Hi
I have an Xtar VC2, it seems to work well enough but I would like a charger that is capable of charging to 4V rather than 4.2V, with the intention being to charge to 4V after battery use, then top it off to 4.2V shortly before I need to use it. This is what modern macbooks do to prolong battery life.
Are there any good quality chargers that can set the target voltage?
Thanks,
Mark
IMHO, this low difference between 4.00V and 4.20V is quite negligible if you really aim to prolong battery life. You will have big difficulties finding a charger with fully selectable termination voltage. The only typical charger I know of is SkyRC‘s MC3000 (except for special chargers for R/C devices). The MC3000 however needs a certain learning curve and will not accept 21700 batteries, at least not conveniently.
My recommendation is:
Look for any charger that supports charging LiFePO₄ batteries. This setting will set the battery voltage to 3.7V which is considered the optimum voltage for storing batteries.
Storage isn’t what I’m looking for, I want to charge to 80% so they’re nearly ready to go and then just top off quickly before I need them.