This is the ElectriFly Balance Board for the DuraTrax Onyx 235 Charger. FEATURES: Allows 2S - 6S ElectriFly brand LiPo batteries to be properly balanced during charging process using the Onyx 235 INCLUDES: Balance Board with 2S - 6S Terminals and Balance Board to Charger Cable REQUIRES: Plugging cable into charger and plugging balance lead of battery into balance board COMMENTS: For the Duratrax Onyx 235 charger only. For the ElectriFly Balance Board used with the Onyx 245 charger, order DTXP4158.