, just one servo all by itself can nearly devour what a connector is capable of delivering! And more powerful servos can draw even more.
Another reason two leads are better than one (and arguably, 'the' most important reason since servo loads are intermittent), is because having two connections also means you can use two switches from the pack instead of one. Why is this important? Simple, because if the switch fails, then the model crashes, right? So because the odds of two switches failing on the same flight are astronomical, then merely adding a 2nd $10 switch in parallel is the cheapest crash insurance money can buy!
Speaking of switches, once again, they're the best we can get made. They're rated at 5A, with 20AWG leads (about 6in on each side). The red one is for connecting a charger (when the switch is off).
SPECIFICATIONS
- Type: 2S (two cells in series)
- Capacity: 2600mAH
- Nominal voltage: 7.4V
- Full charge voltage: 8.4V
- Charge rate: 2C (full charge in 30 minutes)
- Continuous discharge rate: 10C
- Burst discharge rate (5-sec): 15C
- Continuous current: 50A (5.0x10=50A)
- Burst current (5-sec): 75A
- Weight: 211g (7.4oz)
- Dimensions: 67 x 53 x 26 mm (2-5/8 x 2-1/8 x 1 inches).
- Discharge connectors: JR-type (two) + XT30
- Balance connector: JST XH-type
