Welcome Visitor! Please take a few seconds and New battery may have a shorting cell and self discharging when engine is off.
14.7v just after starting is correct, it should drop to 13.5-13.8v after a few minutes.
Old battery is toast, it can hold voltage but no Amps.
Batteries store power via chemical reactions, each time battery power is used some of the chemicals are used up, and never come back, which is why batteries, any batteries, "wear out" over time and use.
There is no such thing as a "rechargeable" battery, you can "re-energize" some batteries, but material or chemicals are used up when using them so they never come back to original state and over time they simply have too little material/chemicals left to hold power.
"Rechargeable" is just the word used for marketing, semantics, lol, and a moot point really, just FYI.
14.7v just after starting is correct, it should drop to 13.5-13.8v after a few minutes.
Old battery is toast, it can hold voltage but no Amps.
Batteries store power via chemical reactions, each time battery power is used some of the chemicals are used up, and never come back, which is why batteries, any batteries, "wear out" over time and use.
There is no such thing as a "rechargeable" battery, you can "re-energize" some batteries, but material or chemicals are used up when using them so they never come back to original state and over time they simply have too little material/chemicals left to hold power.
"Rechargeable" is just the word used for marketing, semantics, lol, and a moot point really, just FYI.
