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Li-ion Small Robot Power Pack-Charger (#28988)
The Li-ion Small Robot Power Pack-Charger is an integrated battery, power supply, and charging system
designed specifically to fit the Parallax small robot chassis (excludes the SumoBot Robot). It is intended
to replace the 4- or 5-cell AA battery pack that comes standard in the Boe-Bot, Shield-Bot, and
ActivityBot robot kits.
The Power Pack-Charger is powered by two 18650 Li-ion cells, providing approximately 7.4 VDC @ 2000
to 2600 mAh, depending on which cells you use. Parallax’s #28987 cells are rated at 2600 mAh, and
have built-in protections against over-discharging or excessive current conditions. This charger/power
pack will work with most protected and un-protected Li-ion 18650 cells.
Features
Fits into the small robot chassis, replacing the 4- or 5-cell AA battery pack
Holds two rechargeable/replaceable 3.7 volt Li-ion 18650 cells
Provides up to 6 hours of continuous motorized operation (depending on cell capacity)
Rechargeable Li-ion cells don’t need to be removed from your robot for recharging—charging
circuitry is built into the board.
Charge with a 7.5 VDC, 2.1 mm center-positive barrel jack wall transformer (Parallax part
#
750-00009, or equivalent).
Automatic charge/discharge switching circuitry and on-board output fuse protection
Multiple LED indicators provide charge readiness information for each individual cell; 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.
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: +5–12 VDC
@ 1 A (min.); 2.1 mm center positive barrel
jack supply (#750-00009 works well)
Power Output: Unregulated nominal 7.4 VDC
@ 1800–2600 mAh (depending on cells used)
Dimensions: 2.65 x 3.05 x 1.00 in
(7.6 x 10.2 x 2.54 cm)
Charging Time: 1 to 6 hours, depending
upon the discharge level and capacity of the
cells used
Application Ideas
Additional power for robot accessories
Extending your robot’s run-time
Copyright © Parallax Inc.
Li-ion Small Robot Power Pack-Charger (#28988)
v1.2 3/3/2015 Page 1 of 10
