This is an optional Mini Peak AC wall charger from Losi.
The Mini Peak is an inexpensive AC quick
charger with peak detection safety for Ni-Cad and Ni-Mh battery packs.
The LOSB1206 Mini Peak AC Quick Charger plugs into any common 110v wall
outlet and will quick charge any 5 or 6 cell Losi Mini-T battery
pack in under an hour. After your pack has been safely charged with the
peak detection circuitry, the Mini Peak switches to a safe trickle
charge. The trickle charge allows the charged cells to equalize and
provide the maximum performance when driving your Mini-T. So, if you
hate the waiting and uncertainty of quick charging the Mini Peak AC
Quick Charger is for you.