1. Chemical properties of lead-acid batteries and cheapest 1.5-volt lithium batteries
In terms of mass energy density, the energy density of cheapest 1.5-volt lithium batteries is generally 200~260wh/g, and the lead-acid is generally 50~70wh/g. In terms of weight energy density, lithium batteries are 3 to 5 times that of lead-acid batteries, which means that under the same weight, the capacity of lithium batteries is three to five times larger than that of lead-acid batteries. Therefore, cheapest 1.5-volt lithium batteries have advantages in energy storage.
In terms of volumetric energy density, the volumetric capacity density of lithium batteries is usually about 1.5 times that of lead-acid batteries. That is to say, for two batteries of the same volume, the capacity of the lithium battery is 1.5 times that of the lead-acid battery.

2. Service life
A lead-acid battery usually has a lifespan of 300 to 350 cycles. Taking the common ternary lithium battery as an example, a lithium battery usually has a lifespan of 1000 cycles.
In terms of service life, cheapest 1.5-volt lithium batteries have an advantage.
3. In terms of price
Lead-acid batteries and cheapest 1.5-volt lithium batteries with the same capacity on the market, the price of cheapest 1.5-volt lithium batteries is about 2~3 times that of lead-acid batteries. In terms of price, lead-acid batteries have an advantage.