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Step 6.

 

  Check to make sure all 4 standoffs needed for re-mounting your control board are in place. If 

they aren’t, install them. Now, remove (and set aside) the (2) #4-40 screws and nuts that are 

closest to the bottom edge of the chassis, as shown in Figure 3 (a).   

 

Step 7.

 

  Remove the (2) pan head screws that are closest to the top of the chassis and replace them 

with the (2) ½” flathead screws included with your Li-ion kit, as shown in Figure 3 (b). The 

flathead screws should be installed with screw-heads facing the inside of the chassis and the 

nuts attached on the outside. 

Note: If your robot uses encoders, it may be easier to 

remove them in order to perform this step, though it should not be required.  If you 

remove them, don’t forget to re-attach them before continuing on to Step 8; once 

the Li-ion pack is installed some mounting holes become inaccessible.

 

 

 

 

Figure 3 – Prepare the Servo Screws

 

 
  

 

(a) 

(b) 

Small robot chassis, upside-down, side-view 

Remove these 

screws and nuts 

from each servo. 

Small robot chassis, upside-down, wheels removed 

Top of chassis 

On both servos, remove the pan head screws near 

the top of the chassis. Insert the ½” flathead 

screws, with screw-heads facing inside the chassis. 

Tighten in place with nuts. 

Copyright © Parallax Inc.

 

 

Li-ion Small Robot Power Pack-Charger (#28988) 

 v1.2  3/3/2015  Page 5 of 10 

Summary of Contents for 28988

Page 1: ...ation 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 positi...

Page 2: ...all Phillips screwdriver Needle nose pliers Multi meter VOM Assembly Instructions CAUTION Do not install the Li ion cells until you reach the appropriate step Step 1 If installing on a Boe Bot robot s...

Page 3: ...the chassis then disconnect your control board Leave in place the 4 standoffs your board was mounted on Figure 1 Figure 1 Remove Control Board Step 4 Remove the two drive wheels and the tail wheel bal...

Page 4: ...Pack a b Remove the 4 cell battery pack by loosening these two screws Remove the 5 cell battery pack by loosening these two screws Copyright Parallax Inc Li ion Small Robot Power Pack Charger 28988 v1...

Page 5: ...the outside Note If your robot uses encoders it may be easier to remove them in order to perform this step though it should not be required If you remove them don t forget to re attach them before con...

Page 6: ...rt the Li ion Power Pack at a slight angle into the chassis as shown Figure 5 a Insert the board so as not to crimp the servo cables Use 3 4 40 x pan head screws to attach the Li ion Power Pack to the...

Page 7: ...ervo screws closest to the Li ion pack should be installed with screw heads facing inward and the nuts attached on the outside of the chassis see Figure 5 b Step 12 Re attach the drive wheels and tail...

Page 8: ...to gently pry them out Lithium cells come pre charged so treat them carefully they already contain a significant amount of energy Handle with care and do not short the terminals Step 14 Re mount your...

Page 9: ...in the following a Cell charging circuits are disabled and Status indicator LEDs are disabled b The cells are electrically connected into a series configuration c Cell Power Output jack is connected...

Page 10: ...to the board to see if the condition persists Blinking The temperature of the cell is outside the safe charging zone The safe charging zone is typically set for between 32 and 113 F 0 to 45 C Off The...

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