Slipping into sleep mode can happen when storing a Li-ion pack in a discharged state for any length of time as self-discharge would gradually deplete the remaining charge.
Depending on the manufacturer, the protection circuit of a Li-ion cuts off
Once "woken-up" your battery will under go testing to make sure that all the cells are balanced and the pack charges & discharges correctly with no issues.
1) Purchase the battery recovery service and we will send you a pre-paid postage label.
Once we receive the item, we will recover, test it and ship it back to you.
2) You can bring the battery pack to us in person at our shop in Leeds (click here for directions).
3) If you want to ship the entire item to us, sure, please click here to book our Collect & Inspect repair service or select from the options below: