Don't let your B battery get damp and don't let it freeze.
Don't try to recharge your B battery unless it is constructed for the purpose.
STORAGE BATTERY DON'TS
Don't connect a source of alternating current direct to your storage battery. You have to use a rectifier.
Don't connect the positive lead of the charging circuit with the negative terminal of your storage battery.
Don't let the electrolyte get lower than the tops of the plates of your storage battery.
Don't fail to look after the condition of your storage battery once in a while.
Don't buy a storage battery that gives less than 6 volts for heating the filament.
Don't fail to keep the specific gravity of the electrolyte of your storage battery between 1.225 and 1.300 Baume. This you can do with a hydrometer.
Don't fail to recharge your storage battery when the hydrometer shows that the specific gravity of the electrolyte is close to 1.225.