registers:

# writing 0x10 in this register will generate an event
#   10 02 0Dxx yyzz00
# where 0D happens to be the battery register number
#       xx is the battery charge
#       yy, zz ?
<< (   0.001) [10 02 8100 000000] '\x10\x02\x81\x00\x00\x00\x00'
>> (   1.132) [10 02 8100 100000] '\x10\x02\x81\x00\x10\x00\x00'

# smooth scroll - possible values
#    - 00 (off)
#    - 02 ?, apparently off as well, default value at power-on
#    - 0x40 (on)
<< (   2.005) [10 02 8101 000000] '\x10\x02\x81\x01\x00\x00\x00'
>> (   2.052) [10 02 8101 020000] '\x10\x02\x81\x01\x02\x00\x00'

# battery status:  percentage full, ?, ?
<< (  14.835) [10 02 810D 000000] '\x10\x02\x81\r\x00\x00\x00'
>> (  14.847) [10 02 810D 644734] '\x10\x02\x81\rdG4'

# accepts mask 0xF1
# setting 0x10 turns off the movement events (but buttons still work)
<< ( 221.495) [10 02 81D0 000000] '\x10\x02\x81\xd0\x00\x00\x00'
>> ( 221.509) [10 02 81D0 000000] '\x10\x02\x81\xd0\x00\x00\x00'

# appears to be read-only?
<< ( 223.527) [10 02 81D2 000000] '\x10\x02\x81\xd2\x00\x00\x00'
>> ( 223.540) [10 02 81D2 000003] '\x10\x02\x81\xd2\x00\x00\x03'

# appears to be read-only?
<< ( 225.557) [10 02 81D4 000000] '\x10\x02\x81\xd4\x00\x00\x00'
>> ( 225.571) [10 02 81D4 000004] '\x10\x02\x81\xd4\x00\x00\x04'

# read-only, 01-04 firmware info
<< ( 259.270) [10 02 81F1 000000] '\x10\x02\x81\xf1\x00\x00\x00'
>> ( 259.283) [10 02 8F81 F10300] '\x10\x02\x8f\x81\xf1\x03\x00'

# writing 01 here will trigger an avalanche of events, most likely
# raw input from the mouse; disable by writing 00
<< ( 261.300) [10 02 81F3 000000] '\x10\x02\x81\xf3\x00\x00\x00'
>> ( 261.315) [10 02 81F3 000000] '\x10\x02\x81\xf3\x00\x00\x00'