The box series amplifiers were in production from 2009-2014. Those that shipped with internal rechargeable lithium-ion batteries are all near or at battery end-of-life.
Because shipping regulations have gotten more strict since these devices were produced, it is no longer legal to ship the lithium-ion batteries used. Therefore, I do not offer lithium-ion battery replacement. All box series amplifiers can be converted to run on NiMH battery packs instead, as follows:
littlebox/midbox/bigbox: A 6x 2/3 AA NiMH battery pack is a drop-in replacement for most littleboxes that previously had a lithium-ion pack. There is no circuit reconfiguration required. Some littleboxes with input or output transformers in the standard case size might not have sufficient internal room for the NiMH pack, which is slightly larger. The NiMH pack with mating connector is $20.
tinybox & tinyhead: any tinybox version can be reconfigured to use a 5x AAA NiMH pack. The cost of conversion (including new battery) is $50; a new battery pack is $20. The charger originally shipped with the tinybox must continue to be used with the NiMH pack.
PIPsqueak: all PIPsqueaks use a 4x 1/3 NiMH AA battery pack. A replacement pack including connector is $20. I have found that 1/3 NiMH AA batteries have variable initial charge capacity, which can cause premature pack death when the weak cell dies. Thus, I test each battery individually before I assemble the packs.
Is there a certain brand that you would recommend for the littlebox NiMH pack with mating connector. When I googled it way too many to choose from. Hoping you could narrow it down and send me in the right direction. So I’m sure I’m getting the proper pack. Thanks
The littlebox connector is a “Tamiya-style”connector. I don’t think Tamiya actually makes them anymore, but it’s a common part used by RC car battery packs, just do a Google search for “Tamiya connector”. They have gotten a bit hard to find at the big distributors since it’s an obsolete part, but I have a big bag of them so if you send me your mailing address I will send out some spares.
Incidentally, the tinybox/tinyhead/PIPsqueak connector is Molex 22-01-2025 and its pins are Molex 08-50-0032.
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