# Lithium ion alternative to D type battery

#### spagettilegs

Joined Sep 11, 2019
10
I have a machine that uses 6x D type battery’s which lasts a few hours of constant use. From what I can see online each battery is a 1.5v producing 20,000 mah.
I’m exploring the idea of using a lithium ion battery as an alternative to get a greater duration.
Would anyone know if this is a viable alternative and what specs should I be looking for in a lithium ion battery if it is a more practical option?

many thanks

#### Papabravo

Joined Feb 24, 2006
16,830

#### Audioguru again

Joined Oct 21, 2019
3,544
An old Name-Brand D size alkaline cell was 8000mAh. Some new ones have a little C cell inside for 5000mAh. Super Heavy Duty ones from ebay are 1000mAh if you are lucky. Who says 20,000mAh, ebay or when they are lightly loaded by a smoke detector??

A Li-PO battery is destroyed if you let its voltage drop below about 2.5V - 3V per cell (2 cells produce 8.4V max, 3 cells produce 12.6V max) and might explode if charging is attempted. They and their chargers are sold in local hobby stores. They are expensive.

Walmart.com has sellers (like ebay) where two Energizer D alkaline cells cost the same as twelve of them and with free delivery.
They do not say how old they are.