Check the listing for details. ATOMIC Compact ESC Cap Pack 3-8S / 6,000uF Minimum / 35V / 8S Capable / USA. Color: Multi-Color, Condition: New. Listed at 21.95 USD. 3-8S Capacitor Pack Specifications 6,000µF MIN.Ultra Low ESR Ideal for 3-8S 8S Capable 35VDC MAX Genuine CapacitorsNichicon HE(M) Series or Rubycon ZLQ Series6,000-10,000 Hour Life (L)1.32in. x (W/H) 1.29in.(L) 33.5mm x (W/H) 32.8mmWeight 0.99oz (28g) Each individual pack is fully tested and the capacitance is recorded on the PCB Designed and Assembled in the United States The Problem-Voltage Ripple occurs when the current demand is greater than the batteries' ability to supply it. When this happens, the voltage supplied to the ESC will dip and the AMPs drawn by the ESC will spike causing damage to the ESC. In addition to damaging the ESC, the battery can also be stressed and overheat causing damage. Low quality (Low C Rating) batteries or low mAh batteries can increase the voltage ripple. Symptoms--Shortened life of ESC-Overheating of ESC and battery-Diminished ‘Punch’ when nailing the throttle The Solution-Capacitor Packs act as a rapidly chargeable and rapidly dischargeable secondary battery. Cap Packs instantly release stored energy when the ESC demands more power than the battery can supply. As soon as the demand is reduced below this threshold, the Cap Pack will instantly recharge ready for the next demand surge. Installation-Search ‘RC cap pack install’ on YouTube. There are dozens of instructional videos available. As the saying goes, a picture is worth a thousand words.