每種電池充電的要求不同，主要在 bulk, absorption and floating電壓,電流和時間上。AGM仍是鉛酸電池但是封閉的 and electrolyte is held in the glass mats，好處是可任意位置安裝（直立，傾斜或倒立）。不清楚BMW，其它公司default setting是普通鉛酸電池。如果你用AGM電池，你要告訴電腦然後充電時就會以AGM所要求的profile充電。
to give you a high level concept about flooded (lead-acid), AMG and Gel, here is - flooded will have about 200 charge/discharge cycles, gel will have about 1000, AGM will have about 300. In the charge acceptance rate - flooded will be 25% of ah, gel will be 25% of ah and agm will be about 40% of ah. a flooded battery will self discharge at a rate of 6% per month if not on a charger, gel and agm will be about 3% per month. flooded vents hydrogen gas, gel and agm do not. price wise - a flooded dual-purpose battery will run about 120, a gel will run about 280 and an agm will run about 190. for longevity a gel cell is best, an agm is a good compromise between life span and safety. agm typically has a 18 month free replacement - 5 year pro-rated, gel - 18 month free, 5 year pro-rated; flooded - 12 month free, 3 years pro-rated.
above all, currently the best is lithium battery, an entirely different animal.
to give you a high level concept about flooded (lead-acid), AMG and Gel, here is - flooded will have about 200 charge/discharge cycles, gel will have about 1000, AGM will have about 300. In the charge acceptance rate - flooded will be 25% of ah, gel will be 25% of ah and agm will be about 40% of ah. a flooded battery will self discharge at a rate of 6% per month if not on a charger, gel and agm will be about 3% per month. flooded vents hydrogen gas, gel and agm do not. price wise - a flooded dual-purpose battery will run about 120, a gel will run about 280 and an agm will run about 190. for longevity a gel cell is best, an agm is a good compromise between life span and safety. agm typically has a 18 month free replacement - 5 year pro-rated, gel - 18 month free, 5 year pro-rated; flooded - 12 month free, 3 years pro-rated.
above all, currently the best is lithium battery, an entirely different animal.
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