Slightly OT: New PC925 battery not getting to full charge Options

[Literati914]

Couple days ago I picked up two new Odyssey PC925 batteries from a marketplace seller who was supposedly selling them for his dad. The story was that his dad bought them for a couple of electric bike builds and they were too heavy. Dad chose something else after only opening and trying one of them (one was unboxed and one had never been opened when I purchased). So they sat for 4-5 months, his dad said 'get whatever you can for them'. The seller had them at $200 a piece, before dropping them to $100 each - which is what I bought them for.

The one that was already opened was only showing like 7V so I put it on a little charger I already had (not necessarily the recommended type, that I'll need to purchase I guess). I kept a watch on it so it did not over charge.. but I finally took it off the charger when it reached 12.25V or so (took a long time tbh). I installed it in a 2.5L Volvo wagon (will be going in 914s eventually), it showed 14.3-4v, so I did a 20+ mile loop on the freeway to finish topping it off. I did not check it as soon as I returned but about and hour after the drive, it's still only showing like 12.15V. Is this just a bad battery or need more (proper) charging?

[Jack Standz]

Optima makes their own charger/maintainer that seems to be optimized for their AGM batteries. It's kept the red top in my 914 working for many years including months without driving during the winter.
https://www.amazon.com/dp/B00DHGPVKI?ref_=p...itle_5&th=1

Also really like Optima products. Have used this exact same charger for years and it always does the job.

It is a little unusual how you select the type of battery, but the charger starts with testing the battery (state of charge and type) then adjusts volts and amps throughout the charging process.