When buying a battery charger, it's wise to read the amperage rate on the charger. For example, say we have a battery that reads 12v12a or a battery reading 12v14a. Note the amperage change.
How you now read the battery is to move the decimal point over one so now the amp reads 1.2a or 1.4a. So the formula reads, I charge the battery for 12 hours @ 1.2a. Here comes the problem choosing a charger. If say the tender is rated 1.2a, you install that onto a 1.4a battery, your amperage rate has dropped down to .2a. You'd want at least a charger that reads 1.5a, so this brings the 1.4 amp hour rated battery up to its full potential.
The next part is how to prep a new battery for service. If you read the instructions that comes with the battery, or I spoke to a Yuasa tech and he explained his company buys the competition's batteries, fills the battery and lets the acid soak into the plates for an hour or more; charges the battery to full capacity; drains the battery down to 1v and then charges the battery up to full; drains the battery two more times; then fully charge the battery one last time and is now ready for service.
I've done that procedure and it does create a stronger battery thru that chemical process. Google: 'Edison Battery' or youtube the same wording.
The last part is to use an electrical grease on the battery posts, nuts, bolts, and eyelets. I installed the battery without that step, found the ground cable corroded within a few years; caused a no-start condition until I found the cause; then started right back up when cleaned. If the cables are in bad shape or corroded; use a plastic cup; pour vinegar into the container; dip the cable posts into the vinegar; wait till the bubbles subside; use another container with fresh water; rinse; dry; coat with electrical grease as stated above.
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