40ah unit made with the same LTO cylindrical cells as the 80ah Unit.
These have less high end lug bars with the cases made of 1/4" all the way around.
These are rated with a stock alternator of 100a and 14.2V charging to hold low 13s on about 500a of draw. which is roughly 5kw clamped after efficiency. You'll obviously hold better voltage with more wattage with a larger alternator that charges 14.8+. Safe voltage range on these batteries is up to 16.2v reliably at cycled rates.
Recommended is a NOCO G series charger of 7.2a or more and an AGM+ setting so you can bring the battery to about 15.2-5v.
Dimensions are 9" Tall 9" Deep, 6" wide. They have 5 spot lug bars included.