HP-41CL and 82120D Power Bank.

[Diego Diaz]

Hi all,

A user has referred me to this old (2011) thread.

Original poster is Geir Isene, and he proposed:
"...building a new battery pack using cell phone batteries, like stacking two of these or some such."

In msg. #16 Monte Dalrymple warned:
"The board is designed to accept 6V. Applying a higher voltage will reduce the lifetime."

Previously, in msg. #7 Garth Wilson had already noted that:
"It should be ok to exceed it a little. A brand-new alkaline is really more like 1.6V per cell, meaning 6.4V for four."

At first glace it seems to me that Monte's warning was referred to the fist post: stacking two Li-Ion batteries will rise 8.4v at full charge, which is by all means excessive.

But, since I designed the Power Bank to supply 6.3v, I'd like to confirm that this voltage (chosen on purpose to mimic a brand new set of alkalines) is safe enough to run a 41CL without compromising its life expectancy.

Any comments/insights are welcome.

All the best.

Diego.