So many of these Asian made AGM batteries, even if the case is of a different color, weigh exactly the same.
With no proof, I offer that they are all the same internally and only marketed differently, perhaps put in a different color case with different color cap.
These AGM batteries almostuniversally say, in cyclic use, meaning deep cycle use, to bring the voltage upto 14.5 to 14.9v with upto a 30% charge rate.
So a 12AH AGM should be fed upto 4 amps intiially, and then once 14.5 to 14.9v is achieved, hold that voltage until amperage tapers either to 0.06 amps, or until it stops tapering and amperage begins to rise when held at constant voltage in the mid to high 14's.
MOst chargers for such batteries are just a constant voltage charger, usually 13.8v, and can only make a fraction of this 30% charge rate.
Despite what will be has been repeated ad naseum about batteries, AGMS are tickled to a premature demise when they are deeply cycled, and never fed larger charge rates.
Partial state of charge cycling, means that the battery begins its next deep discharge cycle before it was fully recharged.
EVERY lead acid battery is damaged by this PSOC cycling. The more PSOC cycles accumulated, the longer it will then take to truly fully charge the battery, and the more important it becomes to actually approach that 30% 'maximum' charge rate listed on the side of the battery. not only does this higher initial amperage become more important as the battery ages and is subjected to abuse, but the achieving of an actual true full charge becomes more important. The last 20% of charge always takes no less than 3.5 hours, but the more PSOC cycles the longer this last 20% takes to achieve, at voltages in the mid 14's and the final 10% likely never ever will occur if not brought and held in the mid 14s on a more aged battery.
So one battery might have lived a longer life than another simply as it was plugged in to charge earlier after a discharge and left charging for longer, even on an inadequate charger. The battery brand might have absolutely nothing to do with its lifespan, and the habits of who plugs in to recharge it are fully responsible.
This is always overlooked on battery threads on Bitog, and the longevity is somehow only dependent on the marketing and sticker and manufacturer, rather than how the battery was treated.
Most people have Zero Idea about state of charge/ state of health, and a battery is likely 'still going strong', the day before it ' fails to hold a charge'.
The chargers which come with most of these devices do not even come close to the 30% that AGMS like to receive when well depleted, nor do they achieve and hold mid 14 volts for the duration required to indeed truly fully charge them. They are usually just single voltage 13.8v chargers ( for a 12v battery) with 2 or 3 amps max available available to achieve that 13.8v. This is ONLY adequate for shallow cycles when the battery is still relatively new. It is a death sentence for an AGM drained to 30% state of charge or less. each cycle.
I have lots of experience cycling 18 and 22Ah Asian made UB/UPG AGMS. They can easily accept much higher amperage than their label states is the maximum, and are better off for it. The danger is overheating them. I will allow them to feed on as much amperage as they want for about 5 minutes, then back off and double their recommended rate . The 22Ah battery drained to 11.2v put on a 100 amp adjustable voltage power supply peaks at 64 amps, tapers to 52 amps in less than a minute and 5 minutes later is still accepting over 35 amps. It says 6.6 samps max on its side. At this point I usually back off the voltage until only 12 to 13 amps flow, which is about double the recommended rate, and then bump up voltage in stages to keep this rate, until 14.7 v is reached at battery terminals. Battery usually heats by 10F during this. about 4 more hours held at 14.5 to 14.7v is required for amps to stop tapering. If amps start rising again at constant voltage, I remove them from charger.
This hands on approach is obviously not possible or desirable for everyone. I bring it up as an example, that the batteries can and will accept much higher charging rates than their 'recommended' maximums. I exceed those maximums by a factor of 5 or more. No mushroom clouds and the batteries still perform well in voltage retention department and deliver much of their original rated capacity.
They would not if I had a single voltage 2 amp wall wart. Now will some AGMS behave better than others when fed unideal charging voltages and initial amperage rates.?...Likely so, but when they are plugged in, and how long they are plugged in, and at what level they are discharged to, still play a much bigger part in their lifespans, than one brand over another.
But in the Bitog way regarding batteries, its all about brand fanboism, and bragging rights and 'still going strong' till the day it dies, with No data or facts involved.
If there was as much mis/poor/flat out wrong information regarding lubrication on Bitog, as there is regarding Lead acid battery charging, then believe little to nothing you read.
If you want scooter batteries to live longer, how you treat them regarding depth of discharge and how quickly they are plugged in to recharge, and for how long, will have 3x more effect than who printed their label on the side of the battery.
Those seeking maximum longevity would know the voltages the charger is bring the batteries to and with how much amperage initially, and if it is more than a single voltage charger, how long it holds the higher voltage.
No Data? then present no facts/opinions. Without any reports as to how one battery was treated versus another, then reports of battery longevity good or bad are nearly entirely meaningless.
