satisfy with the item
good product , 3 contact connected inside , positive , negative and NTC sensor. Is simple and effective , a source , and a charger , with 1 second positive pulse . Battery pack when you start , chargin need to have tension higher than 7,2 v after was discharged by usage . also need to be look for temperature o pack before charging . see instructions in the package . conclusion : simple schematics of charger , and very effective .