Reversometer defective , fuse burns by , battery defective

hey maybe you can help me. I’ve been having the problem for some time now that my battery is too weak to start my kawa. now I’ve pushed the last 3 times the machine, that was also going pretty well. same situation yesterday, machine went on, ran a few meters and it formed smoke in the speedometer, machine went off. Following things that are broken,are known to me. -reality at the speedometer burned-through battery empty/weak/defect (no Annunciation) – 10 A fuse flies out, that’s in the security box the last Hab tried to charge the battery and put in a new fuse, immediately burned out again (speedometer currently developed. Would be great if one could help me lg FLo