/diy/ - Do It Yourself

>>1593130
Harbor Freight or Northern Tool or one of the other usual suspects will have small battery tenders for <$25. That may be the way to go. You can leave the tenders on indefinitely because lead acid batteries do well with the little trickle charge.

If you’re using a big old school charger for car batteries, yeah it’s probably too powerful and may not shut off at the right time.

Pic related works well for my small 4Ah scooter battery and can even charge a car battery (slowly) and goes on sale for $25 a lot. Charges at a fairly low current and goes into maintenance mode as soon as it gets up there in voltage. Only downside is the smart chargers don’t like to charge real flat batteries, it’s a protection thing so people aren’t forcing a battery with a dead cell or other charger, so make sure you don’t run that battery you have under 12.0V. Plus discharging so low isn’t good for a lead acid battery.

There’s a website called battery university that is super good at explaining anything you would want to know about charging and use.

https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery