apak batteries offers high quality custom battery systems, from battery design to prototyping to battery manufacturing. our custom battery packs are used in aerospace applications, oem instrumentation, oceanographic applications, and as hobby batteries for high performance in remote control. our custom-designed battery packs are built to product specifications and electrical requirements. apak batteries is a vendor for the boeing company's loop resistance tester battery refurbishment and upgrade program. apak batteries responds promptly to bid requests available online.