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Spare Rechargeable Lithium ion Batteries Only
3.6v same as 3.7v
Sanyo Brand come with circuit protector to prevent over voltage
Durability and good power performance of the persistence
Approximate life span: 1 year.
Ideal 3.6V batteries for 20 to 80 bulbs head LED light & Led night kites.
How long it can last? It's depends your number of bulbs on your kites.
Example: 4400mAh on 600bulbs Can last around 2-3hours.