Replace 1 or all

[jjoediv]

I'm wondering if after checking batteries and finding 1 or more to be bad, can you replace just 1 or up to 3 or more. I;m guessing it's beat to replace a set or maybe the old will wreck the new! Any thoughts/advice?

[Sergio]

You really should replace all of them at the same time.

The next best thing (if You really have to) would be to replace single batteries with batteries of approximately the same age and usage as the ones left in the cart.

The issue is that the charger cannot charge individual batteries, so You end up with a situation where the "older" batteries cannot get up to voltage quick enough which causes the "newer" batteries to boil by overcharging.

[meangreenmachine72]

Replace them all ! I tried the other route on a cart and even know the others read fine I was replacing one every 3 weeks or so. Went with 6 new and couldn't be happier.

[Volt_Ampere]

Old and new batteries do not play well at all together! Replace them all. Only exception might be if you damage one on a fairly new set. Buying one at a time is not a good way to save your $$. Save up and buy them all together - and then take real good care of them.