  Charged massive particles (CHAMPs), when present during the Big Bang
nucleosynthesis (BBN) era, may significantly alter the synthesis of light
elements when compared to a standard BBN scenario. This is due to the formation
of bound states with nuclei. This paper presents a detailed numerical and
analytical analysis of such CHAMP BBN. All reactions important for predicting
light-element yields are calculated within the Born approximation. Three
priorly neglected effects are treated in detail:(a) photodestruction of bound
states due to electromagnetic cascades induced by the CHAMP decay, (b)
late-time efficient destruction/production of H2, Li6, and Li7 due to reactions
on charge Z=1 nuclei bound to CHAMPs, and (c) CHAMP exchange between nuclei.
Each of these effects may induce orders-of-magnitude changes in the final
abundance yields. The study focusses on the impact of CHAMPs on a possible
simultaneous solution of the Li6 and Li7 problems. It is shown that a priorly
suggested simultaneous solution of the Li6 and Li7 problems for a relic
decaying at tau_x = 1000 sec is only very weakly dependent on the relic being
neutral or charged, unless its hadronic branching ratio is Bh << 10^-4 very
small. By use of a Monte-Carlo analysis it is shown that within CHAMP BBN the
existence of further parameter space for a simultaneous solution of the Li6 and
Li7 problem for long decay times tau_x > 10^6 sec seems possible but fairly
unlikely.
