Here is what my app shows. Should it be higher?
View attachment 3861471
According to the link from Interstate:
"Standard batteries need more voltage than AGM batteries to recharge because regular batteries have higher internal resistance. To keep them from overheating, they can only take a few amps at a time at that high voltage.
This means AGM batteries need a special AGM charger. They can take a lot of amps in a short period of time — but an AGM battery charger must keep its voltage lower than 14 volts to avoid ruining the AGM battery. AGM batteries are 12 volts, like all car batteries, and can handle some higher voltage, but only up to a certain point. If a car alternator charges an AGM battery with a voltage higher than 15 volts, it can damage an AGM. It’s not likely, but voltage fluctuations are a possibility."
According to Odyssey Batteries for their AGMs:
"
Q. What are the required charging voltages?"
"
A. If the battery is used in a starting application, the alternator should provide between 14.2 and 14.5 volts at the battery terminals. In cycling applications, the absorb voltage should be between 14.4 and 14.8 volts, while the float setting (if applicable) should be between 13.5 and 13.8 volts."
According to Optima Batteries:
"
OPTIMA YELLOWTOP® CHARGING INFORMATION
The following charging methods are recommended to ensure a long battery life. Always use a voltage-regulated charger, with voltage limits set as described below.
YELLOWTOP Type: D51 & D51R - D35 – DS46B24R - D75/25 - D34 – D34/78 - D27F - DH5 - DH6 - DH7
These batteries are dual-purpose. They are designed for engine start and cyclic applications and for use in vehicles with large accessory loads.
Recommended charging information:
- Alternator:
- 13.65 to 15.0 volts, no amperage limit.
- Battery Charger:
- 13.8 to 15.0 volts, 10 amps maximum, for approximately six to twelve hours.
- Cyclic Applications:
- 14.7 volts, no current limit as long as battery temperature remains below 125°F (51.7°C). When current falls below one amp, finish with two-amp constant current for one hour.
- Rapid Recharge:
- Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below one amp.
- Float Charge:
- 13.2 to 13.8 volts, one amp maximum current, time indefinite (at lower voltage).
- Strictly adhere to all limits.
YELLOWTOP Type: D31A & D31T
These batteries are dual-purpose. They are designed for engine start and deep-cycle applications for use in vehicles with large accessory loads.
Recommended charging information:
- Alternator:
- 13.65 to 15.0 volts, no amperage limit.
- Battery Charger:
- 13.8 to 15.0 volts, 10 amps maximum, for approximately six to twelve hours.
- Cyclic Applications:
- 14.7 volts, no current limit as long as battery temperature remains below 125°F (51.7°C). When current falls below one amp, finish with three-amp constant current for one hour.
- Rapid Recharge:
- Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below one amp.
- Float Charge:
- 13.2 to 13.8 volts, one amp maximum current, time indefinite (at lower voltage).
- Strictly adhere to all limits.
OPTIMA BLUETOP® CHARGING INFORMATION
The following charging methods are recommended to ensure a long battery life. Always use a voltage-regulated charger, with voltage limits set as described below.
BLUETOP Type: 34M
These batteries are designed for engine starting applications. They are NOT recommended or warranted for use in deep-cycle applications.
Recommended charging information:
- Alternator:
- 13.3 to 15.0 volts, no amperage limit.
- Battery Charger:
- 13.8 to 15.0 volts, 10 amps maximum, for approximately six to twelve hours.
- Rapid Recharge:
- Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below one amp.
- Float Charge:
- 13.2 to 13.8 volts, one amp maximum current, time indefinite (at lower voltage).
- Strictly adhere to all limits.
BLUETOP Type: D34M / D31M/ D27M
These batteries are dual-purpose. They are designed for engine starting and deep-cycling applications, as well as for use in boats with large accessory loads.
Recommended charging information:
- Alternator:
- 13.65 to 15.0 volts, no amperage limit.
Battery Charger:
- 13.8 to 15.0 volts, 10 amps maximum, for approximately six to twelve hours.
- Cyclic Applications:
- 14.7 volts, no current limit as long as battery temperature remains below 125°F (51.7°C). When current falls below one amp, finish with two-amp constant current for one hour for D34M, and three-amp constant current for one hour for D27M and D31M.
- Rapid Recharge:
- Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below one amp.
- Float Charge:
- 13.2 to 13.8 volts, one amp maximum current, time indefinite (at lower voltage).
- Strictly adhere to all limits.
OPTIMA REDTOP® CHARGING INFORMATION
The following charging methods are recommended to ensure a long battery life. Always use a voltage-regulated charger, with voltage limits set as described below.
REDTOP Type: 34 & 34R - 34/78 - 78 - 25 & 35 - 75/25
These batteries are designed for engine starting applications. They are NOT recommended or warranted for use in deep-cycle applications.
Recommended charging information:
- Alternator:
- 13.3 to 15.0 volts, no amperage limit.
- Battery Charger:
- 13.8 to 15.0 volts, 10 amps maximum, for approximately six to twelve hours.
- Rapid Recharge:
- Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below one amp.
- Float Charge:
- 13.2 to 13.8 volts, one amp maximum current, time indefinite (at lower voltage).
- Strictly adhere to all limits."
