On Wednesday, February 25, 2015 at 3:51:09 PM UTC-8, Dan Marotta wrote:
I'm considering replacing the lead-acid tail battery in my LAK-17a
with NiMH batteries.* I find D cells rated at 1.2v 10 Ah which would
be ideal to build up a 12v 10 Ah pack.* I've already checked fitment
in the sealed battery box using alkaline D cells.



Can anyone tell me if these batteries are actually 1.2v.* If so, I'd
need to use 11 or 12 of them to get the voltage I want.


--

Dan Marotta

Bad choice: compared to other options the have poor energy density, poor charge performance, can represent a higher fire hazard, require a specific type charger. You should not try to fast charge a NiMh pack in an enclosed space, especially without a thermal monitoring charger/cutoff. There is just much better battery technology available. Especially LiFePO2 batteries.

I am also aware of a glider NiMh battery with serious thermal damage caused by improper charging/insufficient manufacturer warnings, etc.