Answer:
The internal battery of the jump starter is NOT replaceable. However, there's no need to replace the internal battery. Before telling you what is the reason for that, it's better to clear about the following information for a better understanding:
General lithium battery’s lifespan:
 Typically, a modern lithium battery’s lifespan is 2~3 years, which is over 500 fully chargedischarge cycles as rated by manufacturers.
 This doesn't mean that your jump starter will die or won't work after 2~3 years. It means that after 300 to 500 full charge cycles, the actual battery capacity of the jump starter may drop by 20%, and the starting performance(Peak Current and Cranking Current) will decrease a little.
Here is the Cycle data of HULKMAN Alpha jump starters:
Model

Alpha 85

Alpha 85S

Alpha 100

Cycles

500 Times

500 Times

500 Times

Capacity Drop

20%

20%

20%

Thus, the battery capacity will drop about 20% after 500 fully recharge cycles. The lifespan of our products is totally long enough under normal use, which means there is no need to replace the internal battery.
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