You should always use OEM battery in Mach-E, because of BMS. The stock battery is an H3 size, the battery tray has another set of holes to hold a larger H4 size battery, which will fit. However, a battery with a larger capacity will not play well with the BMS system. It expects a 35 Ah capacity AGM. The H4 battery is 33% larger, so the BMS will not be able accurately measure or utilize the extra capacity beyond 35 Ah. As a result, the larger battery may be chronically undercharged, causing early failure. In other words, it might make things worse, not better.
@ElementaryWatson-123 OEM battery wasn't available at the time and double the cost in the dealer. The owner requested a bigger battery, and with the information available and with past experience fitting bigger batteries to pretty much all other ford's that have BMS with 0 issues, i even upgraded the 700 amp efb on my car to a 800 amp agm almost 3 years ago with no issues at all, we also went with that as AGM 202 are not available aftermarket, sometimes you have to make a decision with what is available and what the customer wants. So time will tell
@@azerotha4531 the warning comes from Ford, not from me, you can do whatever you want. I just replaced my battery at the local Ford dealership, it's just $167 including labor and that includes 3 y warranty.
You should always use OEM battery in Mach-E, because of BMS. The stock battery is an H3 size, the battery tray has another set of holes to hold a larger H4 size battery, which will fit. However, a battery with a larger capacity will not play well with the BMS system. It expects a 35 Ah capacity AGM. The H4 battery is 33% larger, so the BMS will not be able accurately measure or utilize the extra capacity beyond 35 Ah. As a result, the larger battery may be chronically undercharged, causing early failure. In other words, it might make things worse, not better.
@ElementaryWatson-123 OEM battery wasn't available at the time and double the cost in the dealer. The owner requested a bigger battery, and with the information available and with past experience fitting bigger batteries to pretty much all other ford's that have BMS with 0 issues, i even upgraded the 700 amp efb on my car to a 800 amp agm almost 3 years ago with no issues at all, we also went with that as AGM 202 are not available aftermarket, sometimes you have to make a decision with what is available and what the customer wants. So time will tell
@@azerotha4531 the warning comes from Ford, not from me, you can do whatever you want. I just replaced my battery at the local Ford dealership, it's just $167 including labor and that includes 3 y warranty.
@ElementaryWatson-123 I'm in the UK less availability over here and most ford dealers here try to avoid these lol
Plus it's a 4 to 6 week wait to get in a dealer here even for a battery 🤣