Replacing lead acid batteries in an electric bike battery pack.
Several years ago I replaced the batteries in my ex's bike, when I dismantled what I assumed to be the battery pack in it's original state it contained six 6v (16ah if I recall correctly) batteries, I bought identical batteries & wired them into the box exactly as it had been before & unsurprisingly it worked perfectly.
The bike is now mine and as I said that was several years ago, the bike has seen a lot of use since & the pack has been discharged & recharged sometimes several times a week ever since, the bike is now lacking power, hills it used to climb with ease are now becoming a struggle & the bike is generally not as fast as it use to be so I have been looking around for another set of batteries planning to replace them once again.
When I started looking around the web for suitable replacements for my model of bike every site I found with deals for a battery set lists not six 6v but three 12v, dimension wise they are not a problem as the three batteries will fit quite nicely into the box but I have to admit I was a little surprised.
I will be honest I'm not as well versed on things like electric bikes as I would like to be & frankly the whole thing is a bit of a mystery to me, ask me for a table a workbench a garden swing or a shed & I'm your man, I can rebuild computers & set up networks without a problem and there are plenty of other things that I'm very good at but with this stuff I need advice.
My question is simply this, is there any advantage or disadvantage for that matter to using three 12v 15Ah rather than six 6v 16ah batteries.
I would prefer answers in plain simple layman's terms rather than lots of technical jargon, if it helps the bike is a Thompson Euro Classic with a 36v lead acid battery pack and rear hub motor, admittedly a bit of a dinosaur in electric bike terms but it still gets me around well enough I'd just like to get a bit more power out of it.
Thanks in advance for any help.