Thank you for pointing out the battery on the picture was 1300mAh, I had not even check that. The new battery doesn’t even have the capacity written on it.
I’ve already put the new battery in place. Before doing so, I weight the original and the new battery. The new battery weights ~39.05g and the old one ~38.9g , delta is ~ 1.15g. Hopefully that gram accounts for the additional +1700mAh (3Ah total).
I’ve put back the station on its pole. The station is reporting 2.50v.
I found on the net specs to float charge at 2.63 but another site says 2.80. To be safe I went with 2.63 but looking at the reported voltage, perhaps 2.8 would have been safe.
[edit] Per this comment, I should have used 2.8 to charge. At least solstice is behind us.