Charging Telinga with alkaline battery

Dear Nature Recordists,

I have tried charging telinga pro 5 with Duracell Plus alkaline batteries
and found that accumulator voltage does not go beyond 4.4 Volt (from 3.5
,4.1 etc  initial voltage)or so . I have tried this with three new
batteries. So, I can only use Telinga with Duracell Battery remaining
attached while recording which is quite cumbersome and risky for
equipment.

I do not know whether there is problem with accumulator or batteries, or
it is the charging process which is wrong i.e. may be it should be charged
after fully discharging it. I request for advice from experienced Telinga
users and others.

Pratap Singh



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