GTL 18650 5000mAh (Blue)

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This is a very cheap battery ($10 for four, including shipping) with impossible specifications.

Official specifications:
GTL%2018650%205000mAh%20(Blue)-info

The capacity is nowhere near the specified 5000mAh, not even all batteries together is enough.

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GTL%2018650%205000mAh%20(Blue)-Capacity

The two batteries has slightly different capacity, but not that much.

GTL%2018650%205000mAh%20(Blue)-CapacityTimeHours

GTL%2018650%205000mAh%20(Blue)-CapacityTime

GTL%2018650%205000mAh%20(Blue)-Energy

GTL%2018650%205000mAh%20(Blue)-PowerLoadTime

GTL%2018650%205000mAh%20(Blue)-TripCurrent

This is interesting, they has very different current delivery capacity, i.e. it will be a very bad idea to use them in series with high power lights.

GTL%2018650%205000mAh%20(Blue)-Charge

With the low capacity they are very fast to charge.



Conclusion

The batteries is as expected: Not very useful and with the low capacity they are not even good value for the money.
With unknown and obvious low quality cells in a unprotected battery I will rate these batteries bad.



Notes and links

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries