Ok so I will be running a 12s1p and will be using a bms it is 44.4 volts there are three batteries 4s each 14.8v so which charger should I buy.
for 12s Lipo or Li-ion the full charge voltage is 50.4v you will need to match that with your charger. http://www.ebay.com/itm/50-4V-2A-Power-Adapter-For-Self-Balanced-Vehicle12S-Li-ion-Battery-Charger-Plug-/291922334252?hash=item43f7ed522c:g:WNsAAOSwo4pYD1ks
If current charging rate can go up to 10a should I try to max it out? or go to like 8?
I recommend charging at 1C. For Lipos that’s 1x amp hour or capacity. For Li-ions you’ll have to find out the cells charge rate and multiply by number of cells in parallel.