放过电的蓄电池应及时充电，随着充电进行，电池两极的放电生成物PbSO4与电解液中H2SO4发生反应将两极完全充电后，把原先放电时消耗的H2SO4又复返回，因此电解液中H2SO4浓度越来越浓，达到放电前电解液中H2SO4的浓度。
充电过程，电解液中H2SO4相对密度会变化，理论上和放电时电解液相对密度变化相反，伴随着充电进行，电解液中的水会在充电反应中消耗，硫酸的生成与充电量成比例，即消耗0.672g/A·h水，生成3.6579/A﹒h 硫酸，生成的硫酸在电解液里快速扩散达到浓度均一，充电量与电解液相对密度变化的关系类似于放电量与电解液相对密度变化的关系。实际上，因充电而产生的H2SO4。会在极群间滞留，由极群内扩散至电解液里比较慢，充电结束前．电解液中H2SO4浓度不可能很均匀，正好这时充电末期会发生水的电解产生气体，气体从电解液中逸出，起着搅拌作用，电解液中H2SO4。的均匀性会改善，这时测得的相对密度可作为充电结束的一个指标来判断是否还要充电。
The storage battery that passes an electricity should refresh in time, along with refresh to carry on, in battery two turning on electricity of poleses born thing PbSO4 and electrolyte the H2 SO4 occurrence reaction two after very and completely refreshing, again returned the H2 SO4 turning on electricity depletion at first, therefore the H2 SO4 densitieses in the electrolyte are more and more thick, attain before turning on electricity electrolyte in the density of H2 SO4.
Refresh process, the H2 SO4 opposite density will change in the electrolyte, theoretically and turn on electricity electrolyte the opposite density change contrary, accompany with and refresh and carry on, water in the electrolyte will be refreshing and consuming in the reaction, sulfuric acid of born with refresh and measure into a proportion, then consume a 0.672 gs|A ·h water, born 3.6579| h sulfuric acid of A ﹒ , the born sulfuric acid quickly spreads and attains a density in the electrolyte uniform, refresh and measure and electrolyte the opposite density change of relation similar in turn on electricity and measure and electrolyte the opposite density change of relation.Actually, because of refresh but produce of H2 SO4.Meeting at pole cluster be detained, from spread into electrolyte slower inside the cluster very much, before refreshing be over.the H2 SO4 densitieses in the electrolyte are impossibly very even, at the right moment at this time refresh will take place in last phase the aqueous electrolysis creation air, the air diverts from the electrolyte and mixs blend a function, in the electrolyte H2 SO4.Of the even will improve and measure at this time of the opposite density can be an index sign that refreshes be over to judge whether still need to refresh.
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