This is a reply I got from Line 6 support on the future firmware updates on the battery capacity:
Thanks for the reply. There will be no further firmware released to change battery capacity with Relay G10. It was previously that a new transmitter should provide 8 hours of playtime on a full charge; now it will be 6 hours, and proportionally similar increments should be seen with older or frequently used batteries, respectively. That is a lasting change in the product functionality due to the resolution of the potential overheating hazard. If you feel the unit is failing beyond this change, then you should contact the distributor once again, for warranty options.
Kind regards,
Jason-Line 6 support
