From a safety point of view, lead-acid batteries do not exist organic electrolyte, generally will not occur fire explosion accidents;  However, lithium batteries have a certain sealed space and contain organic matter, which may cause fire and explosion in the case of incorrect use.  Therefore, lead-acid batteries are better than lithium batteries in terms of safety.  

In terms of energy density, a kilogram of lithium battery contains three to four times as much energy as a kilogram of lead-acid battery.  That means lithium-ion batteries can go farther than lead-acid batteries for the same weight.  Therefore, lithium batteries are superior to lead-acid batteries in terms of energy density.  

From the point of view of service life, a group of good quality lithium battery, cycle times can reach about 1000 times, lead-acid battery is only about one-third of lithium battery.   Therefore, the service life of lithium batteries is better than lead-acid batteries.  

The picture  

Luyuan Lithium tram -ZBH seagull  

In addition, according to different materials, lithium batteries can also be divided into lithium iron phosphate battery, three lithium battery, lithium manganese acid battery.   Different materials of lithium batteries have different characteristics, which can be summarized as follows:  

Safety: lithium iron phosphate > lithium manganate > ternary lithium;  

Life: lithium iron phosphate > lithium ternary > lithium manganate;  

Capacity: ternary lithium > lithium iron phosphate > lithium manganate;  

Price: lithium iron phosphate > ternary lithium > lithium manganese acid.  

Therefore, both lead-acid batteries and lithium batteries, or lithium batteries of different materials, have their own advantages and disadvantages, we can not simply use "good" or "bad" to define.