My night light battery is knackered, so I want to sort an alternative.
The light runs on 12v.
I have several 11.1 v 800mah batteries normally used to power airsoft guns.
I’m happy that the voltage is ok, tried it and the light is pretty much as bright as before. 800mah seems a bit low to get a decent runtime though so if I wire them both in parallel (pos to pos & neg to neg) will that effectively double the mah but leave the voltage the same?

yep.
11.1V? how many cells?

Wrong thread..

It’s a 3 cell LiPo, each cell is 3.7v.

hmm. i’d be a bit leary if it were me. those packs are a bit pricey and i don’t know a great deal about them. you can get a high mah nimh pack and simple charger for not much. i’d go that route tbh, or just cheapy chinese.
edit: i’m sure they’re protected but i’d be concerned about balance between the two packs.

i’m sure they’re protected but i’d be concerned about balance between the two packs.

That certainly isn’t an issue if you’re connecting them in parallel – they’ll self balance.

oh! of course! 😳
^ that