From Profoto:
Unfortunately, we have discovered a potential safety issue with our new Li-Ion Battery MkII for B1 and B1X (product number 100399). We have therefore decided to execute a product recall for product number 100399 with manufacturing dates 2017-09 and 2017-16 (YYYY-WW).
Note that the recall only concerns the battery, but it affects all B1X kits and B1X batteries that you might have purchased. Please do not use your new B1X or your B1 with the new B1X batteries (product number 100399).
You can, however, use your B1X unit with the B1 battery (product number 100323).
If you have a battery affected by the recall, your local dealer will supply you with a B1 battery so that you can use your B1X in the meantime. Please contact your local dealer for information on how to replace your battery with a B1 battery.
Keep the battery still. Do not move or handle the battery. More information regarding how the handover of the recalled B1X batteries will be handled will be available soon.
If you have any further questions, do not hesitate to contact our local offices
We are very sorry about the inconvenience this may cause.
Sincerely,
Profoto AB
This is how you identify a B1X battery
The serial number label on the Li-Ion battery MkII for B1 and B1X (100399) is marked with "Date of manufacture”.
All batteries with Date of manufacture 2017-09 and 2017-16 are recalled. See example below.
The Li-Ion battery for B1 (100323) does not have any “Date of manufacture” marked on the serial number label. These batteries are not recalled, and they can be used with both B1 and B1X. See example below.