The specs for the Relion RB100 are at
https://relionbattery.com/products/lithium/rb100
50 amps charge rate is recommended, but there is no stated minimum current. The battery can accept up to 100 amps during charging.
It does need 14.4 to 14.6 volts for late stage final charging so older converter/chargers that provide 13.2 or 13.6 volts will not be suitable.
Any solar charger needs to provide 14.2 volts minimum. 14.5 volts would work better. A 100 watt solar panel provides 8 amps maximum at high noon on a clear day. The battery specs do not address such low charge rates. They say simply, 50 amps recommended. You may have to ask the company how the battery will charge at 8 amps and lower.
If the low rate of charge is efficient, one day of solar charging using a 100 watt panel would provide 60 amp hours, probably less. 8 hours at 8 amps = 64 amp hours.
This marginal performance is probably not enough for 7 days of dry camping. This is true for your existing lead acid battery as well.
A second panel would help a lot. A second battery (lead, or Lithium) with the one panel would help because you could start camping with 200 amp hours of capacity and break camp with possibly 20% reserve capacity.
I have a pair of 100 amp hour lead acid AGM Interstate batteries. We typically stay out dry camping for 5 days and break camp with more than 40% reserve capacity.
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