Parallax 28988 Manual

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.
Web Site: www.parallax.com
Forums: forums.parallax.com
Sales: sales@parallax.com
Technical: support@parallax.com
Li-ion Small Robot Power Pack-Charger (#28988)
Office: (916) 624-8333
Fax: (916) 624-8003
Sales: (888) 512-1024
Tech Support: (888) 997-8267
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