Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 Li-ion Power Pack / Charger 2 Cell ( 28986) The Li-Ion Power Pack-Charger 2 Cell is an integrated storage cell and charging system on a single 3 x 4 printed circuit board. Compatible with most 18650-size Li-ion cells, the total power output capability of the system is approximately 1420 watt/hours, depending on the capacity of cells you choose. Although this Power-Pack/Charger is compatible with both protected and unprotected Li-ion 18650 cells, Parallax highly recommends using the protected types, such as Parallax part 28987. Features PCB-mounted cell holders with on-board charging circuitry Multiple power input/output options On-board output fuse protection Nominal 7.4 VDC output 8.2 VDC maximum Standard 3 x 4 PCB footprint integrates well with the Board of Education ( 28150), Propeller Proto Board ( 32212), or any application needing a reliable power supply with an integrated charging system Automatic charge/discharge switching circuitry Holds two rechargeable 3.7 volt Li-ion 18650-size cells Multiple LED indicators provide charge readiness information for each individual cell a status key for the LED indicators is printed on the board. Aggressive holders retain cells in any board orientation and in moderate shock environments, such as mobile robotic applications. Cells are not permanent, and can be replaced. Dedicated circuitry continuously monitors the charging process to ensure safety, efficiency, and to maximize the number of charge/discharge cycles of each cell. Key Specifications Charging Power Requirements: +512 VDC 1amp (min.) 2.1 mm barrel jack, center positive supply ( 750-00009 works well) Power Output: Unregulated nominal 7.4 VDC 18002600 mAh (depending on cells used) Dimensions: 3.0 x 4.0 x 1.0 in 7.6 x 10.2 x 2.54 cm Charging Time: 1 6 hrs or more, depending upon the discharge level and capacity of the cells Application Ideas Portable power for data-logging applications Mobile robots Standby power / automatic power-switching Automatic charging circuits Stackable auxiliary power solutions Boe-Bot / Board of Education / Propeller Proto Board Auxiliary Power Supplies Stingray Robot ( 28980) battery pack upgrade Copyright Parallax Inc. 28986 Li-ion Power-Pack/Charger 2 Cell v1.0 6/21/2011 Page 1 of 7 Packing List (1) Li-ion Power-Pack / Charger 2 Cell PCB, 3 x 4 (1) Li-ion Battery Cable ( 802-00020) (2) 2-amp fuses 1 pre-installed, 1 spare ( 452-00065) (4) Black dome rubber feet ( 700-00087) (4) Clear square rubber feet ( 700-00037) Additional Items Required (2) Li-ion 18650-size cells ( 28987 or equivalent) +5 to +12 VDC power supply, center positive, 2.1 mm barrel jack ( 750-00009 or equiv.) Safety glasses Multi-meter (VOM) Assembly Instructions CAUTION: Before inserting the cells into the holder, two sets of rubber feet must be applied to the correct places on the bottom of the PCB, following the steps below. Aside from applying the rubber feet and installing the cells into the holders, the PCB itself comes fully assembled and tested. Lithium cells come pre-charged (to some extent), so treat them carefullythey already contain a significant amount of energy. Handle with care and do not short the terminals Step 1: Turn the PCB over so that its oriented as shown in Figure 1 below. Figure 1 Step 2: Place a clear flat rubber foot over each of the (4) soldered cell terminals as shown in Figure 1. These feet protect the cell holder terminals from being accidentally shorted. Remember: Li-ion cells have a lot of stored energy and rapid discharge can result in an unsafe condition. Even though the output of the board is fuse protected, direct shorting of these solder points is not within the fused portion of the circuit. Copyright Parallax Inc. 28986 Li-ion Power-Pack/Charger 2 Cell v1.0 6/21/2011 Page 2 of 7