Did a lot of digging on CRICKET'S website.The phone itself is under warranty for one year.Nothing that I read excluded the battery from that warranty(I may have missed something,as this warranty is buried in the fine print on their website),however,I suspect that the battery is not covered.
A phone call to the point of sale/CRICKET/METRO,or even HUAWEI may be in order to further investigate whether the battery is covered under the same warranty as the phone itself.
BTW,did you buy your phone new,directly from CRICKET/METRO PCS,or,a 3rd party dealer,or,used via a private seller?This may also affect the validity of the warranty.Most of the time,the original warranty is not transferable,however,the law on this varies from state to state.
Either way,if you can't find a dealer nearby who has a battery that you can troubleshoot with,or,an ASCEND that you could troubleshoot your chargers with,I'd go w/Gmash's suggestion & get an inexpensive battery from AMAZON or e-Bay to troubleshoot with.The reputable sellers have a decent return policy,if the battery is not the problem,as long as you return it w/the original packaging intact as best as possible.